From: Alexey Khoroshilov <>
Date: Sat, 17 Feb 2018 01:11:55 +0300

> There is a single error path where tfile->napi_mutex is left unlocked.
> It can lead to a deadlock.
> Found by Linux Driver Verification project (
> Signed-off-by: Alexey Khoroshilov <>

As Eric explained, tun_napi_frags_enabled() (and therefore 'frags')
will never be true for TUN devices, which is the type handled by this
code path.

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