[PATCH 0/2] staging: tidspbridge: fix dma race condition
From: Felipe Contreras
Date: Mon Dec 20 2010 - 09:26:40 EST
Hi,
I found a race condition that triggers a kernel panic. It's explained in the
following patches, but basically the map_obj that contains the user pages is
being destroyed while doing a DMA operation (which requires that map_obj).
My solution is to convert the spinlock to a semaphore, and exten the area
protected (which might sleep).
I have not tested these specific patches; they have been forward ported. But in
a similar branch, they solve the issue.
Felipe Contreras (2):
staging: tidspbridge: convert dmm_map_lock to sema
staging: tidspbridge: extend dmm_map semaphore
.../staging/tidspbridge/include/dspbridge/drv.h | 2 +-
drivers/staging/tidspbridge/rmgr/drv_interface.c | 2 +-
drivers/staging/tidspbridge/rmgr/proc.c | 23 +++++++++++++-------
3 files changed, 17 insertions(+), 10 deletions(-)
--
1.7.3.3
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