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SubjectRe: [PATCH][next] dmaengine: dw-axi-dmac: remove redundant null check on desc
On 04-02-21, 00:18, Sia, Jee Heng wrote:
> The code looks good to me. I have also verified it on Intel KeemBay platform.
>
> Reviewed-by: Sia Jee Heng <jee.heng.sia@intel.com>
> Tested-by: Sia Jee Heng <jee.heng.sia@intel.com>

Please *do not* top post!

>
> Thanks
> Regards
> Jee Heng
> > -----Original Message-----
> > From: Colin King <colin.king@canonical.com>
> > Sent: 03 February 2021 9:47 PM
> > To: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>; Vinod Koul
> > <vkoul@kernel.org>; Sia, Jee Heng <jee.heng.sia@intel.com>; Andy
> > Shevchenko <andriy.shevchenko@linux.intel.com>;
> > dmaengine@vger.kernel.org
> > Cc: kernel-janitors@vger.kernel.org; linux-kernel@vger.kernel.org
> > Subject: [PATCH][next] dmaengine: dw-axi-dmac: remove redundant
> > null check on desc
> >
> > From: Colin Ian King <colin.king@canonical.com>
> >
> > The pointer desc is being null checked twice, the second null check is
> > redundant because desc has not been re-assigned between the checks.
> > Remove the redundant second null check on desc.
> >
> > Addresses-Coverity: ("Logically dead code")
> > Fixes: ef6fb2d6f1ab ("dmaengine: dw-axi-dmac: simplify descriptor
> > management")
> > Signed-off-by: Colin Ian King <colin.king@canonical.com>
> > ---
> > drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 4 ----
> > 1 file changed, 4 deletions(-)
> >
> > diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> > b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> > index ac3d81b72a15..d9e4ac3edb4e 100644
> > --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> > +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> > @@ -919,10 +919,6 @@ dma_chan_prep_dma_memcpy(struct
> > dma_chan *dchan, dma_addr_t dst_adr,
> > num++;
> > }
> >
> > - /* Total len of src/dest sg == 0, so no descriptor were
> > allocated */
> > - if (unlikely(!desc))
> > - return NULL;
> > -
> > /* Set end-of-link to the last link descriptor of list */
> > set_desc_last(&desc->hw_desc[num - 1]);
> > /* Managed transfer list */
> > --
> > 2.29.2
>

--
~Vinod

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