3.8.13.13-rt25-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Thomas Pfaff <tpfaff@xxxxxxx>
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.
Cc: Ivo Sieben <meltedpianoman@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: stable-rt@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Pfaff <tpfaff@xxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
[bigeasy: rewrite the changelog]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
kernel/irq/manage.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index a3cf48e..a569b71 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1044,7 +1044,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
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
--
1.8.4.rc3
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