641074dd
parent cda31e10baf47a8a7d9360d9488fb76294be1ca3
author Christian Riesch <christian.riesch@omicron.at> 1334550925 +0000
committer David S. Miller <davem@davemloft.net> 1334716319 -0400

davinci_mdio: Fix MDIO timeout check

Under heavy load (flood ping) it is possible for the MDIO timeout to
expire before the loop checks the GO bit again. This patch adds an
additional check whether the operation was done before actually
returning -ETIMEDOUT.

To reproduce this bug, flood ping the device, e.g., ping -f -l 1000
After some time, a "timed out waiting for user access" warning
may appear. And even worse, link may go down since the PHY reported a
timeout.

Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Cc: <stable@vger.kernel.org>
Cc: Cyril Chemparathy <cyril@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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