FGCOM/dahdi-linux
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

xpp: stability -- cleaner xpp_open/close

Browse Source 
* No need to use spinlock.
 * Just correctly use the atomic open_counter.

Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
This commit is contained in:
Oron Peled 2014-05-12 10:04:28 -04:00 committed by Tzafrir Cohen
parent 08127e14f7
commit dfa7304f51
1 changed files with 7 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/dahdi/xpp/xpp_dahdi.c
View File

@ -722,7 +722,7 @@ int xpp_open(struct dahdi_chan *chan)
xpd_t *xpd;
xbus_t *xbus;
int pos;
unsigned long flags;
int open_counter;
if (!chan) {
NOTICE("open called on a null chan\n");
@ -743,11 +743,9 @@ int xpp_open(struct dahdi_chan *chan)
LINE_NOTICE(xpd, pos, "Cannot open -- device not ready\n");
return -ENODEV;
}
spin_lock_irqsave(&xbus->lock, flags);
atomic_inc(&PHONEDEV(xpd).open_counter);
open_counter = atomic_inc_return(&PHONEDEV(xpd).open_counter);
LINE_DBG(DEVICES, xpd, pos, "%s[%d]: open_counter=%d\n", current->comm,
current->pid, atomic_read(&PHONEDEV(xpd).open_counter));
spin_unlock_irqrestore(&xbus->lock, flags);
current->pid, open_counter);
if (PHONE_METHOD(card_open, xpd))
CALL_PHONE_METHOD(card_open, xpd, pos);
return 0;
@ -757,17 +755,15 @@ EXPORT_SYMBOL(xpp_open);
int xpp_close(struct dahdi_chan *chan)
{
xpd_t *xpd = chan->pvt;
xbus_t *xbus = xpd->xbus;
int pos = chan->chanpos - 1;
unsigned long flags;
int open_counter;
spin_lock_irqsave(&xbus->lock, flags);
spin_unlock_irqrestore(&xbus->lock, flags);
if (PHONE_METHOD(card_close, xpd))
CALL_PHONE_METHOD(card_close, xpd, pos);
/* from xpp_open(): */
open_counter = atomic_dec_return(&PHONEDEV(xpd).open_counter);
LINE_DBG(DEVICES, xpd, pos, "%s[%d]: open_counter=%d\n", current->comm,
current->pid, atomic_read(&PHONEDEV(xpd).open_counter));
atomic_dec(&PHONEDEV(xpd).open_counter); /* from xpp_open() */
current->pid, open_counter);
return 0;
}
EXPORT_SYMBOL(xpp_close);