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[PATCH] Drop tasklist lock in do_sched_setscheduler 

There is no need to hold tasklist_lock across the setscheduler call, when
we pin the task structure with get_task_struct().  Interrupts are disabled
in setscheduler anyway and the permission checks do not need interrupts
disabled.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Thomas Gleixner 2006-06-27 02:55:00 -07:00 committed by Linus Torvalds
parent a1583d3e83
commit e74c69f46d
1 changed files with 3 additions and 1 deletions
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4
kernel/sched.c
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@ -4091,8 +4091,10 @@ do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param)
read_unlock_irq(&tasklist_lock);
return -ESRCH;
}
retval = sched_setscheduler(p, policy, &lparam);
get_task_struct(p);
read_unlock_irq(&tasklist_lock);
retval = sched_setscheduler(p, policy, &lparam);
put_task_struct(p);
return retval;
}