block: avoid setting none scheduler if it's already none
There's no reason to freeze queue and remove scheduler if there's no scheduler already. Signed-off-by: Aleksei Zakharov <zakharov.a.g@yandex.ru> Signed-off-by: Jens Axboe <axboe@kernel.dk>hifive-unleashed-5.1
parent
b7143fe67b
commit
fbd72127c9
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@ -667,8 +667,11 @@ static int __elevator_change(struct request_queue *q, const char *name)
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/*
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/*
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* Special case for mq, turn off scheduling
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* Special case for mq, turn off scheduling
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*/
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*/
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if (!strncmp(name, "none", 4))
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if (!strncmp(name, "none", 4)) {
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if (!q->elevator)
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return 0;
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return elevator_switch(q, NULL);
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return elevator_switch(q, NULL);
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}
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strlcpy(elevator_name, name, sizeof(elevator_name));
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strlcpy(elevator_name, name, sizeof(elevator_name));
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e = elevator_get(q, strstrip(elevator_name), true);
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e = elevator_get(q, strstrip(elevator_name), true);
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