This is a note to let you know that I've just added the patch titled
xtensa: ISS: don't hang if stdin EOF is reached
to the 4.4-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:
xtensa-iss-don-t-hang-if-stdin-eof-is-reached.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 362014c8d9d51d504c167c44ac280169457732be Mon Sep 17 00:00:00 2001
From: Max Filippov <jcmvbkbc@xxxxxxxxx>
Date: Tue, 9 Feb 2016 01:02:38 +0300
Subject: xtensa: ISS: don't hang if stdin EOF is reached
From: Max Filippov <jcmvbkbc@xxxxxxxxx>
commit 362014c8d9d51d504c167c44ac280169457732be upstream.
Simulator stdin may be connected to a file, when its end is reached
kernel hangs in infinite loop inside rs_poll, because simc_poll always
signals that descriptor 0 is readable and simc_read always returns 0.
Check simc_read return value and exit loop if it's not positive. Also
don't rewind polling timer if it's zero.
Signed-off-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/xtensa/platforms/iss/console.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/arch/xtensa/platforms/iss/console.c
+++ b/arch/xtensa/platforms/iss/console.c
@@ -100,21 +100,23 @@ static void rs_poll(unsigned long priv)
{
struct tty_port *port = (struct tty_port *)priv;
int i = 0;
+ int rd = 1;
unsigned char c;
spin_lock(&timer_lock);
while (simc_poll(0)) {
- simc_read(0, &c, 1);
+ rd = simc_read(0, &c, 1);
+ if (rd <= 0)
+ break;
tty_insert_flip_char(port, c, TTY_NORMAL);
i++;
}
if (i)
tty_flip_buffer_push(port);
-
-
- mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
+ if (rd)
+ mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
spin_unlock(&timer_lock);
}
Patches currently in stable-queue which might be from jcmvbkbc@xxxxxxxxx are
queue-4.4/xtensa-iss-don-t-hang-if-stdin-eof-is-reached.patch
queue-4.4/xtensa-clear-all-dbreakc-registers-on-start.patch
queue-4.4/xtensa-fix-preemption-in-clear-copy-_user_highpage.patch
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