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Subject[PATCH -next] pktcdvd: improve BKL and compat_ioctl.c usage
Date
The pktcdvd driver uses proper locking and does not need the
BKL in the ioctl and llseek functions of the character device,
so kill both. Moving the compat_ioctl handling from common code
into the driver itself fixes build problems when CONFIG_BLOCK is
disabled.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

---
On Thursday 25 February 2010, Randy Dunlap wrote:
> From: Randy Dunlap <randy.dunlap@oracle.com>
> fs/compat_ioctl.c should omit pktcdvd.h and its ioctl when CONFIG_BLOCK
> is not enabled. This fixes these build errors:
>
> In file included from fs/compat_ioctl.c:105:
> include/linux/pktcdvd.h:166: error: field 'read_queue' has incomplete type
> include/linux/pktcdvd.h:167: error: field 'write_queue' has incomplete type
> include/linux/pktcdvd.h:207: error: field 'orig_bios' has incomplete type
> make[2]: *** [fs/compat_ioctl.o] Error 1

How about this one instead, cleaning pktcdvd ioctl handling up for good?

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 68b5957..f508015 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -48,6 +48,7 @@
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
+#include <linux/compat.h>
#include <linux/kthread.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
@@ -3024,7 +3025,7 @@ static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
mutex_unlock(&ctl_mutex);
}

-static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct pkt_ctrl_command ctrl_cmd;
@@ -3061,10 +3062,20 @@ static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cm
return ret;
}

+#ifdef CONFIG_COMPAT
+static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif

static const struct file_operations pkt_ctl_fops = {
- .ioctl = pkt_ctl_ioctl,
- .owner = THIS_MODULE,
+ .open = nonseekable_open,
+ .unlocked_ioctl = pkt_ctl_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = pkt_ctl_compat_ioctl,
+#endif
+ .owner = THIS_MODULE,
};

static struct miscdevice pkt_misc = {
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 0ca9ec4..fa61262 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -102,7 +102,6 @@
#include <linux/nbd.h>
#include <linux/random.h>
#include <linux/filter.h>
-#include <linux/pktcdvd.h>

#include <linux/hiddev.h>

@@ -1126,8 +1125,6 @@ COMPATIBLE_IOCTL(PPGETMODE)
COMPATIBLE_IOCTL(PPGETPHASE)
COMPATIBLE_IOCTL(PPGETFLAGS)
COMPATIBLE_IOCTL(PPSETFLAGS)
-/* pktcdvd */
-COMPATIBLE_IOCTL(PACKET_CTRL_CMD)
/* Big A */
/* sparc only */
/* Big Q for sound/OSS */

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