From 75f64dd54a185150ebfc45e99351c890d4a2252f Mon Sep 17 00:00:00 2001 From: Ondrej Zary Date: Wed, 23 Jun 2010 12:57:15 +0200 Subject: rt2500usb: fallback to SW encryption for TKIP+AES HW crypto in rt2500usb does not seem to support keys with different ciphers, which breaks TKIP+AES mode. Fall back to software encryption to fix it. This should fix long-standing problems with rt2500usb and WPA, such as: http://rt2x00.serialmonkey.com/phpBB/viewtopic.php?f=4&t=4834 https://bugzilla.redhat.com/show_bug.cgi?id=484888 Also tested that it does not break WEP, TKIP-only and AES-only modes. Signed-off-by: Ondrej Zary Acked-by: Gertjan van Wingerde Signed-off-by: John W. Linville --- drivers/net/wireless/rt2x00/rt2500usb.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c index 002db646ae0b..963238c89080 100644 --- a/drivers/net/wireless/rt2x00/rt2500usb.c +++ b/drivers/net/wireless/rt2x00/rt2500usb.c @@ -347,6 +347,7 @@ static int rt2500usb_config_key(struct rt2x00_dev *rt2x00dev, { u32 mask; u16 reg; + enum cipher curr_cipher; if (crypto->cmd == SET_KEY) { /* @@ -357,6 +358,7 @@ static int rt2500usb_config_key(struct rt2x00_dev *rt2x00dev, mask = TXRX_CSR0_KEY_ID.bit_mask; rt2500usb_register_read(rt2x00dev, TXRX_CSR0, ®); + curr_cipher = rt2x00_get_field16(reg, TXRX_CSR0_ALGORITHM); reg &= mask; if (reg && reg == mask) @@ -365,6 +367,14 @@ static int rt2500usb_config_key(struct rt2x00_dev *rt2x00dev, reg = rt2x00_get_field16(reg, TXRX_CSR0_KEY_ID); key->hw_key_idx += reg ? ffz(reg) : 0; + /* + * Hardware requires that all keys use the same cipher + * (e.g. TKIP-only, AES-only, but not TKIP+AES). + * If this is not the first key, compare the cipher with the + * first one and fall back to SW crypto if not the same. + */ + if (key->hw_key_idx > 0 && crypto->cipher != curr_cipher) + return -EOPNOTSUPP; rt2500usb_register_multiwrite(rt2x00dev, reg, crypto->key, sizeof(crypto->key)); -- cgit v1.2.2