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| author | Simon Guinot <sguinot@lacie.com> | 2010-09-17 23:33:51 +0200 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2010-09-23 14:14:22 -0700 |
| commit | cc60f8878eab892c03d06b10f389232b9b66bd83 (patch) | |
| tree | 1f2cc0671c1f84c8928c261700f370771d510cbb | |
| parent | d3f3cf859db17cc5f8156c5bfcd032413e44483b (diff) | |
| download | linux-stable-cc60f8878eab892c03d06b10f389232b9b66bd83.tar.gz linux-stable-cc60f8878eab892c03d06b10f389232b9b66bd83.tar.bz2 linux-stable-cc60f8878eab892c03d06b10f389232b9b66bd83.zip | |
dmaengine: fix interrupt clearing for mv_xor
When using simultaneously the two DMA channels on a same engine, some
transfers are never completed. For example, an endless lock can occur
while writing heavily on a RAID5 array (with async-tx offload support
enabled).
Note that this issue can also be reproduced by using the DMA test
client.
On a same engine, the interrupt cause register is shared between two
DMA channels. This patch make sure that the cause bit is only cleared
for the requested channel.
Signed-off-by: Simon Guinot <sguinot@lacie.com>
Tested-by: Luc Saillard <luc@saillard.org>
Acked-by: saeed bishara <saeed.bishara@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
| -rw-r--r-- | drivers/dma/mv_xor.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c index 86c5ae9fde34..411d5bf50fc4 100644 --- a/drivers/dma/mv_xor.c +++ b/drivers/dma/mv_xor.c @@ -162,7 +162,7 @@ static int mv_is_err_intr(u32 intr_cause) static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan) { - u32 val = (1 << (1 + (chan->idx * 16))); + u32 val = ~(1 << (chan->idx * 16)); dev_dbg(chan->device->common.dev, "%s, val 0x%08x\n", __func__, val); __raw_writel(val, XOR_INTR_CAUSE(chan)); } |