From: Jonathan Brassow Date: Thu, 7 Mar 2013 22:22:01 +0000 (-0600) Subject: MD RAID5: Avoid accessing gendisk or queue structs when not available X-Git-Tag: v3.9-rc4~2^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e3620a3ad52609f64a2402e4b59300afb4b83b77;p=pandora-kernel.git MD RAID5: Avoid accessing gendisk or queue structs when not available MD RAID5: Fix kernel oops when RAID4/5/6 is used via device-mapper Commit a9add5d (v3.8-rc1) added blktrace calls to the RAID4/5/6 driver. However, when device-mapper is used to create RAID4/5/6 arrays, the mddev->gendisk and mddev->queue fields are not setup. Therefore, calling things like trace_block_bio_remap will cause a kernel oops. This patch conditionalizes those calls on whether the proper fields exist to make the calls. (Device-mapper will call trace_block_bio_remap on its own.) This patch is suitable for the 3.8.y stable kernel. Cc: stable@vger.kernel.org (v3.8+) Signed-off-by: Jonathan Brassow Signed-off-by: NeilBrown --- Reading git-diff-tree failed