tree 58f627bcf74087f8b1417a7fad590b7b3c6a690b
parent 0450254e832c40401c074c84e664d2f37bae7155
author Robert Richter <rrichter@marvell.com> 1557830949 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1580132794 +0100

EDAC/mc: Fix edac_mc_find() in case no device is found

[ Upstream commit 29a0c843973bc385918158c6976e4dbe891df969 ]

The function should return NULL in case no device is found, but it
always returns the last checked mc device from the list even if the
index did not match. Fix that.

I did some analysis why this did not raise any issues for about 3 years
and the reason is that edac_mc_find() is mostly used to search for
existing devices. Thus, the bug is not triggered.

 [ bp: Drop the if (mci->mc_idx > idx) test in favor of readability. ]

Fixes: c73e8833bec5 ("EDAC, mc: Fix locking around mc_devices list")
Signed-off-by: Robert Richter <rrichter@marvell.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lkml.kernel.org/r/20190514104838.15065-1-rrichter@marvell.com
Signed-off-by: Sasha Levin <sashal@kernel.org>