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SubjectRe: [PATCH] airo driver: fix races, oops, etc..


On Thu, 7 Aug 2003, Jeff Garzik wrote:

> Javier Achirica wrote:
> > I've been studying the problem for a while and I've implemented a solution
> > using a single kernel thread and a wait queue for synchronization. I've
> > tested it and looks like it works fine. It can be used both in 2.4
> > and 2.6 kernels. Before submitting a patch with it I'd like someone with
> > experience in this kind of code to take a look at it just in case I'm
> > doing something dumb. Jeff? :-)
>
> Unless the patch is huge (100K or more), post it to linux-kernel, and CC
> it to me and Benjamin Herrenschmidt.

Here it goes. This version should be applied to the latest patches I sent
you in the 2.4 tree. Comments are welcome.

Thanks,
Javier Achirica
--- linux/drivers/net/wireless/airo.c.orig 2003-08-06 22:28:40 +0200
+++ linux/drivers/net/wireless/airo.c 2003-08-06 22:30:31 +0200
@@ -32,7 +32,6 @@
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/in.h>
-#include <linux/tqueue.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/bitops.h>
@@ -965,8 +964,6 @@
static void enable_interrupts(struct airo_info*);
static void disable_interrupts(struct airo_info*);
static u16 issuecommand(struct airo_info*, Cmd *pCmd, Resp *pRsp);
-static u16 sendcommand(struct airo_info *ai, Cmd *pCmd);
-static void completecommand(struct airo_info *ai, Resp *pRsp);
static int bap_setup(struct airo_info*, u16 rid, u16 offset, int whichbap);
static int aux_bap_read(struct airo_info*, u16 *pu16Dst, int bytelen,
int whichbap);
@@ -986,6 +983,8 @@

static void airo_interrupt( int irq, void* dev_id, struct pt_regs
*regs);
+static int airo_thread(void *data);
+static void timer_func( struct net_device *dev );
static int airo_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
#ifdef WIRELESS_EXT
struct iw_statistics *airo_get_wireless_stats (struct net_device *dev);
@@ -996,8 +995,8 @@
int flashcard(struct net_device *dev, aironet_ioctl *comp);
#endif /* CISCO_EXT */
#ifdef MICSUPPORT
-static void micinit(struct airo_info *ai, MICRid *micr);
-static void micsetup(struct airo_info *ai);
+static void micinit(struct airo_info *ai);
+static int micsetup(struct airo_info *ai);
static int encapsulate(struct airo_info *ai, etherHead *pPacket, MICBuffer *buffer, int len);
static int decapsulate(struct airo_info *ai, MICBuffer *mic, etherHead *pPacket, u16 payLen);
#endif
@@ -1015,41 +1014,50 @@
int need_commit; // Need to set config
char keyindex; // Used with auto wep
char defindex; // Used with auto wep
- struct timer_list timer;
struct proc_dir_entry *proc_entry;
struct airo_info *next;
spinlock_t aux_lock;
unsigned long flags;
-#define FLAG_PROMISC IFF_PROMISC /* 0x100 - include/linux/if.h */
-#define FLAG_RADIO_OFF 0x02 /* User disabling of MAC */
-#define FLAG_RADIO_DOWN 0x08 /* ifup/ifdown disabling of MAC */
-#define FLAG_FLASHING 0x10
-#define FLAG_ADHOC 0x01 /* Needed by MIC */
-#define FLAG_MIC_CAPABLE 0x20
-#define FLAG_UPDATE_MULTI 0x40
-#define FLAG_UPDATE_UNI 0x80
-#define FLAG_802_11 0x200
-#define FLAG_PENDING_XMIT 0x400
-#define FLAG_PENDING_XMIT11 0x800
-#define FLAG_PCI 0x1000
+#define FLAG_PROMISC 8 /* IFF_PROMISC 0x100 - include/linux/if.h */
+#define FLAG_RADIO_OFF 0 /* User disabling of MAC */
+#define FLAG_RADIO_DOWN 1 /* ifup/ifdown disabling of MAC */
+#define FLAG_RADIO_MASK 0x03
+#define FLAG_FLASHING 2
+#define FLAG_ADHOC 3 /* Needed by MIC */
+#define FLAG_MIC_CAPABLE 4
+#define FLAG_UPDATE_MULTI 5
+#define FLAG_UPDATE_UNI 6
+#define FLAG_802_11 7
+#define FLAG_PENDING_XMIT 9
+#define FLAG_PENDING_XMIT11 10
+#define FLAG_PCI 11
+#define JOB_MASK 0xff0000
+#define JOB_DIE 16
+#define JOB_XMIT 17
+#define JOB_XMIT11 18
+#define JOB_STATS 19
+#define JOB_PROMISC 20
+#define JOB_MIC 21
+#define JOB_EVENT 22
+#define JOB_AUTOWEP 23
int (*bap_read)(struct airo_info*, u16 *pu16Dst, int bytelen,
int whichbap);
unsigned short *flash;
tdsRssiEntry *rssi;
- struct semaphore sem;
struct task_struct *task;
- struct tq_struct stats_task;
- struct tq_struct promisc_task;
+ struct semaphore sem;
+ pid_t thr_pid;
+ wait_queue_head_t thr_wait;
+ struct completion thr_exited;
+ unsigned long expires;
struct {
struct sk_buff *skb;
int fid;
- struct tq_struct task;
} xmit, xmit11;
struct net_device *wifidev;
#ifdef WIRELESS_EXT
struct iw_statistics wstats; // wireless stats
unsigned long scan_timestamp; /* Time started to scan */
- struct tq_struct event_task;
#if WIRELESS_EXT > 15
struct iw_spy_data spy_data;
#else /* WIRELESS_EXT > 15 */
@@ -1063,7 +1071,6 @@
/* MIC stuff */
mic_module mod[2];
mic_statistics micstats;
- struct tq_struct mic_task;
};

static inline int bap_read(struct airo_info *ai, u16 *pu16Dst, int bytelen,
@@ -1213,9 +1220,9 @@
cfgr = ai->config;

if ((cfgr.opmode & 0xFF) == MODE_STA_IBSS)
- ai->flags |= FLAG_ADHOC;
+ set_bit(FLAG_ADHOC, &ai->flags);
else
- ai->flags &= ~FLAG_ADHOC;
+ clear_bit(FLAG_ADHOC, &ai->flags);

for(s = &cfgr.len; s <= &cfgr.rtsThres; s++) *s = cpu_to_le16(*s);

@@ -1279,7 +1286,7 @@
struct airo_info *info = dev->priv;
Resp rsp;

- if (info->flags & FLAG_FLASHING)
+ if (test_bit(FLAG_FLASHING, &info->flags))
return -EIO;

/* Make sure the card is configured.
@@ -1293,7 +1300,7 @@

if (info->wifidev != dev) {
/* Power on the MAC controller (which may have been disabled) */
- info->flags &= ~FLAG_RADIO_DOWN;
+ clear_bit(FLAG_RADIO_DOWN, &info->flags);
enable_interrupts(info);
}
enable_MAC(info, &rsp, 1);
@@ -1351,7 +1358,7 @@
}
}

-static void airo_do_xmit(struct net_device *dev) {
+static void airo_end_xmit(struct net_device *dev) {
u16 status;
int i;
struct airo_info *priv = dev->priv;
@@ -1359,17 +1366,10 @@
int fid = priv->xmit.fid;
u32 *fids = priv->fids;

- if (down_trylock(&priv->sem) != 0) {
- priv->flags |= FLAG_PENDING_XMIT;
- netif_stop_queue(dev);
- priv->xmit.task.routine = (void (*)(void *))airo_do_xmit;
- priv->xmit.task.data = (void *)dev;
- schedule_task(&priv->xmit.task);
- return;
- }
+ clear_bit(JOB_XMIT, &priv->flags);
+ clear_bit(FLAG_PENDING_XMIT, &priv->flags);
status = transmit_802_3_packet (priv, fids[fid], skb->data);
up(&priv->sem);
- priv->flags &= ~FLAG_PENDING_XMIT;

i = 0;
if ( status == SUCCESS ) {
@@ -1413,11 +1413,17 @@
fids[i] |= (len << 16);
priv->xmit.skb = skb;
priv->xmit.fid = i;
- airo_do_xmit(dev);
+ if (down_trylock(&priv->sem) != 0) {
+ set_bit(FLAG_PENDING_XMIT, &priv->flags);
+ netif_stop_queue(dev);
+ set_bit(JOB_XMIT, &priv->flags);
+ wake_up_interruptible(&priv->thr_wait);
+ } else
+ airo_end_xmit(dev);
return 0;
}

-static void airo_do_xmit11(struct net_device *dev) {
+static void airo_end_xmit11(struct net_device *dev) {
u16 status;
int i;
struct airo_info *priv = dev->priv;
@@ -1425,17 +1431,10 @@
int fid = priv->xmit11.fid;
u32 *fids = priv->fids;

- if (down_trylock(&priv->sem) != 0) {
- priv->flags |= FLAG_PENDING_XMIT11;
- netif_stop_queue(dev);
- priv->xmit11.task.routine = (void (*)(void *))airo_do_xmit11;
- priv->xmit11.task.data = (void *)dev;
- schedule_task(&priv->xmit11.task);
- return;
- }
+ clear_bit(JOB_XMIT11, &priv->flags);
+ clear_bit(FLAG_PENDING_XMIT11, &priv->flags);
status = transmit_802_11_packet (priv, fids[fid], skb->data);
up(&priv->sem);
- priv->flags &= ~FLAG_PENDING_XMIT11;

i = MAX_FIDS / 2;
if ( status == SUCCESS ) {
@@ -1479,7 +1478,13 @@
fids[i] |= (len << 16);
priv->xmit11.skb = skb;
priv->xmit11.fid = i;
- airo_do_xmit11(dev);
+ if (down_trylock(&priv->sem) != 0) {
+ set_bit(FLAG_PENDING_XMIT11, &priv->flags);
+ netif_stop_queue(dev);
+ set_bit(JOB_XMIT11, &priv->flags);
+ wake_up_interruptible(&priv->thr_wait);
+ } else
+ airo_end_xmit11(dev);
return 0;
}

@@ -1487,29 +1492,24 @@
StatsRid stats_rid;
u32 *vals = stats_rid.vals;

- if (down_trylock(&ai->sem) == 0) {
- readStatsRid(ai, &stats_rid, RID_STATS, 0);
- up(&ai->sem);
+ clear_bit(JOB_STATS, &ai->flags);
+ readStatsRid(ai, &stats_rid, RID_STATS, 0);
+ up(&ai->sem);

