From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Date: Wed, 21 Mar 2007 09:07:05 +0000 (+0200)
Subject: [JFFS2] fix deadlock on error path
X-Git-Tag: v2.6.22-rc1~1116^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0afbbec4981417f79e05865a36e57abfc289002;p=pandora-kernel.git

[JFFS2] fix deadlock on error path

When the MTD driver returns write failure, the following deadlock
occurs:

We are in __jffs2_flush_wbuf(), we hold &c->wbuf_sem. Write failure.
jffs2_wbuf_recover()->jffs2_reserve_space_gc()->jffs2_do_reserve_space()
->jffs2_erase_pending_blocks()->jffs2_flash_read()

and it tries to lock &c->wbuf_sem again. Deadlock.

Reported-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
---

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