From 30045f2174aab7fb4db7a9cf902d0aa6c75856a7 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Tue, 1 Oct 2019 10:49:08 +0200
Subject: [PATCH] media: stkwebcam: fix runtime PM after driver unbind
Git-commit: 30045f2174aab7fb4db7a9cf902d0aa6c75856a7
Patch-mainline: v5.4-rc3
References: bsc#1051510
Since commit c2b71462d294 ("USB: core: Fix bug caused by duplicate
interface PM usage counter") USB drivers must always balance their
runtime PM gets and puts, including when the driver has already been
unbound from the interface.
Leaving the interface with a positive PM usage counter would prevent a
later bound driver from suspending the device.
Note that runtime PM has never actually been enabled for this driver
since the support_autosuspend flag in its usb_driver struct is not set.
Fixes: c2b71462d294 ("USB: core: Fix bug caused by duplicate interface PM usage counter")
Cc: stable <stable@vger.kernel.org>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191001084908.2003-5-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/media/usb/stkwebcam/stk-webcam.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c
index cfca3c70599b..21f90a887485 100644
--- a/drivers/media/usb/stkwebcam/stk-webcam.c
+++ b/drivers/media/usb/stkwebcam/stk-webcam.c
@@ -643,8 +643,7 @@ static int v4l_stk_release(struct file *fp)
dev->owner = NULL;
}
- if (is_present(dev))
- usb_autopm_put_interface(dev->interface);
+ usb_autopm_put_interface(dev->interface);
mutex_unlock(&dev->lock);
return v4l2_fh_release(fp);
}
--
2.16.4