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| author | Alan Stern <stern@rowland.harvard.edu> | 2013-07-30 21:18:15 +0200 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2013-09-17 17:38:51 +0200 |
| commit | 5f5610f69be3a925b1f79af27150bb7377bc9ad6 (patch) | |
| tree | 8c1f09ec3d2928798a096fb8df9bb5cd3cd1683c | |
| parent | usb: gadget: mv_u3d_core: fix violation of locking discipline in mv_u3d_ep_di... (diff) | |
| download | linux-5f5610f69be3a925b1f79af27150bb7377bc9ad6.tar.xz linux-5f5610f69be3a925b1f79af27150bb7377bc9ad6.zip | |
usb: gadget: fix a bug and a WARN_ON in dummy-hcd
This patch fixes a NULL pointer dereference and a WARN_ON in
dummy-hcd. These things were the result of moving to the UDC core
framework, and possibly of changes to that framework.
Now unloading a gadget driver causes the UDC to be stopped after the
gadget driver is unbound, not before. Therefore the "driver" argument
to dummy_udc_stop() can be NULL, so we must not try to print the
driver's name without checking first.
Also, the UDC framework automatically unregisters the gadget when the
UDC is deleted. Therefore a sysfs attribute file attached to the
gadget must be removed before the UDC is deleted, not after.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: <stable@vger.kernel.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
| -rw-r--r-- | drivers/usb/gadget/dummy_hcd.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c index 06ecd08fd57a..b8a2376971a4 100644 --- a/drivers/usb/gadget/dummy_hcd.c +++ b/drivers/usb/gadget/dummy_hcd.c @@ -923,8 +923,9 @@ static int dummy_udc_stop(struct usb_gadget *g, struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); struct dummy *dum = dum_hcd->dum; - dev_dbg(udc_dev(dum), "unregister gadget driver '%s'\n", - driver->driver.name); + if (driver) + dev_dbg(udc_dev(dum), "unregister gadget driver '%s'\n", + driver->driver.name); dum->driver = NULL; @@ -1000,8 +1001,8 @@ static int dummy_udc_remove(struct platform_device *pdev) { struct dummy *dum = platform_get_drvdata(pdev); - usb_del_gadget_udc(&dum->gadget); device_remove_file(&dum->gadget.dev, &dev_attr_function); + usb_del_gadget_udc(&dum->gadget); return 0; } |