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ARM: PL08x: fix missed spin-unlock in pl08x_issue_pending() 

pl08x_issue_pending() returns with the spinlock locked and interrupts
disabled if the channel is waiting for a physical DMA to become free.
This is wrong - especially as pl08x_issue_pending() is an API function
as it leads to deadlocks.  Fix it to always return with the spinlock
unlocked.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Russell King - ARM Linux 2011-01-03 22:32:05 +00:00 committed by Dan Williams
parent dafa73171b
commit 9c0bb43bbd
1 changed files with 4 additions and 8 deletions
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12
drivers/dma/amba-pl08x.c
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@ -1294,15 +1294,11 @@ static void pl08x_issue_pending(struct dma_chan *chan)
unsigned long flags;
spin_lock_irqsave(&plchan->lock, flags);
/* Something is already active */
if (plchan->at) {
spin_unlock_irqrestore(&plchan->lock, flags);
return;
}
/* Didn't get a physical channel so waiting for it ... */
if (plchan->state == PL08X_CHAN_WAITING)
/* Something is already active, or we're waiting for a channel... */
if (plchan->at || plchan->state == PL08X_CHAN_WAITING) {
spin_unlock_irqrestore(&plchan->lock, flags);
return;
}
/* Take the first element in the queue and execute it */
if (!list_empty(&plchan->desc_list)) {