[PATCH] staging: pi433: add rw semaphore fixing concurrency issues

[Greg Kroah-Hartman]

On Fri, Jun 01, 2018 at 08:50:37AM -0400, Hugo Lefeuvre wrote:
> Add a rw semaphore fixing potential NULL pointer dereferences in the
> pi433 driver.

Unless you can measure the performance difference, do not use a rw
semaphore, just use a normal mutex please.  Odds are it will be faster
in the end and take up less space.

So please test, or if you can't test, just use a mutex.

thanks,

greg k-h