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libata: don't consider 0xff as port empty if SStatus is available 

Some SATA controllers (sata_sil) use 0xff to indicate port not ready
status, not port empty.  As libata interprets 0xff as port empty, this
causes unnecessary reset failure and retry.  Don't consider 0xff as
port empty if SStatus is available and indicates that port is online.

Signed-off-by: tejun Heo <htejun@gmail.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Indan Zupancic <indan@nul.nu>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-05-23 11:22:15 +02:00 committed by Jeff Garzik
parent b33620f9fa
commit fd7fe70161
1 changed files with 1 additions and 1 deletions
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2
drivers/ata/libata-core.c
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@ -3022,7 +3022,7 @@ int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
if (!(status & ATA_BUSY))
return 0;
if (status == 0xff)
if (!ata_port_online(ap) && status == 0xff)
return -ENODEV;
if (time_after(now, deadline))
return -EBUSY;