From: Johan Rudholm <johan.rudholm@stericsson.com>
Date: Wed, 23 Nov 2011 08:05:58 +0000 (+0100)
Subject: mmc: core: check for zero length ioctl data
X-Git-Tag: v3.2.9~59
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f3d763847f78da07fb82f6d9e8242875cf6995d3;p=pandora-kernel.git

mmc: core: check for zero length ioctl data

commit 4d6144de8ba263eb3691a737c547e5b2fdc45287 upstream.

If the read or write buffer size associated with the command sent
through the mmc_blk_ioctl is zero, do not prepare data buffer.

This enables a ioctl(2) call to for instance send a MMC_SWITCH to set
a byte in the ext_csd.

Signed-off-by: Johan Rudholm <johan.rudholm@stericsson.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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