From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Fri, 29 May 2015 01:19:17 +0000 (-0700)
Subject: f2fs: fix a deadlock for summary page lock vs. sentry_lock
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~156^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9236cac5666ea8b3a3b92b132a046c200b99dca8;p=pandora-kernel.git

f2fs: fix a deadlock for summary page lock vs. sentry_lock

In f2fs_gc:                      In f2fs_replace_block:
 - lock_page(sum_page)
  - check_valid_map()            - mutex_lock(sentry_lock)
   - mutex_lock(sentry_lock)     - change_curseg()
                                  - lock_page(sum_page)

This patch fixes the deadlock condition.

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