ipw2200: fix scanning while associated

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This patch fixes sporadic firmware restarts when scanning while associated.

The firmware will quietly cancel a scan (while associated) if the dwell time
for a channel to be scanned is larger than the time it may stay away from the
operating channel (because of DTIM catching). Unfortunately the driver is not
notified about the canceled scan and therefore the scan watchdog timeout will
be hit and the driver causes a firmware restart which results in
disassociation. This mainly happens on passive channels which use a dwell time
of 120 whereas a typical beacon interval is around 100.

The patch changes the dwell time for passive channels to be slightly smaller
than the actual beacon interval to work around the firmware issue. Furthermore
the number of allowed beacon misses is increased from one to three as otherwise
most scans (while associated) won't complete successfully.

However scanning while associated will still fail in corner cases such as a
beacon intervals below 30.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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This commit is contained in:

Helmut Schaa 2008-12-10 13:17:26 +01:00 • committed by John W. Linville

parent d8004cb926

commit 14a4dfe2ff

2 changed files with 23 additions and 6 deletions

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28

drivers/net/wireless/ipw2x00/ipw2200.c

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1

drivers/net/wireless/ipw2x00/ipw2200.h

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