From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Date: Wed, 18 May 2011 15:08:05 +0000 (+0300)
Subject: UBI: fix oops in error path
X-Git-Tag: v3.1-rc1~326^2~3
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=01a4110d2b86b05918debf39c50867cbb9598491;p=pandora-kernel.git

UBI: fix oops in error path

This patch fixes an oops in the error path of 'ubi_attach_mtd_dev()'. If
anything after 'uif_init()' fails, we get an oops in 'cancel_pending()'. The
reason is that 'uif_close()' drops the last reference count for 'ubi->dev' and
whole 'struct ubi_device' is freed. And then
'ubi_wl_close()'->'cancel_pending()' tries to access the 'ubi' pointer and
problems begin.

Note, in 'ubi_detach_mtd_dev()' function we get a device reference to
work-around this issue. Do the same in the error path of
'ubi_attach_mtd_dev()'.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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