From: Joe Perches <joe@perches.com>
To: Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
mchehab@kernel.org, akpm@linux-foundation.org, rppt@kernel.org,
hverkuil-cisco@xs4all.nl
Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: Re: [PATCH 2/2] media: bt8xx: avoid a useless memset
Date: Mon, 27 Jul 2020 09:09:34 -0700 [thread overview]
Message-ID: <0897d9bec8865859694c917f3f72ab8fd12321ff.camel@perches.com> (raw)
In-Reply-To: <20200727135151.54757-1-christophe.jaillet@wanadoo.fr>
On Mon, 2020-07-27 at 15:51 +0200, Christophe JAILLET wrote:
> Avoid a memset after a call to 'dma_alloc_coherent()'.
> This is useless since
> commit 518a2f1925c3 ("dma-mapping: zero memory returned from dma_alloc_*")
[]
> diff --git a/drivers/media/pci/bt8xx/btcx-risc.c b/drivers/media/pci/bt8xx/btcx-risc.c
[]
> @@ -73,7 +73,6 @@ int btcx_riscmem_alloc(struct pci_dev *pci,
> dprintk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
> memcnt, (unsigned long)dma, cpu, size);
> }
> - memset(risc->cpu,0,risc->size);
> return 0;
> }
Likely NAK.
This is not useless as risc->cpu may be reused
and the alloc may not have been done.
next prev parent reply other threads:[~2020-07-27 16:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 13:51 [PATCH 2/2] media: bt8xx: avoid a useless memset Christophe JAILLET
2020-07-27 16:09 ` Joe Perches [this message]
2020-07-27 16:16 ` Joe Perches
2020-07-28 8:05 ` Christophe JAILLET
2020-07-28 9:25 ` Joe Perches
2020-07-28 8:01 ` Christophe JAILLET
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