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dma/imx-sdma: save irq flags when use spin_lock in sdma_tx_submit

Message ID 1325385739-2565-1-git-send-email-richard.zhao@linaro.org
State Superseded
Headers show

Commit Message

Richard Zhao Jan. 1, 2012, 2:42 a.m. UTC 
From: Haitao Zhang <minipanda@linuxrobot.org>

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>
---
 drivers/dma/imx-sdma.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index f993955..2b7a88b 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -832,17 +832,18 @@  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;
 }