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dm kcopyd: avoid spin_lock_irqsave from process context

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The functions "pop", "push_head", "do_work" can only be called from
process context. Therefore, replace spin_lock_irq{save,restore} with
spin_{lock,unlock}_irq.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2021-05-26 10:18:06 -04:00 • committed by Mike Snitzer
parent db2351eb22
commit 6bcd658f2a
1 changed files with 6 additions and 9 deletions
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15
drivers/md/dm-kcopyd.c
View file

@ -437,9 +437,8 @@ static struct kcopyd_job *pop(struct list_head *jobs,
struct dm_kcopyd_client *kc)
{
struct kcopyd_job *job = NULL;
unsigned long flags;
spin_lock_irqsave(&kc->job_lock, flags);
spin_lock_irq(&kc->job_lock);
if (!list_empty(jobs)) {
if (jobs == &kc->io_jobs)
@ -449,7 +448,7 @@ static struct kcopyd_job *pop(struct list_head *jobs,
list_del(&job->list);
}
}
spin_unlock_irqrestore(&kc->job_lock, flags);
spin_unlock_irq(&kc->job_lock);
return job;
}
@ -467,12 +466,11 @@ static void push(struct list_head *jobs, struct kcopyd_job *job)
static void push_head(struct list_head *jobs, struct kcopyd_job *job)
{
unsigned long flags;
struct dm_kcopyd_client *kc = job->kc;
spin_lock_irqsave(&kc->job_lock, flags);
spin_lock_irq(&kc->job_lock);
list_add(&job->list, jobs);
spin_unlock_irqrestore(&kc->job_lock, flags);
spin_unlock_irq(&kc->job_lock);
}
/*
@ -648,7 +646,6 @@ static void do_work(struct work_struct *work)
struct dm_kcopyd_client *kc = container_of(work,
struct dm_kcopyd_client, kcopyd_work);
struct blk_plug plug;
unsigned long flags;
/*
* The order that these are called is *very* important.
@ -657,9 +654,9 @@ static void do_work(struct work_struct *work)
* list. io jobs call wake when they complete and it all
* starts again.
*/
spin_lock_irqsave(&kc->job_lock, flags);
spin_lock_irq(&kc->job_lock);
list_splice_tail_init(&kc->callback_jobs, &kc->complete_jobs);
spin_unlock_irqrestore(&kc->job_lock, flags);
spin_unlock_irq(&kc->job_lock);
blk_start_plug(&plug);
process_jobs(&kc->complete_jobs, kc, run_complete_job);