From: Christoph Hellwig <hch@infradead.org>
To: Alexander Egorenkov <egorenar-dev@posteo.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] lib: scatterlist: Fix SGL length in sg_split() if !CONFIG_NEED_SG_DMA_LENGTH
Date: Mon, 19 Apr 2021 10:23:25 +0100 [thread overview]
Message-ID: <20210419092325.GA3215674@infradead.org> (raw)
In-Reply-To: <20210418081441.5040-1-egorenar-dev@posteo.net>
On Sun, Apr 18, 2021 at 08:14:41AM +0000, Alexander Egorenkov wrote:
> If CONFIG_NEED_SG_DMA_LENGTH is NOT enabled then sg_dma_len() is an alias
> for the length field in a SGL. In that case sg_split() wrongly resets
> the length of split SGLs to zero after it was set correctly before.
Why is this routine messing with sg_dma_address and
sg_dma_lensg_dma_lensg_dma_len at all? This whole sg_spli() routine
seems rather dangerous because ownership and state of the DMA mapping is
entirely unclear.
next prev parent reply other threads:[~2021-04-19 9:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-18 8:14 [PATCH 1/1] lib: scatterlist: Fix SGL length in sg_split() if !CONFIG_NEED_SG_DMA_LENGTH Alexander Egorenkov
2021-04-19 9:23 ` Christoph Hellwig [this message]
2021-04-19 14:35 ` Alexander Egorenkov
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