develoment workflow: how to avoid duplicate work ?

[Hugo Lefeuvre]

> > So, if pi433_release() and pi433_ioctl() can be concurrently executed
> > then this issue might happen.
> 
> But isn't release() called when nothing is referencing the file anymore,
> so there should be no other file operation running concurrently?

The vfs documentation states: release() is "called when the last
reference to an open file is closed".

Let's say we have a program with threads T1 and T2.

- T1 calls ioctl on a file descriptor FD.
- (on another processor) T2 closes FD.

Since the last reference to FD was closed by T2, release is called.
But while release is being called, the ioctl call from T1 may still
be running, right ?

-- 
             Hugo Lefeuvre (hle)    |    www.owl.eu.com
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