From: Michael S. Tsirkin Date: Thu, 12 Jan 2012 05:14:44 +0000 (+1030) Subject: virtio_blk: fix config handler race X-Git-Tag: v3.2.29~12 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0984c4c423da091cf8221e74b030c116d865dacf;p=pandora-kernel.git virtio_blk: fix config handler race commit 4678d6f970c2f7c0cbfefc0cc666432d153b321b upstream. Fix a theoretical race related to config work handler: a config interrupt might happen after we flush config work but before we reset the device. It will then cause the config work to run during or after reset. Two problems with this: - if this runs after device is gone we will get use after free - access of config while reset is in progress is racy (as layout is changing). As a solution 1. flush after reset when we know there will be no more interrupts 2. add a flag to disable config access before reset Signed-off-by: Michael S. Tsirkin Signed-off-by: Rusty Russell Signed-off-by: Ben Hutchings --- Reading git-diff-tree failed