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USB: usblp: fix runtime PM after driver unbind

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Since commit c2b71462d2 ("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.

Fixes: c2b71462d2 ("USB: core: Fix bug caused by duplicate interface PM usage counter")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191001084908.2003-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2019-10-01 10:49:06 +02:00 committed by Greg Kroah-Hartman
parent 5c290a5e42
commit 9a31535859
1 changed files with 5 additions and 3 deletions
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8
drivers/usb/class/usblp.c
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@ -461,10 +461,12 @@ static int usblp_release(struct inode *inode, struct file *file)
mutex_lock(&usblp_mutex); mutex_lock(&usblp_mutex);
usblp->used = 0; usblp->used = 0;
if (usblp->present) { if (usblp->present)
usblp_unlink_urbs(usblp); usblp_unlink_urbs(usblp);
usb_autopm_put_interface(usblp->intf);
} else /* finish cleanup from disconnect */ usb_autopm_put_interface(usblp->intf);
if (!usblp->present) /* finish cleanup from disconnect */
usblp_cleanup(usblp); usblp_cleanup(usblp);
mutex_unlock(&usblp_mutex); mutex_unlock(&usblp_mutex);
return 0; return 0;