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 b0ff4792546eef1509a2787b120800445711180b..82573cadb1abf34b28a2c603792474f9f020f0c9 100644 (file)
--- 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