Hi,
I am running a usb driver based on usb-skeleton.c, when a device plugged
in, the skel_probe() was called, but stop at following error of
"Couldn't find both bulk-in and bulk-out endpoints" and my ARM system
crashed at "Unable to handle kernel NULL pointer":
if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
err("Couldn't find both bulk-in and bulk-out endpoints");
goto error;
}
The configuration of endpoint for bulk-in and bulk-out at following was
not called. Is the value of iface_desc = &interface->altsetting[0]
assigned from the device or core? I guess I tried to figure out where
the problem was from the device or core.
/* set up the endpoint information */
/* check out the endpoints */
/* use only the first bulk-in and bulk-out endpoints */
iface_desc = &interface->altsetting[0];
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!dev->bulk_in_endpointAddr &&
(endpoint->bEndpointAddress & USB_DIR_IN) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_BULK)) {
/* we found a bulk in endpoint */
buffer_size = endpoint->wMaxPacketSize;
dev->bulk_in_size = buffer_size;
dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
dev->bulk_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
if (!dev->bulk_in_buffer) {
err("Couldn't allocate bulk_in_buffer");
goto error;
}
}
Thank you.
Jim
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