From: Sujith <Sujith.Manoharan@atheros.com>
Date: Mon, 9 Mar 2009 04:02:01 +0000 (+0530)
Subject: ath9k: Fix bug in reading debugfs file 'rcstat'
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=62b4fb66c5611c4e2b9279810c2d037fb5b5fa68;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

ath9k: Fix bug in reading debugfs file 'rcstat'

The rate table would not have been chosen before the interface
has been brought up. Reading 'rcstat' in this case would result
in an oops, fix this.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/drivers/net/wireless/ath9k/debug.c b/drivers/net/wireless/ath9k/debug.c
index b0ff4792546e..82573cadb1ab 100644
--- a/drivers/net/wireless/ath9k/debug.c
+++ b/drivers/net/wireless/ath9k/debug.c
@@ -322,6 +322,9 @@ static ssize_t read_file_rcstat(struct file *file, char __user *user_buf,
 {
 	struct ath_softc *sc = file->private_data;
 
+	if (sc->cur_rate_table == NULL)
+		return 0;
+
 	if (conf_is_ht(&sc->hw->conf))
 		return ath_read_file_stat_11n_rc(file, user_buf, count, ppos);
 	else