- ai->stats.rx_packets = vals[43] + vals[44] + vals[45];
- ai->stats.tx_packets = vals[39] + vals[40] + vals[41];
- ai->stats.rx_bytes = vals[92];
- ai->stats.tx_bytes = vals[91];
- ai->stats.rx_errors = vals[0] + vals[2] + vals[3] + vals[4];
- ai->stats.tx_errors = vals[42] + ai->stats.tx_fifo_errors;
- ai->stats.multicast = vals[43];
- ai->stats.collisions = vals[89];
-
- /* detailed rx_errors: */
- ai->stats.rx_length_errors = vals[3];
- ai->stats.rx_crc_errors = vals[4];
- ai->stats.rx_frame_errors = vals[2];
- ai->stats.rx_fifo_errors = vals[0];
- } else {
- ai->stats_task.routine = (void (*)(void *))airo_read_stats;
- ai->stats_task.data = (void *)ai;
- schedule_task(&ai->stats_task);
- }
+ ai->stats.rx_packets = vals[43] + vals[44] + vals[45];
+ ai->stats.tx_packets = vals[39] + vals[40] + vals[41];
+ ai->stats.rx_bytes = vals[92];
+ ai->stats.tx_bytes = vals[91];
+ ai->stats.rx_errors = vals[0] + vals[2] + vals[3] + vals[4];
+ ai->stats.tx_errors = vals[42] + ai->stats.tx_fifo_errors;
+ ai->stats.multicast = vals[43];
+ ai->stats.collisions = vals[89];
+
+ /* detailed rx_errors: */
+ ai->stats.rx_length_errors = vals[3];
+ ai->stats.rx_crc_errors = vals[4];
+ ai->stats.rx_frame_errors = vals[2];
+ ai->stats.rx_fifo_errors = vals[0];
}

struct net_device_stats *airo_get_stats(struct net_device *dev)
@@ -1517,46 +1517,37 @@
struct airo_info *local = dev->priv;

/* Get stats out of the card if available */
- airo_read_stats(local);
+ if (down_trylock(&local->sem) != 0) {
+ set_bit(JOB_STATS, &local->flags);
+ wake_up_interruptible(&local->thr_wait);
+ } else
+ airo_read_stats(local);

return &local->stats;
}

-static void airo_end_promisc(struct airo_info *ai) {
- Resp rsp;
-
- if ((IN4500(ai, EVSTAT) & EV_CMD) != 0) {
- completecommand(ai, &rsp);
- up(&ai->sem);
- } else {
- ai->promisc_task.routine = (void (*)(void *))airo_end_promisc;
- ai->promisc_task.data = (void *)ai;
- schedule_task(&ai->promisc_task);
- }
-}
-
static void airo_set_promisc(struct airo_info *ai) {
Cmd cmd;
+ Resp rsp;

- if (down_trylock(&ai->sem) == 0) {
- memset(&cmd, 0, sizeof(cmd));
- cmd.cmd=CMD_SETMODE;
- cmd.parm0=(ai->flags&IFF_PROMISC) ? PROMISC : NOPROMISC;
- sendcommand(ai, &cmd);
- airo_end_promisc(ai);
- } else {
- ai->promisc_task.routine = (void (*)(void *))airo_set_promisc;
- ai->promisc_task.data = (void *)ai;
- schedule_task(&ai->promisc_task);
- }
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.cmd=CMD_SETMODE;
+ clear_bit(JOB_PROMISC, &ai->flags);
+ cmd.parm0=(ai->flags&IFF_PROMISC) ? PROMISC : NOPROMISC;
+ issuecommand(ai, &cmd, &rsp);
+ up(&ai->sem);
}

static void airo_set_multicast_list(struct net_device *dev) {
struct airo_info *ai = dev->priv;

if ((dev->flags ^ ai->flags) & IFF_PROMISC) {
- ai->flags ^= IFF_PROMISC;
- airo_set_promisc(ai);
+ change_bit(FLAG_PROMISC, &ai->flags);
+ if (down_trylock(&ai->sem) != 0) {
+ set_bit(JOB_PROMISC, &ai->flags);
+ wake_up_interruptible(&ai->thr_wait);
+ } else
+ airo_set_promisc(ai);
}

if ((dev->flags&IFF_ALLMULTI)||dev->mc_count>0) {
@@ -1602,7 +1593,7 @@
* That's the method that is most friendly towards the network
* stack (i.e. the network stack won't try to broadcast
* anything on the interface and routes are gone. Jean II */
- ai->flags |= FLAG_RADIO_DOWN;
+ set_bit(FLAG_RADIO_DOWN, &ai->flags);
disable_MAC(ai, 1);
#endif
disable_interrupts( ai );
@@ -1617,8 +1608,6 @@
struct airo_info *ai = dev->priv;
disable_interrupts(ai);
free_irq( dev->irq, dev );
- if (auto_wep)
- del_timer_sync(&ai->timer);
takedown_proc_entry( dev, ai );
if (ai->registered) {
unregister_netdev( dev );
@@ -1629,7 +1618,9 @@
}
ai->registered = 0;
}
- flush_scheduled_tasks();
+ set_bit(JOB_DIE, &ai->flags);
+ kill_proc(ai->thr_pid, SIGTERM, 1);
+ wait_for_completion(&ai->thr_exited);
if (ai->flash)
kfree(ai->flash);
if (ai->rssi)
@@ -1734,9 +1725,14 @@
sema_init(&ai->sem, 1);
ai->need_commit = 0;
ai->config.len = 0;
+ init_waitqueue_head (&ai->thr_wait);
+ init_completion (&ai->thr_exited);
+ ai->thr_pid = kernel_thread(airo_thread, dev, CLONE_FS | CLONE_FILES);
+ if (ai->thr_pid < 0)
+ goto err_out_free;
rc = add_airo_dev( dev );
if (rc)
- goto err_out_free;
+ goto err_out_thr;

