Reenabled linux-xen, added patches for Xen Kernel Version 2.6.27.31,

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.drivers / libata-clear-ering-on-resume

diff --git a/src/patches/suse-2.6.27.31/patches.drivers/libata-clear-ering-on-resume b/src/patches/suse-2.6.27.31/patches.drivers/libata-clear-ering-on-resume
new file mode 100644 (file)
index 0000000..07650bd
--- /dev/null
+++ b/src/patches/suse-2.6.27.31/patches.drivers/libata-clear-ering-on-resume
@@ -0,0 +1,47 @@
+From: Tejun Heo <tj@kernel.org>
+Subject: libata: clear ering on resume
+References: bnc#486803
+
+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: Tejun Heo <tj@kernel.org>
+Reported-by: Vladimir Botka <vbotka@novell.com>
+Signed-off-by: Tejun Heo <teheo@suse.de>
+---
+ drivers/ata/libata-eh.c |   13 +++++++++++++
+ 1 file changed, 13 insertions(+)
+
+--- a/drivers/ata/libata-eh.c
++++ b/drivers/ata/libata-eh.c
+@@ -3158,6 +3158,8 @@ static void ata_eh_handle_port_suspend(s
+  */
+ static void ata_eh_handle_port_resume(struct ata_port *ap)
+ {
++      struct ata_link *link;
++      struct ata_device *dev;
+       unsigned long flags;
+       int rc = 0;
+ 
+@@ -3172,6 +3174,17 @@ static void ata_eh_handle_port_resume(st
+ 
+       WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
+ 
++      /*
++       * 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.
++       */
++      ata_port_for_each_link(link, ap)
++              ata_link_for_each_dev(dev, link)
++                      ata_ering_clear(&dev->ering);
++
+       ata_acpi_set_state(ap, PMSG_ON);
+ 
+       if (ap->ops->port_resume)