diff options
| author | Lothar Waßmann <LW@KARO-electronics.de> | 2011-12-08 09:15:43 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@linux.intel.com> | 2011-12-23 20:54:55 +0530 |
| commit | 6d23ea4b1906f28f5d99ad6aeef7207c48be6bfd (patch) | |
| tree | d448c976c70aa3bf028fb9cf8c91a7b7f046129d | |
| parent | feb397de65c3f76e40ef70e264f2cdf688c850c1 (diff) | |
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>
| -rw-r--r-- | drivers/dma/mxs-dma.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c index b0e6ac3e09a..1b4c6be3aac 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; |