--- fs/ioprio.c

+++ fs/ioprio.c

@@ -29,7 +29,7 @@

int set_task_ioprio(struct task_struct *task, int ioprio)

{

- int err;

+ int err, i;

struct io_context *ioc;

const struct cred *cred = current_cred(), *tcred;

@@ -59,12 +59,17 @@ int set_task_ioprio(struct task_struct *

err = -ENOMEM;

break;

}

+ /* let other ioc users see the new values */

+ smp_wmb();

task->io_context = ioc;

} while (1);

if (!err) {

ioc->ioprio = ioprio;

- ioc->ioprio_changed = 1;

+ /* make sure schedulers see the new ioprio value */

+ wmb();

+ for (i = 0; i < IOC_IOPRIO_CHANGED_BITS; i++)

+ set_bit(i, ioc->ioprio_changed);

}

task_unlock(task);