[PATCH] d80211: Take lowlevel driver's channel change time into account during scanning.

[PATCH] d80211: Take lowlevel driver's channel change time into account during scanning.

[Gertjan van Wingerde]

Make the dscape stack take the driver-supplied channel change time into 
account when actively scanning for networks.
This particularly has been a problem in the rt2x00 driver, where 
configuration changes are done via a work-queue, and
the subsequent channel changes failed due to the dscape stack scheduling 
a channel update while the previous one had not
been performed yet, resulting in failed scans.

Signed-off-by: Gertjan van Wingerde <gwingerde@kpnplanet.nl>

diff --git a/net/d80211/ieee80211_sta.c b/net/d80211/ieee80211_sta.c
index 37d40aa..9f8653d 100644
--- a/net/d80211/ieee80211_sta.c
+++ b/net/d80211/ieee80211_sta.c
@@ -2503,7 +2503,8 @@ #endif
                        break;
                }

-               local->scan_timer.expires = jiffies + IEEE80211_PROBE_DELAY;
+               local->scan_timer.expires = jiffies + IEEE80211_PROBE_DELAY +
+                             usecs_to_jiffies(local->hw->channel_change_time);
                local->scan_state = SCAN_SEND_PROBE;
                break;
        case SCAN_SEND_PROBE:

Re: [PATCH] d80211: Take lowlevel driver's channel change time into account during scanning.

[Jiri Benc]

On Sat, 01 Jul 2006 22:40:38 +0200, Gertjan van Wingerde wrote:
> Make the dscape stack take the driver-supplied channel change time into 
> account when actively scanning for networks.
> This particularly has been a problem in the rt2x00 driver, where 
> configuration changes are done via a work-queue, and
> the subsequent channel changes failed due to the dscape stack scheduling 
> a channel update while the previous one had not
> been performed yet, resulting in failed scans.

Your mail client converts tabs to spaces. Nevertheless, I applied the
patch to my git tree.

Thanks for fixing this,

 Jiri

-- 
Jiri Benc
SUSE Labs