/* The Airo-specific entries in the device structure. */
dev->hard_start_xmit = &airo_start_xmit;
@@ -1776,7 +1772,7 @@
}
} else {
ai->bap_read = fast_bap_read;
- ai->flags |= FLAG_FLASHING;
+ set_bit(FLAG_FLASHING, &ai->flags);
}

rc = register_netdev(dev);
@@ -1807,6 +1803,10 @@
free_irq(dev->irq, dev);
err_out_unlink:
del_airo_dev(dev);
+err_out_thr:
+ set_bit(JOB_DIE, &ai->flags);
+ kill_proc(ai->thr_pid, SIGTERM, 1);
+ wait_for_completion(&ai->thr_exited);
err_out_free:
kfree(dev);
return NULL;
@@ -1870,38 +1870,103 @@
union iwreq_data wrqu;
StatusRid status_rid;

- if (down_trylock(&ai->sem) == 0) {
- PC4500_readrid(ai, RID_STATUS, &status_rid, sizeof(status_rid), 0);
- up(&ai->sem);
- wrqu.data.length = 0;
- wrqu.data.flags = 0;
- memcpy(wrqu.ap_addr.sa_data, status_rid.bssid[0], ETH_ALEN);
- wrqu.ap_addr.sa_family = ARPHRD_ETHER;
+ clear_bit(JOB_EVENT, &ai->flags);
+ PC4500_readrid(ai, RID_STATUS, &status_rid, sizeof(status_rid), 0);
+ up(&ai->sem);
+ wrqu.data.length = 0;
+ wrqu.data.flags = 0;
+ memcpy(wrqu.ap_addr.sa_data, status_rid.bssid[0], ETH_ALEN);
+ wrqu.ap_addr.sa_family = ARPHRD_ETHER;

- /* Send event to user space */
- wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
- } else {
- ai->event_task.routine = (void (*)(void *))airo_send_event;
- ai->event_task.data = (void *)dev;
- schedule_task(&ai->event_task);
- }
+ /* Send event to user space */
+ wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
}
#endif

-static void airo_read_mic(struct airo_info *ai) {
- MICRid mic_rid;
+static int airo_thread(void *data) {
+ struct net_device *dev = data;
+ struct airo_info *ai = dev->priv;
+ int locked;
+
+ daemonize();
+ reparent_to_init();
+ sigemptyset(&current->blocked);
+ recalc_sigpending(current);
+
+ strncpy (current->comm, dev->name, sizeof(current->comm) - 1);
+ current->comm[sizeof(current->comm) - 1] = '\0';
+
+ while(1) {
+ if (signal_pending(current))
+ flush_signals(current);

- if (down_trylock(&ai->sem) == 0) {
- PC4500_readrid(ai, RID_MIC, &mic_rid, sizeof(mic_rid), 0);
- up(&ai->sem);
+ if (test_bit(JOB_DIE, &ai->flags))
+ break;
+
+ if (ai->flags & JOB_MASK) {
+ locked = down_interruptible(&ai->sem);
+ } else {
+ wait_queue_t wait;
+
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&ai->thr_wait, &wait);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (ai->flags & JOB_MASK)
+ break;
+ if (ai->expires) {
+ if (time_after_eq(jiffies,ai->expires)){
+ set_bit(JOB_AUTOWEP,&ai->flags);
+ break;
+ }
+ if (!signal_pending(current)) {
+ schedule_timeout(ai->expires - jiffies);
+ continue;
+ }
+ } else if (!signal_pending(current)) {
+ schedule();
+ continue;
+ }
+ break;
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&ai->thr_wait, &wait);
+ locked = 1;
+ }
+
+ if (locked)
+ continue;
+
+ if (test_bit(JOB_DIE, &ai->flags)) {
+ up(&ai->sem);
+ break;
+ }
+
+ if (test_bit(FLAG_FLASHING, &ai->flags)) {
+ up(&ai->sem);
+ continue;
+ }
+
+ if (test_bit(JOB_XMIT, &ai->flags))
+ airo_end_xmit(dev);
+ else if (test_bit(JOB_XMIT11, &ai->flags))
+ airo_end_xmit11(dev);
+ else if (test_bit(JOB_STATS, &ai->flags))
+ airo_read_stats(ai);
+ else if (test_bit(JOB_PROMISC, &ai->flags))
+ airo_set_promisc(ai);
#ifdef MICSUPPORT
- micinit (ai, &mic_rid);
+ else if (test_bit(JOB_MIC, &ai->flags))
+ micinit(ai);
#endif
- } else {
- ai->mic_task.routine = (void (*)(void *))airo_read_mic;
- ai->mic_task.data = (void *)ai;
- schedule_task(&ai->mic_task);
+#if WIRELESS_EXT > 13
+ else if (test_bit(JOB_EVENT, &ai->flags))
+ airo_send_event(dev);
+#endif
+ else if (test_bit(JOB_AUTOWEP, &ai->flags))
+ timer_func(dev);
}
+ complete_and_exit (&ai->thr_exited, 0);
}

