From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Wed, 29 Oct 2014 21:37:22 +0000 (-0700)
Subject: f2fs: avoid race condition in handling wait_io
X-Git-Tag: omap-for-v3.19/fixes-rc1~146^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a8f8ca582a1bafe6b620e000316206c8719f1d0;p=pandora-kernel.git

f2fs: avoid race condition in handling wait_io

__submit_merged_bio    f2fs_write_end_io        f2fs_write_end_io
                       wait_io = X              wait_io = x
                       complete(X)              complete(X)
                       wait_io = NULL
wait_for_completion()
free(X)
                                                 spin_lock(X)
                                                 kernel panic

In order to avoid this, this patch removes the wait_io facility.
Instead, we can use wait_on_all_pages_writeback(sbi) to wait for end_ios.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

Reading git-diff-tree failed