On Thursday 30 January 2014 11:46 PM, Alan Stern wrote:
On Thu, 30 Jan 2014, Kumar Gaurav wrote:
Hi All,
I have some questions regarding below two methods in
drivers/usr/core/urb.c source code.
Methods:
void usb_kill_urb(struct urb *urb)
void usb_poison_urb(struct urb *urb)
In both functions we have used `wait_event` method but haven't checked
for the condition `atomic_read(&urb->use_count) == 0` before going to sleep.
Should we add the check before putting the calling process to sleep or
avoiding check is intended (please explain if yes).
We don't need to check, because wait_event checks the condition before
it goes to sleep.
Alan Stern
Okay Now I got it.
Thanks
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