static void airo_interrupt ( int irq, void* dev_id, struct pt_regs *regs) {
@@ -1930,8 +1995,15 @@

if ( status & EV_MIC ) {
OUT4500( apriv, EVACK, EV_MIC );
- if (apriv->flags & FLAG_MIC_CAPABLE)
- airo_read_mic( apriv );
+#ifdef MICSUPPORT
+ if (test_bit(FLAG_MIC_CAPABLE, &apriv->flags)) {
+ if (down_trylock(&apriv->sem) != 0) {
+ set_bit(JOB_MIC, &apriv->flags);
+ wake_up_interruptible(&apriv->thr_wait);
+ } else
+ micinit (apriv);
+ }
+#endif
}
if ( status & EV_LINK ) {
#if WIRELESS_EXT > 13
@@ -1973,15 +2045,18 @@
#define RC_NOAUTH 9 /* Station requesting (Re)Association is not
Authenticated with the responding station */
if (newStatus != ASSOCIATED) {
- if (auto_wep && !timer_pending(&apriv->timer)) {
- apriv->timer.expires = RUN_AT(HZ*3);
- add_timer(&apriv->timer);
+ if (auto_wep && !apriv->expires) {
+ apriv->expires = RUN_AT(3*HZ);
+ wake_up_interruptible(&apriv->thr_wait);
}
} else {
struct task_struct *task = apriv->task;
+ if (auto_wep)
+ apriv->expires = 0;
if (task)
wake_up_process (task);
- apriv->flags|=FLAG_UPDATE_UNI|FLAG_UPDATE_MULTI;
+ set_bit(FLAG_UPDATE_UNI, &apriv->flags);
+ set_bit(FLAG_UPDATE_MULTI, &apriv->flags);
}
#if WIRELESS_EXT > 13
/* Question : is ASSOCIATED the only status
@@ -2002,7 +2077,11 @@
wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
apriv->scan_timestamp = 0;
}
- airo_send_event(dev);
+ if (down_trylock(&apriv->sem) != 0) {
+ set_bit(JOB_EVENT, &apriv->flags);
+ wake_up_interruptible(&apriv->thr_wait);
+ } else
+ airo_send_event(dev);
} else {
memset(wrqu.ap_addr.sa_data, '\0', ETH_ALEN);
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
@@ -2033,7 +2112,7 @@
fid = IN4500( apriv, RXFID );

/* Get the packet length */
- if (apriv->flags & FLAG_802_11) {
+ if (test_bit(FLAG_802_11, &apriv->flags)) {
bap_setup (apriv, fid, 4, BAP0);
bap_read (apriv, (u16*)&hdr, sizeof(hdr), BAP0);
/* Bad CRC. Ignore packet */
@@ -2052,7 +2131,7 @@
len = 0;
}
if (len) {
- if (apriv->flags & FLAG_802_11) {
+ if (test_bit(FLAG_802_11, &apriv->flags)) {
bap_read (apriv, (u16*)&fc, sizeof(fc), BAP0);
fc = le16_to_cpu(fc);
switch (fc & 0xc) {
@@ -2081,7 +2160,7 @@
}
if (len) {
buffer = (u16*)skb_put (skb, len + hdrlen);
- if (apriv->flags & FLAG_802_11) {
+ if (test_bit(FLAG_802_11, &apriv->flags)) {
buffer[0] = fc;
bap_read (apriv, buffer + 1, hdrlen - 2, BAP0);
if (hdrlen == 24)
@@ -2128,11 +2207,12 @@
char *sa;
struct iw_quality wstats;
/* Prepare spy data : addr + qual */
- sa = (char*)buffer + ((apriv->flags & FLAG_802_11) ? 10 : 6);
- if (!(apriv->flags & FLAG_802_11)) {
+ if (!test_bit(FLAG_802_11, &apriv->flags)) {
+ sa = (char*)buffer + 6;
bap_setup (apriv, fid, 8, BAP0);
bap_read (apriv, (u16*)hdr.rssi, 2, BAP0);
- }
+ } else
+ sa = (char*)buffer + 10;
wstats.qual = hdr.rssi[0];
if (apriv->rssi)
wstats.level = 0x100 - apriv->rssi[hdr.rssi[1]].rssidBm;
@@ -2149,12 +2229,12 @@
int i;
char *sa;

- sa = (char*)buffer + ((apriv->flags & FLAG_802_11) ? 10 : 6);
+ sa = (char*)buffer + (test_bit(FLAG_802_11, &apriv->flags) ? 10 : 6);

for (i=0; i<apriv->spy_number; i++)
if (!memcmp(sa,apriv->spy_address[i],ETH_ALEN))
{
- if (!(apriv->flags & FLAG_802_11)) {
+ if (!test_bit(FLAG_802_11, &apriv->flags)) {
bap_setup (apriv, fid, 8, BAP0);
bap_read (apriv, (u16*)hdr.rssi, 2, BAP0);
}
@@ -2172,7 +2252,7 @@
#endif /* WIRELESS_EXT > 15 */
OUT4500( apriv, EVACK, EV_RX);

