summaryrefslogtreecommitdiffstats
path: root/drivers/dma
diff options
context:
space:
mode:
authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2017-05-05 11:57:44 +0200
committerVinod Koul <vinod.koul@intel.com>2017-05-14 18:22:08 +0530
commiteb8df543e444492328f506adffc7dfe94111f1bd (patch)
treecea4e75fd4682017869076d94ec57b4832be91da /drivers/dma
parent2ea659a9ef488125eb46da6eb571de5eae5c43f6 (diff)
downloadlinux-eb8df543e444492328f506adffc7dfe94111f1bd.tar.bz2
dmaengine: mv_xor_v2: handle mv_xor_v2_prep_sw_desc() error properly
The mv_xor_v2_prep_sw_desc() is called from a few different places in the driver, but we never take into account the fact that it might return NULL. This commit fixes that, ensuring that we don't panic if there are no more descriptors available. Fixes: 19a340b1a820 ("dmaengine: mv_xor_v2: new driver") Cc: <stable@vger.kernel.org> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/mv_xor_v2.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/dma/mv_xor_v2.c b/drivers/dma/mv_xor_v2.c
index a28a01fcba67..e9280207ac19 100644
--- a/drivers/dma/mv_xor_v2.c
+++ b/drivers/dma/mv_xor_v2.c
@@ -389,6 +389,8 @@ mv_xor_v2_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest,
__func__, len, &src, &dest, flags);
sw_desc = mv_xor_v2_prep_sw_desc(xor_dev);
+ if (!sw_desc)
+ return NULL;
sw_desc->async_tx.flags = flags;
@@ -443,6 +445,8 @@ mv_xor_v2_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
__func__, src_cnt, len, &dest, flags);
sw_desc = mv_xor_v2_prep_sw_desc(xor_dev);
+ if (!sw_desc)
+ return NULL;
sw_desc->async_tx.flags = flags;
@@ -491,6 +495,8 @@ mv_xor_v2_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
container_of(chan, struct mv_xor_v2_device, dmachan);
sw_desc = mv_xor_v2_prep_sw_desc(xor_dev);
+ if (!sw_desc)
+ return NULL;
/* set the HW descriptor */
hw_descriptor = &sw_desc->hw_desc;