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Message-ID: <20070121222714.GA2473@atjola.homenet> Date: Sun, 21 Jan 2007 23:27:14 +0100 From: Björn Steinbrink <B.Steinbrink@....de> To: Robert Hancock <hancockr@...w.ca> Cc: Jeff Garzik <jeff@...zik.org>, Chr <chunkeey@....de>, Alistair John Strachan <s0348365@....ed.ac.uk>, linux-kernel@...r.kernel.org, htejun@...il.com, jens.axboe@...cle.com, lwalton@...l.com Subject: Re: SATA exceptions with 2.6.20-rc5 On 2007.01.21 13:58:01 -0600, Robert Hancock wrote: > Björn Steinbrink wrote: > >All kernels were bad using that approach. So back to square 1. :/ > > > >Björn > > > > OK guys, here's a new patch to try against 2.6.20-rc5: > > Right now when switching between ADMA mode and legacy mode (i.e. when > going from doing normal DMA reads/writes to doing a FLUSH CACHE) we just > set the ADMA GO register bit appropriately and continue with no delay. > It looks like in some cases the controller doesn't respond to this > immediately, it takes some nanoseconds for the controller's status > registers to reflect the change that was made. It's possible that if we > were trying to issue commands during this time, the controller might not > react properly. This patch adds some code to wait for the status > register to change to the state we asked for before continuing. Just got two exceptions with your patch, none of the debug messages were issued. Björn - 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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