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Message-ID: <129600E5E5FB004392DDC3FB599660D7CB3710B9@irsmsx504.ger.corp.intel.com> Date: Mon, 28 Dec 2009 16:08:47 +0000 From: "Sosnowski, Maciej" <maciej.sosnowski@...el.com> To: "Williams, Dan J" <dan.j.williams@...el.com> CC: "stable@...nel.org" <stable@...nel.org>, "linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: RE: [PATCH 1/3] ioat3: fix p-disabled q-continuation Williams, Dan J wrote: > When continuing a pq calculation the driver needs 3 extra sources. The > driver can perform a 3 source calculation with a single descriptor, but > needs an extended descriptor to process up to 8 sources in one > operation. However, in the p-disabled case only one extra source is > needed. When continuing a p-disabled operation there are occasions > (i.e. 0 < src_cnt % 8 < 3) where the tail operation does not need an > extended descriptor. Properly account for this fact otherwise invalid > 'dmacount' values will be written to hardware usually causing the > channel to halt with 'invalid descriptor' errors. > > Cc: <stable@...nel.org> > Signed-off-by: Dan Williams <dan.j.williams@...el.com> > --- Acked-by: Maciej Sosnowski <maciej.sosnowski@...el.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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