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| author |   Christian Borntraeger <borntraeger@de.ibm.com> | 2008-08-07 09:18:34 +0200 |
|---|---|---|
| committer |   Rusty Russell <rusty@rustcorp.com.au> | 2008-08-12 17:52:55 +1000 |
| commit | b1b135c8d619cb2c7045d6ee4e48375882518bb5 (patch) | |
| tree | 7c48ccd12e2d01e548351f34bde77fb13f5dc513 /drivers | |
| parent | stop_machine: remove unused variable (diff) | |
| download | linux-dev-b1b135c8d619cb2c7045d6ee4e48375882518bb5.tar.xz linux-dev-b1b135c8d619cb2c7045d6ee4e48375882518bb5.zip | |
fix spinlock recursion in hvc_console
commit 611e097d7707741a336a0677d9d69bec40f29f3d
Author: Christian Borntraeger <borntraeger@de.ibm.com>
hvc_console: rework setup to replace irq functions with callbacks
introduced a spinlock recursion problem.
request_irq tries to call the handler if the IRQ is shared.
The irq handler of hvc_console calls hvc_poll and hvc_kill
which might take the hvc_struct spinlock. Therefore, we have
to call request_irq outside the spinlock.
We can move the notifier_add safely outside the spinlock as ->data must
not be changed by the backend. Otherwise, tty_hangup would fail anyway.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/hvc_console.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c index 02aac104842d..fd64137b1ab9 100644 --- a/drivers/char/hvc_console.c +++ b/drivers/char/hvc_console.c @@ -322,11 +322,10 @@ static int hvc_open(struct tty_struct *tty, struct file * filp) hp->tty = tty; - if (hp->ops->notifier_add) - rc = hp->ops->notifier_add(hp, hp->data); - spin_unlock_irqrestore(&hp->lock, flags); + if (hp->ops->notifier_add) + rc = hp->ops->notifier_add(hp, hp->data); /* * If the notifier fails we return an error. The tty layer |