tree 70ae1ffa1622b689350d00aaa052393e4094099f
parent 1d19ecfc65ed01bac7a58f83004057ad704ee7cc
author Lennert Buytenhek <buytenh@wantstofly.org> 1225517540 +0100
committer Jeff Garzik <jgarzik@redhat.com> 1225743795 -0500

mv643xx_eth: fix SMI bus access timeouts

The mv643xx_eth mii bus implementation uses wait_event_timeout() to
wait for SMI completion interrupts.

If wait_event_timeout() would return zero, mv643xx_eth would conclude
that the SMI access timed out, but this is not necessarily true --
wait_event_timeout() can also return zero in the case where the SMI
completion interrupt did happen in time but where it took longer than
the requested timeout for the process performing the SMI access to be
scheduled again.  This would lead to occasional SMI access timeouts
when the system would be under heavy load.

The fix is to ignore the return value of wait_event_timeout(), and
to re-check the SMI done bit after wait_event_timeout() returns to
determine whether or not the SMI access timed out.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>