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iwlagn: avoid sleep in softirq context

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__ieee80211_tasklet_handler -> __ieee80211_rx ->
	__ieee80211_rx_handle_packet -> ieee80211_invoke_rx_handlers ->
	ieee80211_rx_h_decrypt -> ieee80211_crypto_tkip_decrypt ->
	ieee80211_tkip_decrypt_data -> iwl4965_mac_update_tkip_key ->
	iwl_scan_cancel_timeout -> msleep

Ooops!

Avoid the sleep by changing iwl_scan_cancel_timeout with
iwl_scan_cancel and simply returning on failure if the scan persists.
This will cause hardware decryption to fail and we'll handle a few more
frames with software decryption.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
John W. Linville 2008-10-30 14:12:21 -04:00
parent 502c12e1ef
commit 964d277743
1 changed files with 5 additions and 1 deletions
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6
drivers/net/wireless/iwlwifi/iwl-agn.c
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@ -3252,7 +3252,11 @@ static void iwl4965_mac_update_tkip_key(struct ieee80211_hw *hw,
return;
}
iwl_scan_cancel_timeout(priv, 100);
if (iwl_scan_cancel(priv)) {
/* cancel scan failed, just live w/ bad key and rely
briefly on SW decryption */
return;
}
key_flags |= (STA_KEY_FLG_TKIP | STA_KEY_FLG_MAP_KEY_MSK);
key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);