40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
From 7f095a71d6bc49d7c33ed33ebc26daf4867ee4c8 Mon Sep 17 00:00:00 2001
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From: Thomas Pfaff <tpfaff@pcs.com>
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Date: Fri, 11 Oct 2013 12:42:49 +0200
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Subject: [PATCH] genirq: Set the irq thread policy without checking
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CAP_SYS_NICE
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patches-3.12.1-rt4.tar.xz
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In commit ee23871389 ("genirq: Set irq thread to RT priority on
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creation") we moved the assigment of the thread's priority from the
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thread's function into __setup_irq(). That function may run in user
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context for instance if the user opens an UART node and then driver
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calls requests in the ->open() callback. That user may not have
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CAP_SYS_NICE and so the irq thread won't run with the SCHED_OTHER
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policy.
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This patch uses sched_setscheduler_nocheck() so we omit the CAP_SYS_NICE
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check which is otherwise required for the SCHED_OTHER policy.
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Cc: Ivo Sieben <meltedpianoman@gmail.com>
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Cc: stable@vger.kernel.org
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Cc: stable-rt@vger.kernel.org
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Signed-off-by: Thomas Pfaff <tpfaff@pcs.com>
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[bigeasy: rewrite the changelog]
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/irq/manage.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/kernel/irq/manage.c
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+++ b/kernel/irq/manage.c
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@@ -956,7 +956,7 @@ static int
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goto out_mput;
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}
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- sched_setscheduler(t, SCHED_FIFO, ¶m);
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+ sched_setscheduler_nocheck(t, SCHED_FIFO, ¶m);
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/*
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* We keep the reference to the task struct even if
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