[PATCH 14/24] powerpc/hvsi: Increase handshake timeout from 200ms to 400ms.

Kamal Mostafa kamal at canonical.com
Mon Sep 9 18:45:04 UTC 2013 -stable review patch.  If anyone has any objections, please let me know.


From: Eugene Surovegin <ebs at ebshome.net>

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

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))

More information about the kernel-team mailing list