[ 08/15] serial: 8250, increase PASS_LIMIT

Greg Kroah-Hartman
2013-01-24T21:19:59Z

From: Jiri Slaby <jirislaby@gmail.com>

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 <jirislaby@gmail.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Ram Gupta <ram.gupta5@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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)