This is a note to let you know that I've just added the patch titled
posix-clock: Fix return code on the poll method's error path
to the 3.10-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:
posix-clock-fix-return-code-on-the-poll-method-s-error-path.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1b9f23727abb92c5e58f139e7d180befcaa06fe0 Mon Sep 17 00:00:00 2001
From: Richard Cochran <richardcochran@xxxxxxxxx>
Date: Tue, 22 Dec 2015 22:19:58 +0100
Subject: posix-clock: Fix return code on the poll method's error path
From: Richard Cochran <richardcochran@xxxxxxxxx>
commit 1b9f23727abb92c5e58f139e7d180befcaa06fe0 upstream.
The posix_clock_poll function is supposed to return a bit mask of
POLLxxx values. However, in case the hardware has disappeared (due to
hot plugging for example) this code returns -ENODEV in a futile
attempt to throw an error at the file descriptor level. The kernel's
file_operations interface does not accept such error codes from the
poll method. Instead, this function aught to return POLLERR.
The value -ENODEV does, in fact, contain the POLLERR bit (and almost
all the other POLLxxx bits as well), but only by chance. This patch
fixes code to return a proper bit mask.
Credit goes to Markus Elfring for pointing out the suspicious
signed/unsigned mismatch.
Reported-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
igned-off-by: Richard Cochran <richardcochran@xxxxxxxxx>
Cc: John Stultz <john.stultz@xxxxxxxxxx>
Cc: Julia Lawall <julia.lawall@xxxxxxx>
Link: http://lkml.kernel.org/r/1450819198-17420-1-git-send-email-richardcochran@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/time/posix-clock.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -69,10 +69,10 @@ static ssize_t posix_clock_read(struct f
static unsigned int posix_clock_poll(struct file *fp, poll_table *wait)
{
struct posix_clock *clk = get_posix_clock(fp);
- int result = 0;
+ unsigned int result = 0;
if (!clk)
- return -ENODEV;
+ return POLLERR;
if (clk->ops.poll)
result = clk->ops.poll(clk, fp, wait);
Patches currently in stable-queue which might be from richardcochran@xxxxxxxxx are
queue-3.10/posix-clock-fix-return-code-on-the-poll-method-s-error-path.patch
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