linux-kernel - Re: [PATCH] dma: coh901318: Fix a double-lock bug

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Date:   Wed, 14 Nov 2018 14:36:55 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     baijiaju1990@...il.com
Cc:     vkoul@...nel.org, Dan Williams <dan.j.williams@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        dmaengine@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dma: coh901318: Fix a double-lock bug

On Tue, Nov 6, 2018 at 4:33 AM Jia-Ju Bai <baijiaju1990@...il.com> wrote:

> 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@...il.com>

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij