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authorKrzysztof Opasiak <k.opasiak@samsung.com>2016-05-05 11:46:05 +0300
committerFelipe Balbi <felipe.balbi@linux.intel.com>2016-05-31 10:02:53 +0300
commitf1bddbb3de60872acc2446eee97dbeb0a6d57acb (patch)
treefb0786404eafa9f6e3dd7d8c840ea1e17700dd40 /include/linux/usb
parent1a695a905c18548062509178b98bc91e67510864 (diff)
downloadlinux-f1bddbb3de60872acc2446eee97dbeb0a6d57acb.tar.xz
usb: gadget: Fix binding to UDC via configfs interface
By default user could store only valid UDC name in configfs UDC attr by doing: echo $UDC_NAME > UDC Commit (855ed04 "usb: gadget: udc-core: independent registration of gadgets and gadget drivers") broke this behavior and allowed to store any arbitrary string in UDC file and udc core was waiting for such controller to appear. echo "any arbitrary string here" > UDC This commit fix this by adding a flag which prevents configfs gadget from being added to list of pending drivers if UDC with given name has not been found. Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'include/linux/usb')
-rw-r--r--include/linux/usb/gadget.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 457651bf45b0..fefe8b06a63d 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -1034,6 +1034,8 @@ static inline int usb_gadget_activate(struct usb_gadget *gadget)
* @udc_name: A name of UDC this driver should be bound to. If udc_name is NULL,
* this driver will be bound to any available UDC.
* @pending: UDC core private data used for deferred probe of this driver.
+ * @match_existing_only: If udc is not found, return an error and don't add this
+ * gadget driver to list of pending driver
*
* Devices are disabled till a gadget driver successfully bind()s, which
* means the driver will handle setup() requests needed to enumerate (and
@@ -1097,6 +1099,7 @@ struct usb_gadget_driver {
char *udc_name;
struct list_head pending;
+ unsigned match_existing_only:1;
};