Hi all
I was reading the sample code for usb-skeleton.c and i need to clear
somethings.
1. in skel_probe()
247 struct usb_skel *dev = NULL;
...
254 /* allocate memory for our device state and initialize it */
255 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
256 if (dev == NULL) {
257 err("Out of memory");
258 goto error;
259 }
...
struct usb_skel *dev = NULL on line no. 247 but when we allocate
memory for it we didnt use it like
dev = kmalloc(sizeof(struct usb_skel), GFP_KERNEL)
instead we are using kmalloc(sizeof(*dev), GFP_KERNEL). Had it been
allocated initially and then using *dev somewhere is understandable.
but using *dev before allocating dev seems weird.
Shouldnt it be dev = kmalloc(sizeof(struct usb_skel), GFP_KERNEL)
instead of dev = kmalloc( sizeof(*dev), GFP_KERNEL)?
Or am i missing something here?
2. What does le16_to_cpu(...) does?
Is it necessary to use it here?
278 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
What is the significance of it. Tried going through source but couldnt
make out much.
Any pointers or links will be appreciated.
TIA
Pradeep
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