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| author | Haitao Zhang <minipanda@linuxrobot.org> | 2012-01-01 11:30:06 +0800 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@linux.intel.com> | 2012-01-06 11:31:56 +0530 |
| commit | f69f2e264f6388df6d3cae45dd67ddfd52aaa14b (patch) | |
| tree | 27c736df90bf30d31d69ec6e8263f3e26b869291 /drivers | |
| parent | e9f3a49c9698da6f6b606d5e048ddce308438763 (diff) | |
| download | op-kernel-dev-f69f2e264f6388df6d3cae45dd67ddfd52aaa14b.zip op-kernel-dev-f69f2e264f6388df6d3cae45dd67ddfd52aaa14b.tar.gz | |
dma/imx-sdma: save irq flags when use spin_lock in sdma_tx_submit
mx53_loco: fix deadlock report from sdma_tx_submit() during boot
BugLink: http://bugs.launchpad.net/bugs/878701
Adjust to use spin_lock_irqsave()/spin_unlock_irqresotre(), so to
make it safe when called from interrupt context.
Signed-off-by: Haitao Zhang <haitao.zhang@linaro.org>
Signed-off-by: Eric Miao <eric.miao@linaro.org>
Signed-off-by: Richard Zhao <richard.zhao@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/imx-sdma.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index f59fd8f..a8af379 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -836,17 +836,18 @@ static struct sdma_channel *to_sdma_chan(struct dma_chan *chan) static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx) { + unsigned long flags; struct sdma_channel *sdmac = to_sdma_chan(tx->chan); struct sdma_engine *sdma = sdmac->sdma; dma_cookie_t cookie; - spin_lock_irq(&sdmac->lock); + spin_lock_irqsave(&sdmac->lock, flags); cookie = sdma_assign_cookie(sdmac); sdma_enable_channel(sdma, sdmac->channel); - spin_unlock_irq(&sdmac->lock); + spin_unlock_irqrestore(&sdmac->lock, flags); return cookie; } |
