diff options
| author | Tomas Vanek <Tomas.Vanek@fbl.cz> | 2012-02-05 14:51:53 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-02-07 20:43:15 +0100 |
| commit | e81a7bd55531a77d8c16d44766db4089c2983f1b (patch) | |
| tree | e494b01ebfca829bc21493d6598f0622a1c3e717 /drivers/net/wireless/zd1211rw | |
| parent | bcma: don't fail for bad SPROM CRC (diff) | |
| download | linux-e81a7bd55531a77d8c16d44766db4089c2983f1b.tar.xz linux-e81a7bd55531a77d8c16d44766db4089c2983f1b.zip | |
zd1211rw: firmware needs duration_id set to zero for non-pspoll frames
Some devices (iwl5100) cannot connect to zd1211rw based AP. It appears that
zd1211 firmware messes up duration_id field if it is not set to zero by driver.
Sniffing traffic shows that zd1211 is transmitting frames with duration_id bits
14 and 15 set and other bits appearing random. Setting duration_id at driver to
zero results zd1211 outputting sane duration_id. This means that firmware is
setting correct values itself and expects duration_id to be zero in first
place.
Looking at vendor driver shows that only PSPoll frames have duration_id set by
driver, for other frames duration_id left zero.
Original bug-report and attached patch at:
http://sourceforge.net/mailarchive/message.php?msg_id=28759111
Reported-by: Tomas Vanek <Tomas.Vanek@fbl.cz>
[modified original patch from bug-report, added check for pspoll frame]
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/zd1211rw')
| -rw-r--r-- | drivers/net/wireless/zd1211rw/zd_mac.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c index 0a70149df3fc..98a574a4a465 100644 --- a/drivers/net/wireless/zd1211rw/zd_mac.c +++ b/drivers/net/wireless/zd1211rw/zd_mac.c @@ -866,6 +866,14 @@ static int fill_ctrlset(struct zd_mac *mac, ZD_ASSERT(frag_len <= 0xffff); + /* + * Firmware computes the duration itself (for all frames except PSPoll) + * and needs the field set to 0 at input, otherwise firmware messes up + * duration_id and sets bits 14 and 15 on. + */ + if (!ieee80211_is_pspoll(hdr->frame_control)) + hdr->duration_id = 0; + txrate = ieee80211_get_tx_rate(mac->hw, info); cs->modulation = txrate->hw_value; |