This is a note to let you know that I've just added the patch titled
genirq: Set the irq thread policy without checking CAP_SYS_NICE
to the 3.12-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:
genirq-set-the-irq-thread-policy-without-checking-cap_sys_nice.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From bbfe65c219c638e19f1da5adab1005b2d68ca810 Mon Sep 17 00:00:00 2001
From: Thomas Pfaff <[email protected]>
Date: Fri, 11 Oct 2013 13:00:40 +0200
Subject: genirq: Set the irq thread policy without checking CAP_SYS_NICE
From: Thomas Pfaff <[email protected]>
commit bbfe65c219c638e19f1da5adab1005b2d68ca810 upstream.
In commit ee23871389 ("genirq: Set irq thread to RT priority on
creation") we moved the assigment of the thread's priority from the
thread's function into __setup_irq(). That function may run in user
context for instance if the user opens an UART node and then driver
calls requests in the ->open() callback. That user may not have
CAP_SYS_NICE and so the irq thread won't run with the SCHED_OTHER
policy.
This patch uses sched_setscheduler_nocheck() so we omit the CAP_SYS_NICE
check which is otherwise required for the SCHED_OTHER policy.
[bigeasy: Rewrite the changelog]
Signed-off-by: Thomas Pfaff <[email protected]>
Cc: Ivo Sieben <[email protected]>
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/irq/manage.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -956,7 +956,7 @@ __setup_irq(unsigned int irq, struct irq
goto out_mput;
}
- sched_setscheduler(t, SCHED_FIFO, ¶m);
+ sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m);
/*
* We keep the reference to the task struct even if
Patches currently in stable-queue which might be from [email protected] are
queue-3.12/genirq-set-the-irq-thread-policy-without-checking-cap_sys_nice.patch
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