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wimax: document why wimax_msg_*() operations can be used in any state 

Funcion documentation for wimax_msg_alloc() and wimax_msg_send() needs
to clarify that they can be used in the very early stages of a
wimax_dev lifecycle.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
This commit is contained in:
Inaky Perez-Gonzalez 2009-05-05 21:05:16 -07:00
parent 052991d7ac
commit 52a8d96308
1 changed files with 14 additions and 3 deletions
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17
net/wimax/op-msg.c
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@ -108,6 +108,12 @@
* Don't use skb_push()/skb_pull()/skb_reserve() on the skb, as
* wimax_msg_send() depends on skb->data being placed at the
* beginning of the user message.
*
* Unlike other WiMAX stack calls, this call can be used way early,
* even before wimax_dev_add() is called, as long as the
* wimax_dev->net_dev pointer is set to point to a proper
* net_dev. This is so that drivers can use it early in case they need
* to send stuff around or communicate with user space.
*/
struct sk_buff *wimax_msg_alloc(struct wimax_dev *wimax_dev,
const char *pipe_name,
@ -115,7 +121,7 @@ struct sk_buff *wimax_msg_alloc(struct wimax_dev *wimax_dev,
gfp_t gfp_flags)
{
int result;
struct device *dev = wimax_dev->net_dev->dev.parent;
struct device *dev = wimax_dev_to_dev(wimax_dev);
size_t msg_size;
void *genl_msg;
struct sk_buff *skb;
@ -161,7 +167,6 @@ struct sk_buff *wimax_msg_alloc(struct wimax_dev *wimax_dev,
error_new:
nlmsg_free(skb);
return ERR_PTR(result);
}
EXPORT_SYMBOL_GPL(wimax_msg_alloc);
@ -256,10 +261,16 @@ EXPORT_SYMBOL_GPL(wimax_msg_len);
* Don't use skb_push()/skb_pull()/skb_reserve() on the skb, as
* wimax_msg_send() depends on skb->data being placed at the
* beginning of the user message.
*
* Unlike other WiMAX stack calls, this call can be used way early,
* even before wimax_dev_add() is called, as long as the
* wimax_dev->net_dev pointer is set to point to a proper
* net_dev. This is so that drivers can use it early in case they need
* to send stuff around or communicate with user space.
*/
int wimax_msg_send(struct wimax_dev *wimax_dev, struct sk_buff *skb)
{
struct device *dev = wimax_dev->net_dev->dev.parent;
struct device *dev = wimax_dev_to_dev(wimax_dev);
void *msg = skb->data;
size_t size = skb->len;
might_sleep();