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USB: serial: fix potential runtime pm imbalance at device remove

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commit c14829fad8 upstream.

Only call usb_autopm_put_interface() if the corresponding
usb_autopm_get_interface() was successful.

This prevents a potential runtime PM counter imbalance should
usb_autopm_get_interface() fail. Note that the USB PM usage counter is
reset when the interface is unbound, but that the runtime PM counter may
be left unbalanced.

Also add comment on why we don't need to worry about racing
resume/suspend on autopm_get failures.

Fixes: d5fd650cfc ("usb: serial: prevent suspend/resume from racing
against probe/remove")

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold
2014-05-26 19:23:33 +02:00
committed by Greg Kroah-Hartman
parent ba0359524c
commit 79d3d9bcac
1 changed files with 11 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/usb/serial/bus.c
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@@ -97,13 +97,19 @@ static int usb_serial_device_remove(struct device *dev)
struct usb_serial_port *port;
int retval = 0;
int minor;
int autopm_err;
port = to_usb_serial_port(dev);
if (!port)
return -ENODEV;
/* make sure suspend/resume doesn't race against port_remove */
usb_autopm_get_interface(port->serial->interface);
/*
* Make sure suspend/resume doesn't race against port_remove.
*
* Note that no further runtime PM callbacks will be made if
* autopm_get fails.
*/
autopm_err = usb_autopm_get_interface(port->serial->interface);
minor = port->minor;
tty_unregister_device(usb_serial_tty_driver, minor);
@@ -117,7 +123,9 @@ static int usb_serial_device_remove(struct device *dev)
dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
driver->description, minor);
usb_autopm_put_interface(port->serial->interface);
if (!autopm_err)
usb_autopm_put_interface(port->serial->interface);
return retval;
}