| Message ID | c2e46020-aaa6-4e06-bf73-f05823f913f0@I-love.SAKURA.ne.jp (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | dma-buf/sw-sync: don't enable IRQ from sync_print_obj() | expand |
Am 05.05.24 um 16:08 schrieb Tetsuo Handa: > Since commit a6aa8fca4d79 ("dma-buf/sw-sync: Reduce irqsave/irqrestore from > known context") by error replaced spin_unlock_irqrestore() with > spin_unlock_irq() for both sync_debugfs_show() and sync_print_obj() despite > sync_print_obj() is called from sync_debugfs_show(), lockdep complains > inconsistent lock state warning. > > Use plain spin_{lock,unlock}() for sync_print_obj(), for > sync_debugfs_show() is already using spin_{lock,unlock}_irq(). > > Reported-by: syzbot <syzbot+a225ee3df7e7f9372dbe@syzkaller.appspotmail.com> > Closes: https://syzkaller.appspot.com/bug?extid=a225ee3df7e7f9372dbe > Fixes: a6aa8fca4d79 ("dma-buf/sw-sync: Reduce irqsave/irqrestore from known context") > Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Reviewed-by: Christian König <christian.koenig@amd.com> > --- > drivers/dma-buf/sync_debug.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/dma-buf/sync_debug.c b/drivers/dma-buf/sync_debug.c > index 101394f16930..237bce21d1e7 100644 > --- a/drivers/dma-buf/sync_debug.c > +++ b/drivers/dma-buf/sync_debug.c > @@ -110,12 +110,12 @@ static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj) > > seq_printf(s, "%s: %d\n", obj->name, obj->value); > > - spin_lock_irq(&obj->lock); > + spin_lock(&obj->lock); /* Caller already disabled IRQ. */ > list_for_each(pos, &obj->pt_list) { > struct sync_pt *pt = container_of(pos, struct sync_pt, link); > sync_print_fence(s, &pt->base, false); > } > - spin_unlock_irq(&obj->lock); > + spin_unlock(&obj->lock); > } > > static void sync_print_sync_file(struct seq_file *s,
diff --git a/drivers/dma-buf/sync_debug.c b/drivers/dma-buf/sync_debug.c index 101394f16930..237bce21d1e7 100644 --- a/drivers/dma-buf/sync_debug.c +++ b/drivers/dma-buf/sync_debug.c @@ -110,12 +110,12 @@ static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj) seq_printf(s, "%s: %d\n", obj->name, obj->value); - spin_lock_irq(&obj->lock); + spin_lock(&obj->lock); /* Caller already disabled IRQ. */ list_for_each(pos, &obj->pt_list) { struct sync_pt *pt = container_of(pos, struct sync_pt, link); sync_print_fence(s, &pt->base, false); } - spin_unlock_irq(&obj->lock); + spin_unlock(&obj->lock); } static void sync_print_sync_file(struct seq_file *s,
Since commit a6aa8fca4d79 ("dma-buf/sw-sync: Reduce irqsave/irqrestore from known context") by error replaced spin_unlock_irqrestore() with spin_unlock_irq() for both sync_debugfs_show() and sync_print_obj() despite sync_print_obj() is called from sync_debugfs_show(), lockdep complains inconsistent lock state warning. Use plain spin_{lock,unlock}() for sync_print_obj(), for sync_debugfs_show() is already using spin_{lock,unlock}_irq(). Reported-by: syzbot <syzbot+a225ee3df7e7f9372dbe@syzkaller.appspotmail.com> Closes: https://syzkaller.appspot.com/bug?extid=a225ee3df7e7f9372dbe Fixes: a6aa8fca4d79 ("dma-buf/sw-sync: Reduce irqsave/irqrestore from known context") Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> --- drivers/dma-buf/sync_debug.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)