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Feature #3306
open132: Usb device reference counting with usb_get_dev/usb_put_dev and interface_to_usbdev
Start date:
07/30/2012
Due date:
% Done:
0%
Estimated time:
Published in build:
Description
Proper reference counting should be performed for struct usb_device
with the use of functions usb_get_dev
/usb_put_dev
.
/** * usb_get_dev - increments the reference count of the usb device structure * @dev: the device being referenced * * Each live reference to a device should be refcounted. * * Drivers for USB interfaces should normally record such references in * their probe() methods, when they bind to an interface, and release * them by calling usb_put_dev(), in their disconnect() methods.
Usually the reference count is increased in
probe()
handler and decreased in disconnect()
/exit()
handler. It look like interface_to_usbdev()
macro is often used in probe()
handler to get the reference to usb_device
by the reference to usb_interface
.
So the rule may be initially formalized in the following way: after acquiring a reference to struct usb_device
with usb_interface
macro one should increase the corresponding reference counter with usb_get_dev
and then decrease it with usb_put_dev
at finalization.
Links
Sample bugfixes 927c3fa
Updated by Mikhail Mandrykin about 12 years ago
- Assignee set to Mikhail Mandrykin
Updated by Vitaly Mordan about 10 years ago
Unnecessary header
#include <linux/usb.h>
may cause Aspectator to failed at 'instrumentation' stage.
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