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md: use current request time as base for ktime comparisons 

Request coalescing logic uses 'prev_flush_start' as base to
compare the current request start time. 'prev_flush_start' is
updated in other context.

This patch changes this by using ktime comparison base to
'req_start' for better readability of code.

Signed-off-by: Pankaj Gupta <pankaj.gupta@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Pankaj Gupta 2020-11-11 06:16:58 +01:00 committed by Song Liu
parent 204d1a6434
commit a23f2aae84
1 changed files with 2 additions and 2 deletions
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4
drivers/md/md.c
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@ -667,10 +667,10 @@ bool md_flush_request(struct mddev *mddev, struct bio *bio)
*/
wait_event_lock_irq(mddev->sb_wait,
!mddev->flush_bio ||
ktime_after(mddev->prev_flush_start, req_start),
ktime_before(req_start, mddev->prev_flush_start),
mddev->lock);
/* new request after previous flush is completed */
if (!ktime_after(mddev->prev_flush_start, req_start)) {
if (ktime_after(req_start, mddev->prev_flush_start)) {
WARN_ON(mddev->flush_bio);
mddev->flush_bio = bio;
bio = NULL;