Hello, I am writing a USB driver for some custom hardware, and I need to synchronize between the user-space and the USB subsystem. Can I create a semaphore and "down" it in the reader then "up" it in the completion handler?
I know the completion handler runs in interrupt context so you are not
allowed to acquire any semaphores: but can you release them? Will the
waiting tasks wake up after the handler and its caller returned - IOW
will the waking up task run in interrupt context as well?
This is with Linux 2.4 (if it makes a difference).
Thanks,
florin
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