USB: skel_read really sucks royally
The read code path of the skeleton driver really sucks
- skel_read works only for devices which always send data
- the timeout comes out of thin air
- it blocks signals for the duration of the timeout
- it disallows nonblocking IO by design
This patch fixes it by using a real urb, a completion and interruptible waits.
Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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