USB: gadget: Allow function access to device ID data during bind()

This is a patch that makes sure that the device ID data (idVendor,
idProduct and bcdDevice) are assigned to the descriptor in the cdev
structure *before* the composite gadget starts binding. This allows the
composite driver, and all the composite functions it uses, access to
that data.

In one of the composite functions we created, we needed to register an
input device and wanted to use the idVendor, idProduct and bcdDevice
codes to properly initialize the id field of the input device. We could
not do that because the idVendor, idProduct and bcdDevice values were
only set in the cdec structure *after* the composite->bind(cdev) call.

Signed-off-by: Robert Lukassen <robert.lukassen@tomtom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index dd6d1905c148514664fd9f205e249d0afa59a82b..391d169f8d0768db4b1aa7e43bc5d855ae0d44c7 100644 (file)
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1017,6 +1017,14 @@ static int composite_bind(struct usb_gadget *gadget)
         */
        usb_ep_autoconfig_reset(cdev->gadget);
 
+       /* standardized runtime overrides for device ID data */
+       if (idVendor)
+               cdev->desc.idVendor = cpu_to_le16(idVendor);
+       if (idProduct)
+               cdev->desc.idProduct = cpu_to_le16(idProduct);
+       if (bcdDevice)
+               cdev->desc.bcdDevice = cpu_to_le16(bcdDevice);
+
        /* composite gadget needs to assign strings for whole device (like
         * serial number), register function drivers, potentially update
         * power state and consumption, etc
@@ -1028,14 +1036,6 @@ static int composite_bind(struct usb_gadget *gadget)
        cdev->desc = *composite->dev;
        cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
 
-       /* standardized runtime overrides for device ID data */
-       if (idVendor)
-               cdev->desc.idVendor = cpu_to_le16(idVendor);
-       if (idProduct)
-               cdev->desc.idProduct = cpu_to_le16(idProduct);
-       if (bcdDevice)
-               cdev->desc.bcdDevice = cpu_to_le16(bcdDevice);
-
        /* strings can't be assigned before bind() allocates the
         * releavnt identifiers
         */