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padata: Disable BH when taking works lock on MT path 

[ Upstream commit 58329c4312 ]

As the old padata code can execute in softirq context, disable
softirqs for the new padata_do_mutithreaded code too as otherwise
lockdep will get antsy.

Reported-by: syzbot+0cb5bb0f4bf9e79db3b3@syzkaller.appspotmail.com
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Herbert Xu 2024-04-03 17:36:18 +08:00 committed by Greg Kroah-Hartman
parent db044fa740
commit c0643d07f8
1 changed files with 4 additions and 4 deletions
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8
kernel/padata.c
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@ -106,7 +106,7 @@ static int __init padata_work_alloc_mt(int nworks, void *data,
{
int i;
spin_lock(&padata_works_lock);
spin_lock_bh(&padata_works_lock);
/* Start at 1 because the current task participates in the job. */
for (i = 1; i < nworks; ++i) {
struct padata_work *pw = padata_work_alloc();
@ -116,7 +116,7 @@ static int __init padata_work_alloc_mt(int nworks, void *data,
padata_work_init(pw, padata_mt_helper, data, 0);
list_add(&pw->pw_list, head);
}
spin_unlock(&padata_works_lock);
spin_unlock_bh(&padata_works_lock);
return i;
}
@ -134,12 +134,12 @@ static void __init padata_works_free(struct list_head *works)
if (list_empty(works))
return;
spin_lock(&padata_works_lock);
spin_lock_bh(&padata_works_lock);
list_for_each_entry_safe(cur, next, works, pw_list) {
list_del(&cur->pw_list);
padata_work_free(cur);
}
spin_unlock(&padata_works_lock);
spin_unlock_bh(&padata_works_lock);
}
static void padata_parallel_worker(struct work_struct *parallel_work)