From: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Date: Mon, 2 Dec 2013 17:52:10 +0000 (+0100)
Subject: [SCSI] st: fix enlarge_buffer
X-Git-Tag: v3.14-rc1~131^2^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=769989a4a09d7c825e182cf60604c06d8f2f70e4;p=pandora-kernel.git

[SCSI] st: fix enlarge_buffer

This patch removes a bug in enlarge_buffer() that can make a
read or write fail under special conditions.

After changing TRY_DIRECT_IO to 0 and ST_MAX_SG to 32 in
st_options.h, a program that writes a first block of 128k and
than a second bigger block (e.g. 256k) fails. The second write
returns errno EOVERFLOW, as enlarge_buffer() checks the sg list
and detects that it already is full.
As enlarge_buffer uses different page allocation orders
depending on the size of the buffer needed, the check does not
make sense.

Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Acked-by: Kai Mäkisara <kai.makisara@kolumbus.fi>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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