forked from Minki/linux
f770fbec41
As Anton and Evgeny have noted, the net2280 UDC driver has a problem with leaking memory along some of its failure pathways. It also has another problem, not previously noted, in that some of the failure pathways will call usb_del_gadget_udc() without first calling usb_add_gadget_udc_release(). And it leaks memory by calling kfree() when it should call put_device(). Previous attempts to fix the problems have failed because of lack of support in the UDC core for separately initializing and adding gadgets, or for separately deleting and freeing gadgets. The previous patch in this series adds the necessary support, making it possible to fix the outstanding problems properly. This patch adds an "added" flag to the net2280 structure to indicate whether or not the gadget has been registered (and thus whether or not to call usb_del_gadget()), and it fixes the deallocation issues by calling usb_put_gadget() at the appropriate point. A similar memory leak issue, apparently never before recognized, stems from the fact that the driver never initializes the drvdata field in the gadget's embedded struct device! Evidently this wasn't noticed because the pointer is only ever used as an argument to kfree(), which doesn't mind getting called with a NULL pointer. In fact, the drvdata for gadget device will be written by usb_composite_dev structure if any gadget class is loaded, so it needs to use usb_gadget structure to get net2280 private data. CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reported-by: Anton Vasilyev <vasilyev@ispras.ru> Reported-by: Evgeny Novikov <novikov@ispras.ru> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org> |
||
|---|---|---|
| .. | ||
| function | ||
| legacy | ||
| udc | ||
| composite.c | ||
| config.c | ||
| configfs.c | ||
| configfs.h | ||
| epautoconf.c | ||
| functions.c | ||
| Kconfig | ||
| Makefile | ||
| u_f.c | ||
| u_f.h | ||
| u_os_desc.h | ||
| usbstring.c | ||