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Date: Tue, 23 May 2017 09:33:25 +0200 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: Krzysztof Kozlowski <krzk@...nel.org> Cc: "Gustavo A. R. Silva" <garsilva@...eddedor.com>, Kukjin Kim <kgene@...nel.org>, Andi Shyti <andi.shyti@...sung.com>, Mark Brown <broonie@...nel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-samsung-soc@...r.kernel.org" <linux-samsung-soc@...r.kernel.org>, linux-spi <linux-spi@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] spi: add null check before pointer dereference On Tue, May 23, 2017 at 9:24 AM, Krzysztof Kozlowski <krzk@...nel.org> wrote: > On Tue, May 23, 2017 at 2:25 AM, Gustavo A. R. Silva > <garsilva@...eddedor.com> wrote: >> Add null check before dereferencing pointer desc >> >> Addresses-Coverity-ID: 1397997 >> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com> >> --- >> drivers/spi/spi-s3c64xx.c | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c >> index b392cca..9f1013e 100644 >> --- a/drivers/spi/spi-s3c64xx.c >> +++ b/drivers/spi/spi-s3c64xx.c >> @@ -306,6 +306,12 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma, >> desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents, >> dma->direction, DMA_PREP_INTERRUPT); >> >> + if (!desc) { >> + dev_err(&sdd->master->dev, >> + "%s:dmaengine_prep_slave_sg Failed\n", __func__); >> + return; >> + } > > Although the check itself looks needed, but I think you did not handle > the error at all. You just bail out before submitting dma descriptor > but except that, everything else goes like there was no error. It > might work, might not... did you test this error path? How does it > behave? I.e. does it fall back to PIO? Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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