From: Jia-Ju Bai baijiaju1990@gmail.com
[ Upstream commit 627469e4445b9b12e0229b3bdf8564d5ce384dd7 ]
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 --- drivers/dma/coh901318.c | 4 ---- 1 file changed, 4 deletions(-)
--- a/drivers/dma/coh901318.c +++ b/drivers/dma/coh901318.c @@ -1802,8 +1802,6 @@ static int coh901318_config(struct coh90 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 coh90 coh901318_set_conf(cohc, p->config); coh901318_set_ctrl(cohc, p->ctrl_lli_last);
- spin_unlock_irqrestore(&cohc->lock, flags); - return 0; }