From: NeilBrown Date: Thu, 12 Apr 2012 06:05:06 +0000 (+1000) Subject: md/bitmap: prevent bitmap_daemon_work running while initialising bitmap X-Git-Tag: v3.4-rc3~34^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=afbaa90b80b1ec66e5137cc3824746bfdf559b18;p=pandora-kernel.git md/bitmap: prevent bitmap_daemon_work running while initialising bitmap If a bitmap is added while the array is active, it is possible for bitmap_daemon_work to run while the bitmap is being initialised. This is particularly a problem if bitmap_daemon_work sees bitmap->filemap as non-NULL before it has been filled in properly. So hold bitmap_info.mutex while filling in ->filemap to prevent problems. This patch is suitable for any -stable kernel, though it might not apply cleanly before about 3.1. Cc: stable@vger.kernel.org Signed-off-by: NeilBrown --- Reading git-diff-tree failed