- if (apriv->flags & FLAG_802_11) {
+ if (test_bit(FLAG_802_11, &apriv->flags)) {
skb->mac.raw = skb->data;
skb->pkt_type = PACKET_OTHERHOST;
skb->dev = apriv->wifidev;
@@ -2210,10 +2290,10 @@
/* Set up to be used again */
apriv->fids[index] &= 0xffff;
if (index < MAX_FIDS / 2) {
- if (!(apriv->flags & FLAG_PENDING_XMIT))
+ if (!test_bit(FLAG_PENDING_XMIT, &apriv->flags))
netif_wake_queue(dev);
} else {
- if (!(apriv->flags & FLAG_PENDING_XMIT11))
+ if (!test_bit(FLAG_PENDING_XMIT11, &apriv->flags))
netif_wake_queue(apriv->wifidev);
}
} else {
@@ -2273,7 +2353,7 @@
* instead of this flag, but I don't trust it *within* the
* open/close functions, and testing both flags together is
* "cheaper" - Jean II */
- if (ai->flags & (FLAG_RADIO_OFF|FLAG_RADIO_DOWN)) return SUCCESS;
+ if (ai->flags & FLAG_RADIO_MASK) return SUCCESS;
memset(&cmd, 0, sizeof(cmd));
cmd.cmd = MAC_ENABLE;
if (!lock)
@@ -2394,10 +2474,10 @@
ai->config.opmode = adhoc ? MODE_STA_IBSS : MODE_STA_ESS;

#ifdef MICSUPPORT
- if ((cap_rid.len>=sizeof(cap_rid)) && (cap_rid.extSoftCap&1)) {
+ if ((cap_rid.len>=sizeof(cap_rid)) && (cap_rid.extSoftCap&1) &&
+ (micsetup(ai) == SUCCESS)) {
ai->config.opmode |= MODE_MIC;
- ai->flags |= FLAG_MIC_CAPABLE;
- micsetup(ai);
+ set_bit(FLAG_MIC_CAPABLE, &ai->flags);
}
#endif

@@ -2463,34 +2543,15 @@
rc = readWepKeyRid(ai, &wkr, 0);
} while(lastindex != wkr.kindex);

- if (auto_wep && !timer_pending(&ai->timer)) {
- ai->timer.expires = RUN_AT(HZ*3);
- add_timer(&ai->timer);
+ if (auto_wep) {
+ ai->expires = RUN_AT(3*HZ);
+ wake_up_interruptible(&ai->thr_wait);
}
- return SUCCESS;
-}
-
-static u16 issuecommand(struct airo_info *ai, Cmd *pCmd, Resp *pRsp) {
- // Im really paranoid about letting it run forever!
- int max_tries = 600000;
-
- if (sendcommand(ai, pCmd) == (u16)ERROR)
- return ERROR;

- while (max_tries-- && (IN4500(ai, EVSTAT) & EV_CMD) == 0) {
- if (!in_interrupt() && (max_tries & 255) == 0)
- schedule();
- }
- if ( max_tries == -1 ) {
- printk( KERN_ERR
- "airo: Max tries exceeded waiting for command\n" );
- return ERROR;
- }
- completecommand(ai, pRsp);
return SUCCESS;
}

-static u16 sendcommand(struct airo_info *ai, Cmd *pCmd) {
+static u16 issuecommand(struct airo_info *ai, Cmd *pCmd, Resp *pRsp) {
// Im really paranoid about letting it run forever!
int max_tries = 600000;
u16 cmd;
@@ -2509,10 +2570,16 @@
"airo: Max tries exceeded when issueing command\n" );
return ERROR;
}
- return SUCCESS;
-}

-static void completecommand(struct airo_info *ai, Resp *pRsp) {
+ while (max_tries-- && (IN4500(ai, EVSTAT) & EV_CMD) == 0) {
+ if (!in_interrupt() && (max_tries & 255) == 0)
+ schedule();
+ }
+ if ( max_tries == -1 ) {
+ printk( KERN_ERR
+ "airo: Max tries exceeded waiting for command\n" );
+ return ERROR;
+ }
// command completed
pRsp->status = IN4500(ai, STATUS);
pRsp->rsp0 = IN4500(ai, RESP0);
@@ -2525,6 +2592,8 @@
}
// acknowledge processing the status/response
OUT4500(ai, EVACK, EV_CMD);
+
+ return SUCCESS;
}

/* Sets up the bap to start exchange data. whichbap should
@@ -2811,7 +2880,7 @@
len -= ETH_ALEN * 2;

