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genirq/proc: Return proper error code when irq_set_affinity() fails

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write_irq_affinity() returns the number of written bytes, which means
success, unconditionally whether the actual irq_set_affinity() call
succeeded or not.

Add proper error handling and pass the error code returned from
irq_set_affinity() back to user space in case of failure.

[ tglx: Fixed coding style and massaged changelog ]

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jiang Biao <jiang.biao2@zte.com.cn>
Cc: zhong.weidong@zte.com.cn
Link: https://lkml.kernel.org/r/1510106103-184761-1-git-send-email-wen.yang99@zte.com.cn
This commit is contained in:
Wen Yaxng 2017-11-08 09:55:03 +08:00 committed by Thomas Gleixner
parent d00a08cf9e
commit 6714796edc
1 changed files with 3 additions and 2 deletions
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5
kernel/irq/proc.c
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@ -154,8 +154,9 @@ static ssize_t write_irq_affinity(int type, struct file *file,
*/
err = irq_select_affinity_usr(irq) ? -EINVAL : count;
} else {
irq_set_affinity(irq, new_value);
err = count;
err = irq_set_affinity(irq, new_value);
if (!err)
err = count;
}
free_cpumask: