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genirq: Set the irq thread policy without checking CAP_SYS_NICE

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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@pcs.com>
Cc: Ivo Sieben <meltedpianoman@gmail.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1381489240-29626-1-git-send-email-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Pfaff 2013-10-11 13:00:40 +02:00 • committed by Thomas Gleixner
parent fd2f3b7ee1
commit bbfe65c219
1 changed files with 1 additions and 1 deletions
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2
kernel/irq/manage.c
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@ -956,7 +956,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
goto out_mput; 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 * We keep the reference to the task struct even if