shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 19:30:30 +09:00
Code Issues Packages Projects Releases Wiki Activity

dmaengine: coh901318: Fix a double-lock bug

Browse Source 
[ Upstream commit 627469e444 ]

The function coh901318_alloc_chan_resources() calls spin_lock_irqsave()
before calling coh901318_config().
But coh901318_config() calls spin_lock_irqsave() again in its
definition, which may cause a double-lock bug.

Because coh901318_config() is only called by
coh901318_alloc_chan_resources(), the bug fix is to remove the
calls to spin-lock and -unlock functions in coh901318_config().

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jia-Ju Bai
2018-11-06 11:33:48 +08:00
committed by Greg Kroah-Hartman
parent 0fe60584b2
commit c3f7d1ceb1
1 changed files with 0 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/dma/coh901318.c
View File

@@ -1802,8 +1802,6 @@ static int coh901318_config(struct coh901318_chan *cohc,
int channel = cohc->id;
void __iomem *virtbase = cohc->base->virtbase;
spin_lock_irqsave(&cohc->lock, flags);
if (param)
p = param;
else
@@ -1823,8 +1821,6 @@ static int coh901318_config(struct coh901318_chan *cohc,
coh901318_set_conf(cohc, p->config);
coh901318_set_ctrl(cohc, p->ctrl_lli_last);
spin_unlock_irqrestore(&cohc->lock, flags);
return 0;
}