From: Stanislaw Gruszka <stf_xl@wp.pl>
Date: Sat, 16 Mar 2013 18:19:29 +0000 (+0100)
Subject: rt2800: do not crash if spec->channels is NULL
X-Git-Tag: v3.10-rc2~34^2~21^2^2~262
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=53216d6a9a2dd3b0a65203e540b7739c36351d55;p=platform%2Fkernel%2Flinux-3.10.git

rt2800: do not crash if spec->channels is NULL

In case the spec->channels was not specified, print warning instead
of hard crash the kernel.

Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Tested-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index a658b4b..182e598 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -5213,6 +5213,9 @@ static int rt2800_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
 		spec->channels = rf_vals_3x;
 	}
 
+	if (WARN_ON_ONCE(!spec->channels))
+		return -ENODEV;
+
 	/*
 	 * Initialize HT information.
 	 */