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Subject[PATCH v2 30/41] CAPI: Drop atomic ttyopencount
Date
Not needed, tty->count keeps track of this information. At this chance,
drop traces of ancient attempts to debug this logic via _DEBUG_REFCOUNT.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
---
drivers/isdn/capi/capi.c | 30 ++++++++++--------------------
1 files changed, 10 insertions(+), 20 deletions(-)

diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 0b264b4..867589a 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -45,7 +45,6 @@ MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
MODULE_AUTHOR("Carsten Paeth");
MODULE_LICENSE("GPL");

-#undef _DEBUG_REFCOUNT /* alloc/free and open/close debug */
#undef _DEBUG_TTYFUNCS /* call to tty_driver */
#undef _DEBUG_DATAFLOW /* data flow */

@@ -97,7 +96,6 @@ struct capiminor {
int ttyinstop;
int ttyoutstop;
struct sk_buff *ttyskb;
- atomic_t ttyopencount;

struct sk_buff_head inqueue;
int inbytes;
@@ -230,7 +228,6 @@ static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
mp->ap = ap;
mp->ncci = ncci;
mp->msgid = 0;
- atomic_set(&mp->ttyopencount,0);
INIT_LIST_HEAD(&mp->ackqueue);
spin_lock_init(&mp->ackqlock);

@@ -350,8 +347,17 @@ static void capincci_free_minor(struct capincci *np)
static inline unsigned int capincci_minor_opencount(struct capincci *np)
{
struct capiminor *mp = np->minorp;
+ unsigned int count = 0;
+ struct tty_struct *tty;

- return mp ? atomic_read(&mp->ttyopencount) : 0;
+ if (mp) {
+ tty = tty_port_tty_get(&mp->port);
+ if (tty) {
+ count = tty->count;
+ tty_kref_put(tty);
+ }
+ }
+ return count;
}

#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
@@ -1054,10 +1060,6 @@ static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
return err;

spin_lock_irqsave(&workaround_lock, flags);
- atomic_inc(&mp->ttyopencount);
-#ifdef _DEBUG_REFCOUNT
- printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
-#endif
handle_minor_recv(mp);
spin_unlock_irqrestore(&workaround_lock, flags);
return 0;
@@ -1067,18 +1069,6 @@ static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
{
struct capiminor *mp = tty->driver_data;

- if (atomic_dec_and_test(&mp->ttyopencount)) {
-#ifdef _DEBUG_REFCOUNT
- printk(KERN_DEBUG "capinc_tty_close lastclose\n");
-#endif
- }
-#ifdef _DEBUG_REFCOUNT
- printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
-#endif
-
-#ifdef _DEBUG_REFCOUNT
- printk(KERN_DEBUG "capinc_tty_close\n");
-#endif
tty_port_close(&mp->port, tty, filp);
}

--
1.6.0.2


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