[PATCH 5.10 178/545] media: tw686x: Register the irq at the end of probe

Greg Kroah-Hartman
2022-08-19T16:07:40Z

From: Zheyu Ma <zheyuma97@gmail.com>

[ Upstream commit fb730334e0f759d00f72168fbc555e5a95e35210 ]

We got the following warning when booting the kernel:

[ 3.243674] INFO: trying to register non-static key.
[ 3.243922] The code is fine but needs lockdep annotation, or maybe
[ 3.244230] you didn't initialize this object before use?
[ 3.245642] Call Trace:
[ 3.247836] lock_acquire+0xff/0x2d0
[ 3.248727] tw686x_audio_irq+0x1a5/0xcc0 [tw686x]
[ 3.249211] tw686x_irq+0x1f9/0x480 [tw686x]

The lock 'vc->qlock' will be initialized in tw686x_video_init(), but the
driver registers the irq before calling the tw686x_video_init(), and we
got the warning.

Fix this by registering the irq at the end of probe

Fixes: 704a84ccdbf1 ("[media] media: Support Intersil/Techwell TW686x-based video capture cards")
Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/pci/tw686x/tw686x-core.c | 18 ++++++++----------
1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/media/pci/tw686x/tw686x-core.c b/drivers/media/pci/tw686x/tw686x-core.c
index 74ae4f0dcee7..8a25a0dac4ae 100644
--- a/drivers/media/pci/tw686x/tw686x-core.c
+++ b/drivers/media/pci/tw686x/tw686x-core.c
@@ -315,13 +315,6 @@ static int tw686x_probe(struct pci_dev *pci_dev,

spin_lock_init(&dev->lock);

- err = request_irq(pci_dev->irq, tw686x_irq, IRQF_SHARED,
- dev->name, dev);
- if (err < 0) {
- dev_err(&pci_dev->dev, "unable to request interrupt\n");
- goto iounmap;
- }
-
timer_setup(&dev->dma_delay_timer, tw686x_dma_delay, 0);

/*
@@ -333,18 +326,23 @@ static int tw686x_probe(struct pci_dev *pci_dev,
err = tw686x_video_init(dev);
if (err) {
dev_err(&pci_dev->dev, "can't register video\n");
- goto free_irq;
+ goto iounmap;
}

err = tw686x_audio_init(dev);
if (err)
dev_warn(&pci_dev->dev, "can't register audio\n");

+ err = request_irq(pci_dev->irq, tw686x_irq, IRQF_SHARED,
+ dev->name, dev);
+ if (err < 0) {
+ dev_err(&pci_dev->dev, "unable to request interrupt\n");
+ goto iounmap;
+ }
+
pci_set_drvdata(pci_dev, dev);
return 0;

-free_irq:
- free_irq(pci_dev->irq, dev);
iounmap:
pci_iounmap(pci_dev, dev->mmio);
free_region:
--
2.35.1