On Mon, 17 Oct 2011 11:46:06 -0700 ebiederm@xxxxxxxxxxxx (Eric W. Biederman) wrote: > > I traced a nasty kexec on panic boot failure to the fact that we had > screaming msi interrupts and we were not disabling the msi messages at > kernel startup. The booting kernel had not enabled those interupts so > was not prepared to handle them. > > I can see no reason why we would ever want to leave the msi interrupts > enabled at boot if something else has enabled those interrupts. The pci > spec specifies that msi interrupts should be off by default. Drivers > are expected to enable the msi interrupts if they want to use them. Our > interrupt handling code reprograms the interrupt handlers at boot and > will not be be able to do anything useful with an unexpected interrupt. > > This patch applies cleanly all of the way back to 2.6.32 where I noticed > the problem. > > Cc: stable@xxxxxxxxxx > Applied to -next because I'm a chicken. -- Jesse Barnes, Intel Open Source Technology Center
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