This is a note to let you know that I've just added the patch titled
serial: 8250, increase PASS_LIMIT
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-8250-increase-pass_limit.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From e7328ae1848966181a7ac47e8ae6cddbd2cf55f3 Mon Sep 17 00:00:00 2001
From: Jiri Slaby <[email protected]>
Date: Sun, 5 Jun 2011 22:51:49 +0200
Subject: serial: 8250, increase PASS_LIMIT
From: Jiri Slaby <[email protected]>
commit e7328ae1848966181a7ac47e8ae6cddbd2cf55f3 upstream.
With virtual machines like qemu, it's pretty common to see "too much
work for irq4" messages nowadays. This happens when a bunch of output
is printed on the emulated serial console. This is caused by too low
PASS_LIMIT. When ISR loops more than the limit, it spits the message.
I've been using a kernel with doubled the limit and I couldn't see no
problems. Maybe it's time to get rid of the message now?
Signed-off-by: Jiri Slaby <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: Ram Gupta <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/tty/serial/8250.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -81,7 +81,7 @@ static unsigned int skip_txen_test; /* f
#define DEBUG_INTR(fmt...) do { } while (0)
#endif
-#define PASS_LIMIT 256
+#define PASS_LIMIT 512
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/serial-8250-increase-pass_limit.patch
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