Patch "genirq: Set the irq thread policy without checking CAP_SYS_NICE" has been added to the 3.12-stable tree

[<gregkh@xxxxxxxxxxxxxxxxxxx>]

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 <stable@xxxxxxxxxxxxxxx> know about it.


>From bbfe65c219c638e19f1da5adab1005b2d68ca810 Mon Sep 17 00:00:00 2001
From: Thomas Pfaff <tpfaff@xxxxxxx>
Date: Fri, 11 Oct 2013 13:00:40 +0200
Subject: genirq: Set the irq thread policy without checking CAP_SYS_NICE

From: Thomas Pfaff <tpfaff@xxxxxxx>

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 <tpfaff@xxxxxxx>
Cc: Ivo Sieben <meltedpianoman@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1381489240-29626-1-git-send-email-bigeasy@xxxxxxxxxxxxx
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 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, &param);
+		sched_setscheduler_nocheck(t, SCHED_FIFO, &param);
 
 		/*
 		 * We keep the reference to the task struct even if


Patches currently in stable-queue which might be from tpfaff@xxxxxxx are

queue-3.12/genirq-set-the-irq-thread-policy-without-checking-cap_sys_nice.patch
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