From: mbizon@freebox.fr (Maxime Bizon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] dma: mv_xor: remove minimal offload length threshold
Date: Thu, 27 Dec 2012 21:15:58 +0100 [thread overview]
Message-ID: <1356639358.28655.7.camel@sakura.staff.proxad.net> (raw)
In-Reply-To: <1356636037-22948-1-git-send-email-lkundrak@v3.sk>
On Thu, 2012-12-27 at 20:20 +0100, Lubomir Rintel wrote:
>
> of memory condition and retries indefinitelly, causing a soft lockup.
> The threshold does not seem to be enforced by hardware (couldn't find
> anything like that in a datasheet)
page 212
Table 63: Descriptor Byte Count Word
3:0 ByteCount
XOR mode: Size of source and destination blocks in bytes.
CRC mode: Size of source block part represented by the descriptor.
DMA mode: Size of source and destination block in bytes.
Minimum blocks' size: 16B.
Maximum blocks' size: 16MB-1
> and things seems to work fine without it. If there's a
my guess is that it transfers 16B so it seems to work but actually
corrupts data.
maybe we should teach net_dma_find_channel() about that limitation
--
Maxime
next prev parent reply other threads:[~2012-12-27 20:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-27 19:20 [PATCH] dma: mv_xor: remove minimal offload length threshold Lubomir Rintel
2012-12-27 19:56 ` Lubomir Rintel
2012-12-27 20:15 ` Maxime Bizon [this message]
2013-01-26 17:30 ` Mario Schuknecht
2012-12-27 21:24 ` Greg KH
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