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Message-ID: <4A525FA8.80509@gmail.com> Date: Mon, 06 Jul 2009 16:33:44 -0400 From: "Alan D. Brunelle" <adbrunelle@...il.com> To: Hannes Reinecke <hare@...e.de> CC: Jens Axboe <jens.axboe@...cle.com>, scameron@...rdog.cca.cpqcorp.net, linux-kernel@...r.kernel.org Subject: Re: [PATCH] cciss: Ignore stale commands after reboot Hannes Reinecke wrote: > When doing an unexpected shutdown like kexec the cciss > firmware might still have some commands in flight, which > it is trying to complete. > The driver is doing it's best on resetting the HBA, > but sadly there's a firmware issue causing the firmware > _not_ to abort or drop old commands. > So the firmware will send us commands which we haven't > accounted for, causing the driver to panic. > > With this patch we're just ignoring these commands as > there is nothing we could be doing with them anyway. > > Signed-off-by: Hannes Reinecke <hare@...e.de> Pardon my ignorance here, but don't you have a bigger problem: if the reset is not dropping or aborting old commands, doesn't this also mean that these old commands can still be _executing_? In which case any (old) reads being executed could be scribbling over memory? (Memory that may be being used for other purposes?) Alan D. Brunelle -- 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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