#ifdef MICSUPPORT
- if ((ai->flags & FLAG_MIC_CAPABLE) && ai->micstats.enabled &&
+ if (test_bit(FLAG_MIC_CAPABLE, &ai->flags) && ai->micstats.enabled &&
(ntohs(((u16 *)pPacket)[6]) != 0x888E)) {
if (encapsulate(ai,(etherHead *)pPacket,&pMic,len) != SUCCESS)
return ERROR;
@@ -3314,7 +3383,7 @@
if ((ai->config.rmode & 0xff) >= RXMODE_RFMON)
ai->need_commit = 2;
ai->config.rmode &= 0xfe00;
- ai->flags &= ~FLAG_802_11;
+ clear_bit (FLAG_802_11, &ai->flags);
ai->config.opmode &= 0xFF00;
ai->config.scanMode = SCANMODE_ACTIVE;
if ( line[0] == 'a' ) {
@@ -3324,11 +3393,11 @@
if ( line[0] == 'r' ) {
ai->config.rmode |= RXMODE_RFMON | RXMODE_DISABLE_802_3_HEADER;
ai->config.scanMode = SCANMODE_PASSIVE;
- ai->flags |= FLAG_802_11;
+ set_bit (FLAG_802_11, &ai->flags);
} else if ( line[0] == 'y' ) {
ai->config.rmode |= RXMODE_RFMON_ANYBSS | RXMODE_DISABLE_802_3_HEADER;
ai->config.scanMode = SCANMODE_PASSIVE;
- ai->flags |= FLAG_802_11;
+ set_bit (FLAG_802_11, &ai->flags);
} else if ( line[0] == 'l' )
ai->config.rmode |= RXMODE_LANMON;
}
@@ -3339,9 +3408,9 @@
else if (!strncmp(line,"Radio: ", 7)) {
line += 7;
if (!strncmp(line,"off",3)) {
- ai->flags |= FLAG_RADIO_OFF;
+ set_bit (FLAG_RADIO_OFF, &ai->flags);
} else {
- ai->flags &= ~FLAG_RADIO_OFF;
+ clear_bit (FLAG_RADIO_OFF, &ai->flags);
}
}
/*** NodeName processing */
@@ -3545,7 +3614,7 @@
(ai->config.opmode & 0xFF) == 1 ? get_rmode(ai->config.rmode):
(ai->config.opmode & 0xFF) == 2 ? "AP" :
(ai->config.opmode & 0xFF) == 3 ? "AP RPTR" : "Error",
- ai->flags&FLAG_RADIO_OFF ? "off" : "on",
+ test_bit(FLAG_RADIO_OFF, &ai->flags) ? "off" : "on",
ai->config.nodeName,
ai->config.powerSaveMode == 0 ? "CAM" :
ai->config.powerSaveMode == 1 ? "PSP" :
@@ -4012,23 +4081,14 @@
will switch WEP modes to see if that will help. If the card is
associated we will check every minute to see if anything has
changed. */
-static void timer_func( u_long data ) {
- struct net_device *dev = (struct net_device*)data;
+static void timer_func( struct net_device *dev ) {
struct airo_info *apriv = dev->priv;
- u16 linkstat = IN4500(apriv, LINKSTAT);
Resp rsp;

- if (!(apriv->flags & FLAG_FLASHING) && (linkstat != 0x400)) {
/* We don't have a link so try changing the authtype */
- if (down_trylock(&apriv->sem) != 0) {
- apriv->timer.expires = RUN_AT(1);
- add_timer(&apriv->timer);
- return;
- }
-
- readConfigRid(apriv, 0);
- disable_MAC(apriv, 0);
- switch(apriv->config.authType) {
+ readConfigRid(apriv, 0);
+ disable_MAC(apriv, 0);
+ switch(apriv->config.authType) {
case AUTH_ENCRYPT:
/* So drop to OPEN */
apriv->config.authType = AUTH_OPEN;
@@ -4047,16 +4107,15 @@
break;
default: /* We'll escalate to SHAREDKEY */
apriv->config.authType = AUTH_SHAREDKEY;
- }
- apriv->need_commit = 1;
- writeConfigRid(apriv, 0);
- enable_MAC(apriv, &rsp, 0);
- up(&apriv->sem);
+ }
+ apriv->need_commit = 1;
+ writeConfigRid(apriv, 0);
+ enable_MAC(apriv, &rsp, 0);
+ up(&apriv->sem);

/* Schedule check to see if the change worked */
- apriv->timer.expires = RUN_AT(HZ*3);
- add_timer(&apriv->timer);
- }
+ clear_bit(JOB_AUTOWEP, &apriv->flags);
+ apriv->expires = RUN_AT(HZ*3);
}

static int add_airo_dev( struct net_device *dev ) {
@@ -4064,15 +4123,6 @@
if ( !node )
return -ENOMEM;

- if ( auto_wep ) {
- struct airo_info *apriv=dev->priv;
- struct timer_list *timer = &apriv->timer;
-
- timer->function = timer_func;
- timer->data = (u_long)dev;
- init_timer(timer);
- }
-
node->dev = dev;
node->next = airo_devices;
airo_devices = node;
@@ -4103,7 +4153,7 @@
return -ENODEV;

pci_set_drvdata(pdev, dev);
- ((struct airo_info *)dev->priv)->flags |= FLAG_PCI;
+ clear_bit (FLAG_PCI, &((struct airo_info *)dev->priv)->flags);
return 0;
}

