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Can you try the following patch. I think it must solve the first part of
your PR.

More investigation are needed for other parts.

Take cares.

-- 
Arnaud Degroote
degroote@netbsd.org

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Index: if_wpi.c
===================================================================
RCS file: /cvsroot/src/sys/dev/pci/if_wpi.c,v
retrieving revision 1.17
diff -u -r1.17 if_wpi.c
--- if_wpi.c	18 Jul 2007 18:49:16 -0000	1.17
+++ if_wpi.c	2 Aug 2007 23:35:24 -0000
@@ -3003,6 +3016,7 @@
 	uint32_t tmp;
 	int qid, ntries, error;
 
+	wpi_stop(ifp,1);
 	(void)wpi_reset(sc);
 
 	wpi_mem_lock(sc);

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