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USB: fix spinlock recursion in cdc-acm.c

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this fixes the spinlock recursion issue. The older fix was incomplete.


Signed-off-by: Oliver Neukum <oneukum@suse.de>
Acked-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2007-03-06 10:47:04 +01:00 committed by Greg Kroah-Hartman
parent 6454365260
commit 834dbca5b6
1 changed files with 4 additions and 4 deletions
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8
drivers/usb/class/cdc-acm.c
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@ -332,9 +332,9 @@ static void acm_rx_tasklet(unsigned long _acm)
if (!ACM_READY(acm))
return;
spin_lock(&acm->throttle_lock);
spin_lock_irqsave(&acm->throttle_lock, flags);
throttled = acm->throttle;
spin_unlock(&acm->throttle_lock);
spin_unlock_irqrestore(&acm->throttle_lock, flags);
if (throttled)
return;
@ -352,9 +352,9 @@ next_buffer:
dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
tty_buffer_request_room(tty, buf->size);
spin_lock(&acm->throttle_lock);
spin_lock_irqsave(&acm->throttle_lock, flags);
throttled = acm->throttle;
spin_unlock(&acm->throttle_lock);
spin_unlock_irqrestore(&acm->throttle_lock, flags);
if (!throttled)
tty_insert_flip_string(tty, buf->base, buf->size);
tty_flip_buffer_push(tty);