From cf342e52e3117391868fb4bd900ce772a27a5a1a Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Tue, 29 Aug 2006 09:17:41 +0200 Subject: [PATCH] [PATCH] Don't need to disable interrupts for tasklist_lock Signed-off-by: Oleg Nesterov Signed-off-by: Jens Axboe --- fs/ioprio.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/ioprio.c b/fs/ioprio.c index 0fd1089d7bf6..03dc4f269b76 100644 --- a/fs/ioprio.c +++ b/fs/ioprio.c @@ -81,7 +81,12 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio) } ret = -ESRCH; - read_lock_irq(&tasklist_lock); + /* + * We want IOPRIO_WHO_PGRP/IOPRIO_WHO_USER to be "atomic", + * so we can't use rcu_read_lock(). See re-copy of ->ioprio + * in copy_process(). + */ + read_lock(&tasklist_lock); switch (which) { case IOPRIO_WHO_PROCESS: if (!who) @@ -124,7 +129,7 @@ free_uid: ret = -EINVAL; } - read_unlock_irq(&tasklist_lock); + read_unlock(&tasklist_lock); return ret; } @@ -170,7 +175,7 @@ asmlinkage long sys_ioprio_get(int which, int who) int ret = -ESRCH; int tmpio; - read_lock_irq(&tasklist_lock); + read_lock(&tasklist_lock); switch (which) { case IOPRIO_WHO_PROCESS: if (!who) @@ -221,7 +226,7 @@ asmlinkage long sys_ioprio_get(int which, int who) ret = -EINVAL; } - read_unlock_irq(&tasklist_lock); + read_unlock(&tasklist_lock); return ret; }