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authorLothar Waßmann <LW@KARO-electronics.de>2011-12-08 12:15:43 +0400
committerVinod Koul <vinod.koul@linux.intel.com>2011-12-23 19:24:55 +0400
commit6d23ea4b1906f28f5d99ad6aeef7207c48be6bfd (patch)
treed448c976c70aa3bf028fb9cf8c91a7b7f046129d /drivers/dma/mxs-dma.c
parentfeb397de65c3f76e40ef70e264f2cdf688c850c1 (diff)
downloadlinux-6d23ea4b1906f28f5d99ad6aeef7207c48be6bfd.tar.xz
dma: mxs-dma: make mxs_dma_prep_slave_sg() multi user safe
Using a static variable for counting the number of CCWs attached to a DMA channel when appending a new descriptor is not multi user safe. Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Diffstat (limited to 'drivers/dma/mxs-dma.c')
-rw-r--r--drivers/dma/mxs-dma.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index b0e6ac3e09aa..1b4c6be3aacb 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -111,6 +111,7 @@ struct mxs_dma_chan {
int chan_irq;
struct mxs_dma_ccw *ccw;
dma_addr_t ccw_phys;
+ int desc_count;
dma_cookie_t last_completed;
enum dma_status status;
unsigned int flags;
@@ -386,7 +387,7 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
struct scatterlist *sg;
int i, j;
u32 *pio;
- static int idx;
+ int idx = append ? mxs_chan->desc_count : 0;
if (mxs_chan->status == DMA_IN_PROGRESS && !append)
return NULL;
@@ -462,6 +463,7 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
}
}
}
+ mxs_chan->desc_count = idx;
return &mxs_chan->desc;
@@ -523,6 +525,7 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_dma_cyclic(
i++;
}
+ mxs_chan->desc_count = i;
return &mxs_chan->desc;