From: Tejun Heo <tj@kernel.org>
To: Jeff Garzik <jeff@garzik.org>,
IDE/ATA development list <linux-ide@vger.kernel.org>
Subject: [PATCH #upstream-fixes] libata: mask off DET when restoring SControl for detach
Date: Mon, 03 Nov 2008 19:27:07 +0900 [thread overview]
Message-ID: <490ED1FB.9080505@kernel.org> (raw)
libata restores SControl on detach; however, trying to restore
non-zero DET can cause undeterministic behavior including PMP device
going offline till power cycling. Mask off DET when restoring
SControl.
Signed-off-by: Tejun Heo <tj@kernel.org>
---
drivers/ata/libata-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: work/drivers/ata/libata-core.c
===================================================================
--- work.orig/drivers/ata/libata-core.c
+++ work/drivers/ata/libata-core.c
@@ -5936,7 +5936,7 @@ static void ata_port_detach(struct ata_p
* to us. Restore SControl and disable all existing devices.
*/
__ata_port_for_each_link(link, ap) {
- sata_scr_write(link, SCR_CONTROL, link->saved_scontrol);
+ sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
ata_link_for_each_dev(dev, link)
ata_dev_disable(dev);
}
next reply other threads:[~2008-11-03 10:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-03 10:27 Tejun Heo [this message]
2008-11-04 6:11 ` [PATCH #upstream-fixes] libata: mask off DET when restoring SControl for detach Jeff Garzik
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