dmaengine: mv_xor_v2: properly handle wrapping in the array of HW descriptors

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commit 2aab4e1815 upstream.

mv_xor_v2_tasklet() is looping over completed HW descriptors. Before the
loop, it initializes 'next_pending_hw_desc' to the first HW descriptor
to handle, and then the loop simply increments this point, without
taking care of wrapping when we reach the last HW descriptor. The
'pending_ptr' index was being wrapped back to 0 at the end, but it
wasn't used in each iteration of the loop to calculate
next_pending_hw_desc.

This commit fixes that, and makes next_pending_hw_desc a variable local
to the loop itself.

Fixes: 19a340b1a8 ("dmaengine: mv_xor_v2: new driver")
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Thomas Petazzoni 2017-05-05 11:57:45 +02:00 • committed by Greg Kroah-Hartman

parent f08c84d4c7

commit 67b1684c4a

1 changed files with 4 additions and 10 deletions

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drivers/dma/mv_xor_v2.c

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