iwlwifi: check for valid band for channel info
when display channel info in debugfs, always check for valid band before access the pointer and display information for 1000 NIC, it only support "bgn" mode, so there is no 5.2GHz channels available to display. Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>hifive-unleashed-5.1
parent
086ed117c9
commit
a2e2322d83
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@ -380,6 +380,7 @@ static ssize_t iwl_dbgfs_channels_read(struct file *file, char __user *user_buf,
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}
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supp_band = iwl_get_hw_mode(priv, IEEE80211_BAND_2GHZ);
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if (supp_band) {
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channels = supp_band->channels;
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pos += scnprintf(buf + pos, bufsz - pos,
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@ -401,8 +402,9 @@ static ssize_t iwl_dbgfs_channels_read(struct file *file, char __user *user_buf,
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channels[i].flags &
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IEEE80211_CHAN_PASSIVE_SCAN ?
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"passive only" : "active/passive");
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}
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supp_band = iwl_get_hw_mode(priv, IEEE80211_BAND_5GHZ);
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if (supp_band) {
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channels = supp_band->channels;
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pos += scnprintf(buf + pos, bufsz - pos,
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@ -424,6 +426,7 @@ static ssize_t iwl_dbgfs_channels_read(struct file *file, char __user *user_buf,
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channels[i].flags &
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IEEE80211_CHAN_PASSIVE_SCAN ?
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"passive only" : "active/passive");
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}
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ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
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kfree(buf);
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return ret;
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