libata: clear ering on resume
Error timestamps are in jiffies which doesn't run while suspended and PHY events during resume isn't too uncommon. When the two are combined, it can lead to unnecessary speed downs if the machine is suspended and resumed repeatedly. Clear error history on resume. This was reported and verified in bnc#486803 by Vladimir Botka. Signed-off-by: NTejun Heo <tj@kernel.org> Reported-by: NVladimir Botka <vbotka@novell.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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