Zitat von Oliver Neukum <oneukum@xxxxxxxx>:
Am Montag, den 21.05.2018, 21:00 +0000 schrieb guido@kiener-
muenchen.de:
I looked for a race here, but I do not find a race between open and release,
since a refcount of "file_data->data->kref" is always hold by
usbtmc_probe/disconnect.
However I see a race between usbtmc_open and usbtmc_disconnect. Are these
callback functions called mutual exclusive?
No, they are not.
In the meantime I found these conflictive hints:
https://github.com/torvalds/linux/commit/52a749992ca6a0fd304609af40ed3bfd6cef4660
and
https://elixir.bootlin.com/linux/v4.17-rc6/source/include/linux/usb.h#L1164
What do you think?
My current feeling is that open/disconnect is mutual exclusive.
We also could verify what really happens.
Thanks,
Guido
I'm not sure, but if not, then I think we have the same problem in
usb-skeleton.c
In usb-skeleton.c a race exists. You are right.
Regards
Oliver
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