Thomas Gleixner [off-list ref] writes:

From: Thomas Gleixner <redacted>

The completion usage in this driver is interesting:

  - it uses a magic complete function which according to the comment was
    implemented by invoking complete() four times in a row because
    complete_all() was not exported at that time.

  - it uses an open coded wait/poll which checks completion:done. Only one wait
    side (device removal) uses the regular wait_for_completion() interface.

The rationale behind this is to prevent that wait_for_completion() consumes
completion::done which would prevent that all waiters are woken. This is not
necessary with complete_all() as that sets completion::done to UINT_MAX which
is left unmodified by the woken waiters.

Replace the magic complete function with complete_all() and convert the
open coded wait/poll to regular completion interfaces.

This changes the wait to exclusive wait mode. But that does not make any
difference because the wakers use complete_all() which ignores the
exclusive mode.

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <redacted>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kalle Valo <redacted>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-usb@vger.kernel.org
---
V2: New patch to avoid conversion to swait functions later.
---
 drivers/net/wireless/intersil/orinoco/orinoco_usb.c |   21 ++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

I assume this is going via some other than wireless-drivers so:

Acked-by: Kalle Valo <redacted>

-- 
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches