From: Yu Kuai <yukuai3@huawei.com> mainline inclusion from mainline-v6.9-rc1 commit faeaf210a559eb05bc1a294082d100d01c49a1e9 category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/8374 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- On the one hand, mddev_unlock() will call md_wakeup_thread() unconditionally; on the other hand, md_check_recovery() can't make progress if 'reconfig_mutex' can't be grabbed. Hence, it really doesn't make sense to wake up daemon thread while 'reconfig_mutex' is still grabbed. Remove all the md_wakup_thread() for 'mddev->thread' while 'reconfig_mtuex' is still grabbed. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20231228125553.2697765-3-yukuai1@huaweicloud.com Signed-off-by: Li Nan <linan122@huawei.com> --- drivers/md/md.c | 20 ++------------------ 1 file changed, 2 insertions(+), 18 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 0002758b98df..891bb64d96c3 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -2963,7 +2963,6 @@ static int add_bound_rdev(struct md_rdev *rdev) set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_new_event(); - md_wakeup_thread(mddev->thread); return 0; } @@ -3078,10 +3077,8 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len) if (err == 0) { md_kick_rdev_from_array(rdev); - if (mddev->pers) { + if (mddev->pers) set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); - md_wakeup_thread(mddev->thread); - } md_new_event(); } } @@ -3111,7 +3108,6 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len) clear_bit(BlockedBadBlocks, &rdev->flags); wake_up(&rdev->blocked_wait); set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); - md_wakeup_thread(rdev->mddev->thread); err = 0; } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { @@ -3149,7 +3145,6 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len) !test_bit(Replacement, &rdev->flags)) set_bit(WantReplacement, &rdev->flags); set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); - md_wakeup_thread(rdev->mddev->thread); err = 0; } else if (cmd_match(buf, "-want_replacement")) { /* Clearing 'want_replacement' is always allowed. @@ -3279,7 +3274,6 @@ slot_store(struct md_rdev *rdev, const char *buf, size_t len) if (rdev->raid_disk >= 0) return -EBUSY; set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); - md_wakeup_thread(rdev->mddev->thread); } else if (rdev->mddev->pers) { /* Activating a spare .. or possibly reactivating * if we ever get bitmaps working here. @@ -6225,7 +6219,6 @@ int do_md_run(struct mddev *mddev) /* run start up tasks that require md_thread */ md_start(mddev); - md_wakeup_thread(mddev->thread); md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); @@ -6246,7 +6239,6 @@ int md_start(struct mddev *mddev) if (mddev->pers->start) { set_bit(MD_RECOVERY_WAIT, &mddev->recovery); - md_wakeup_thread(mddev->thread); ret = mddev->pers->start(mddev); clear_bit(MD_RECOVERY_WAIT, &mddev->recovery); md_wakeup_thread(mddev->sync_thread); @@ -6291,7 +6283,6 @@ static int restart_array(struct mddev *mddev) pr_debug("md: %s switched to read-write mode.\n", mdname(mddev)); /* Kick recovery or resync if necessary */ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); md_wakeup_thread(mddev->sync_thread); sysfs_notify_dirent_safe(mddev->sysfs_state); return 0; @@ -6443,7 +6434,6 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { did_freeze = 1; set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - md_wakeup_thread(mddev->thread); } stop_sync_thread(mddev, false, false); @@ -6475,7 +6465,6 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) if ((mddev->pers && !err) || did_freeze) { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); sysfs_notify_dirent_safe(mddev->sysfs_state); } @@ -6497,7 +6486,6 @@ static int do_md_stop(struct mddev *mddev, int mode, if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { did_freeze = 1; set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - md_wakeup_thread(mddev->thread); } stop_sync_thread(mddev, true, false); @@ -6511,7 +6499,6 @@ static int do_md_stop(struct mddev *mddev, int mode, if (did_freeze) { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); } return -EBUSY; } @@ -7052,9 +7039,7 @@ static int hot_remove_disk(struct mddev *mddev, dev_t dev) md_kick_rdev_from_array(rdev); set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); - if (mddev->thread) - md_wakeup_thread(mddev->thread); - else + if (!mddev->thread) md_update_sb(mddev, 1); md_new_event(); @@ -7136,7 +7121,6 @@ static int hot_add_disk(struct mddev *mddev, dev_t dev) * array immediately. */ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - md_wakeup_thread(mddev->thread); md_new_event(); return 0; -- 2.39.2