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rtl8180: avoid NULL dereference in max2820_rf_set_channel

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The static function max2820_rf_set_channel is called with conf == NULL
within its compilation unit.  Originally this defaulted to b/g channel
1, but "cfg80211 API for channels/bitrates, mac80211 and driver
conversion" (commit 8318d78a44) mistakenly
dropped this check.  This patch minimally restores the expected
behavior.

Reported-by: Colin Lai <colin_sh@163.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
John W. Linville 2008-05-27 17:01:55 -04:00
parent 289c79a4bd
commit 6f6c218f68
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wireless/rtl8180_max2820.c
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@ -78,7 +78,8 @@ static void max2820_rf_set_channel(struct ieee80211_hw *dev,
struct ieee80211_conf *conf)
{
struct rtl8180_priv *priv = dev->priv;
int channel = ieee80211_frequency_to_channel(conf->channel->center_freq);
int channel = conf ?
ieee80211_frequency_to_channel(conf->channel->center_freq) : 1;
unsigned int chan_idx = channel - 1;
u32 txpw = priv->channels[chan_idx].hw_value & 0xFF;
u32 chan = max2820_chan[chan_idx];