@@ -4149,7 +4199,7 @@
while( airo_devices ) {
printk( KERN_INFO "airo: Unregistering %s\n", airo_devices->dev->name );
#ifdef CONFIG_PCI
- if (((struct airo_info *)airo_devices->dev->priv)->flags & FLAG_PCI)
+ if (test_bit(FLAG_PCI, &((struct airo_info *)airo_devices->dev->priv)->flags))
is_pci = 1;
#endif
stop_airo_card( airo_devices->dev, 1 );
@@ -4623,28 +4673,28 @@
local->config.opmode |= MODE_STA_IBSS;
local->config.rmode &= 0xfe00;
local->config.scanMode = SCANMODE_ACTIVE;
- local->flags &= ~FLAG_802_11;
+ clear_bit (FLAG_802_11, &local->flags);
break;
case IW_MODE_INFRA:
local->config.opmode &= 0xFF00;
local->config.opmode |= MODE_STA_ESS;
local->config.rmode &= 0xfe00;
local->config.scanMode = SCANMODE_ACTIVE;
- local->flags &= ~FLAG_802_11;
+ clear_bit (FLAG_802_11, &local->flags);
break;
case IW_MODE_MASTER:
local->config.opmode &= 0xFF00;
local->config.opmode |= MODE_AP;
local->config.rmode &= 0xfe00;
local->config.scanMode = SCANMODE_ACTIVE;
- local->flags &= ~FLAG_802_11;
+ clear_bit (FLAG_802_11, &local->flags);
break;
case IW_MODE_REPEAT:
local->config.opmode &= 0xFF00;
local->config.opmode |= MODE_AP_RPTR;
local->config.rmode &= 0xfe00;
local->config.scanMode = SCANMODE_ACTIVE;
- local->flags &= ~FLAG_802_11;
+ clear_bit (FLAG_802_11, &local->flags);
break;
case IW_MODE_MONITOR:
local->config.opmode &= 0xFF00;
@@ -4652,7 +4702,7 @@
local->config.rmode &= 0xfe00;
local->config.rmode |= RXMODE_RFMON | RXMODE_DISABLE_802_3_HEADER;
local->config.scanMode = SCANMODE_PASSIVE;
- local->flags |= FLAG_802_11;
+ set_bit (FLAG_802_11, &local->flags);
break;
default:
return -EINVAL;
@@ -4841,14 +4891,14 @@
readCapabilityRid(local, &cap_rid);

if (vwrq->disabled) {
- local->flags |= FLAG_RADIO_OFF;
+ set_bit (FLAG_RADIO_OFF, &local->flags);
local->need_commit = 1;
return -EINPROGRESS; /* Call commit handler */
}
if (vwrq->flags != IW_TXPOW_MWATT) {
return -EINVAL;
}
- local->flags &= ~FLAG_RADIO_OFF;
+ clear_bit (FLAG_RADIO_OFF, &local->flags);
for (i = 0; cap_rid.txPowerLevels[i] && (i < 8); i++)
if ((vwrq->value==cap_rid.txPowerLevels[i])) {
local->config.txPower = vwrq->value;
@@ -4872,7 +4922,7 @@

vwrq->value = local->config.txPower;
vwrq->fixed = 1; /* No power control */
- vwrq->disabled = (local->flags & FLAG_RADIO_OFF);
+ vwrq->disabled = test_bit(FLAG_RADIO_OFF, &local->flags);
vwrq->flags = IW_TXPOW_MWATT;

return 0;
@@ -5522,10 +5572,14 @@
writeSsidRid(local, &SSID_rid);
writeAPListRid(local, &APList_rid);
}
- writeConfigRid(local, 1);
- enable_MAC(local, &rsp, 1);
+ if (down_interruptible(&local->sem))
+ return -ERESTARTSYS;
+ writeConfigRid(local, 0);
+ enable_MAC(local, &rsp, 0);
if (local->need_commit > 1)
airo_set_promisc(local);
+ else
+ up(&local->sem);

return 0;
}
@@ -6063,7 +6117,7 @@
unsigned char *iobuf;
struct airo_info *ai = dev->priv;

- if (ai->flags & FLAG_FLASHING)
+ if (test_bit(FLAG_FLASHING, &ai->flags))
return -EIO;

switch(comp->command)
@@ -6131,7 +6185,7 @@
if (!capable(CAP_NET_ADMIN))
return -EPERM;

- if (ai->flags & FLAG_FLASHING)
+ if (test_bit(FLAG_FLASHING, &ai->flags))
return -EIO;

ridcode = 0;
@@ -6205,13 +6259,13 @@
if (comp->command == AIROPCFG) {
ConfigRid *cfg = (ConfigRid *)iobuf;

- if (ai->flags & FLAG_MIC_CAPABLE)
+ if (test_bit(FLAG_MIC_CAPABLE, &ai->flags))
cfg->opmode |= MODE_MIC;

if ((cfg->opmode & 0xFF) == MODE_STA_IBSS)
- ai->flags |= FLAG_ADHOC;
+ set_bit (FLAG_ADHOC, &ai->flags);
else
- ai->flags &= ~FLAG_ADHOC;
+ clear_bit (FLAG_ADHOC, &ai->flags);
}

if((*writer)(ai, ridcode, iobuf,comp->len,1)) {
@@ -6322,7 +6376,7 @@
*/

int setflashmode (struct airo_info *ai) {
- ai->flags |= FLAG_FLASHING;
+ set_bit (FLAG_FLASHING, &ai->flags);

OUT4500(ai, SWS0, FLASH_COMMAND);
OUT4500(ai, SWS1, FLASH_COMMAND);
@@ -6338,7 +6392,7 @@
schedule_timeout (HZ/2); /* 500ms delay */

if(!waitbusy(ai)) {
- ai->flags &= ~FLAG_FLASHING;
+ clear_bit (FLAG_FLASHING, &ai->flags);
printk(KERN_INFO "Waitbusy hang after setflash mode\n");
return -EIO;
}
@@ -6444,7 +6498,7 @@

set_current_state (TASK_UNINTERRUPTIBLE);
schedule_timeout (HZ); /* Added 12/7/00 */
- ai->flags &= ~FLAG_FLASHING;
+ clear_bit (FLAG_FLASHING, &ai->flags);
status = setup_card(ai, dev->dev_addr);

for( i = 0; i < MAX_FIDS; i++ ) {
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