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| author | Vasily Khoruzhick <anarsoul@gmail.com> | 2011-04-06 17:49:15 +0300 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-04-07 11:17:45 -0700 |
| commit | 850a28ecd8044ef36b2c7699d2e3736a410b4d0a (patch) | |
| tree | 42a67f4ca8a624df752ad790fe0614fa584817d6 /drivers/spi/amba-pl022.c | |
| parent | 454abcc57f1d48a976291bc4af73b5f087e21d70 (diff) | |
| download | linux-850a28ecd8044ef36b2c7699d2e3736a410b4d0a.tar.gz linux-850a28ecd8044ef36b2c7699d2e3736a410b4d0a.tar.bz2 linux-850a28ecd8044ef36b2c7699d2e3736a410b4d0a.zip | |
spi: Fix race condition in stop_queue()
There's a race condition in stop_queue() in some drivers -
if drv_data->queue is empty, but drv_data->busy is still set
(or opposite situation) stop_queue will return -EBUSY.
So fix loop condition to check that both drv_data->queue is empty
and drv_data->busy is not set.
This patch affects following drivers:
pxa2xx_spi
spi_bfin5xx
amba-pl022
dw_spi
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/amba-pl022.c')
| -rw-r--r-- | drivers/spi/amba-pl022.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c index 5a4e0afb9ad6..4b8357b728cb 100644 --- a/drivers/spi/amba-pl022.c +++ b/drivers/spi/amba-pl022.c @@ -1555,7 +1555,7 @@ static int stop_queue(struct pl022 *pl022) * A wait_queue on the pl022->busy could be used, but then the common * execution path (pump_messages) would be required to call wake_up or * friends on every SPI message. Do this instead */ - while (!list_empty(&pl022->queue) && pl022->busy && limit--) { + while ((!list_empty(&pl022->queue) || pl022->busy) && limit--) { spin_unlock_irqrestore(&pl022->queue_lock, flags); msleep(10); spin_lock_irqsave(&pl022->queue_lock, flags); |