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authorHaitao Zhang <minipanda@linuxrobot.org>2012-01-01 11:30:06 +0800
committerVinod Koul <vinod.koul@linux.intel.com>2012-01-06 11:31:56 +0530
commitf69f2e264f6388df6d3cae45dd67ddfd52aaa14b (patch)
tree27c736df90bf30d31d69ec6e8263f3e26b869291 /drivers/dma
parente9f3a49c9698da6f6b606d5e048ddce308438763 (diff)
downloadop-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/dma')
-rw-r--r--drivers/dma/imx-sdma.c5
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;
}
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