Re: [PATCH] uio/gen-pci: don't enable interrupts in ISR

From: Sebastian Andrzej Siewior
Date: Wed Aug 10 2011 - 04:33:36 EST

Michael S. Tsirkin wrote:
Let's assume we start with e.g. io enable bit cleared.

user kernel
read config |
set io enable |
| interrupt | read + set interrupt mask
write config back |

We end up with io enable bit cleared. Locking around rmw
that we have fixes this race.

Okay, forgot about the SMP case, sorry.

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