From mboxrd@z Thu Jan 1 00:00:00 1970 From: baijiaju1990@gmail.com (Jia-Ju Bai) Date: Tue, 6 Nov 2018 11:33:48 +0800 Subject: [PATCH] dma: coh901318: Fix a double-lock bug Message-ID: <20181106033348.27361-1-baijiaju1990@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- drivers/dma/coh901318.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c index eebaba3d9e78..fd862a478738 100644 --- a/drivers/dma/coh901318.c +++ b/drivers/dma/coh901318.c @@ -1807,8 +1807,6 @@ 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 @@ -1828,8 +1826,6 @@ 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; } -- 2.17.0