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Message-ID: <20210104123848.GG120946@vkoul-mobl>
Date: Mon, 4 Jan 2021 18:08:48 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
Dan Williams <dan.j.williams@...el.com>,
linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: qcom: fix gpi undefined behavior
On 03-01-21, 14:57, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> gcc points out an incorrect error handling loop:
>
> drivers/dma/qcom/gpi.c: In function 'gpi_ch_init':
> drivers/dma/qcom/gpi.c:1254:15: error: iteration 2 invokes undefined behavior [-Werror=aggressive-loop-optimizations]
> 1254 | struct gpii *gpii = gchan->gpii;
> | ^~~~
> drivers/dma/qcom/gpi.c:1951:2: note: within this loop
> 1951 | for (i = i - 1; i >= 0; i++) {
> | ^~~
>
> Change the loop to correctly walk backwards through the
> initialized fields rather than off into the woods.
Applied, thanks
--
~Vinod
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