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blk-mq: check q->poll_stat in queue_poll_stat_show

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Without checking q->poll_stat in queue_poll_stat_show(), kernel panic
may be caused if q->poll_stat isn't allocated.

Fixes: 48b5c1fbcd ("block: only allocate poll_stats if there's a user of them")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20211202090716.3292244-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2021-12-02 17:07:16 +08:00 committed by Jens Axboe
parent 8a7518931b
commit 18d78171c0
1 changed files with 3 additions and 0 deletions
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3
block/blk-mq-debugfs.c
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@ -30,6 +30,9 @@ static int queue_poll_stat_show(void *data, struct seq_file *m)
struct request_queue *q = data;
int bucket;
if (!q->poll_stat)
return 0;
for (bucket = 0; bucket < (BLK_MQ_POLL_STATS_BKTS / 2); bucket++) {
seq_printf(m, "read (%d Bytes): ", 1 << (9 + bucket));
print_stat(m, &q->poll_stat[2 * bucket]);