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[3.8.y.z,extended,stable] Patch "powerpc/hvsi: Increase handshake timeout from 200ms to 400ms." has been added to staging queue

Message ID 1378414183-15413-1-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa Sept. 5, 2013, 8:49 p.m. UTC
This is a note to let you know that I have just added a patch titled

    powerpc/hvsi: Increase handshake timeout from 200ms to 400ms.

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.9.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

From 0d09499652114bd53ac23e887ab1e0f60cc0309b Mon Sep 17 00:00:00 2001
From: Eugene Surovegin <ebs@ebshome.net>
Date: Mon, 26 Aug 2013 11:53:32 -0700
Subject: powerpc/hvsi: Increase handshake timeout from 200ms to 400ms.

commit d220980b701d838560a70de691b53be007e99e78 upstream.

This solves a problem observed in kexec'ed kernel where 200ms timeout is
too short and bootconsole fails to initialize. Console did eventually
become workable but much later into the boot process.

Observed timeout was around 260ms, but I decided to make it a little bigger
for more reliability.

This has been tested on Power7 machine with Petitboot as a primary
bootloader and PowerNV firmware.

Signed-off-by: Eugene Surovegin <surovegin@google.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/tty/hvc/hvsi_lib.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--
1.8.1.2
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Patch

diff --git a/drivers/tty/hvc/hvsi_lib.c b/drivers/tty/hvc/hvsi_lib.c
index 3396eb9..ac27671 100644
--- a/drivers/tty/hvc/hvsi_lib.c
+++ b/drivers/tty/hvc/hvsi_lib.c
@@ -341,8 +341,8 @@  void hvsilib_establish(struct hvsi_priv *pv)

 	pr_devel("HVSI@%x:   ... waiting handshake\n", pv->termno);

-	/* Try for up to 200s */
-	for (timeout = 0; timeout < 20; timeout++) {
+	/* Try for up to 400ms */
+	for (timeout = 0; timeout < 40; timeout++) {
 		if (pv->established)
 			goto established;
 		if (!hvsi_get_packet(pv))