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From: chetannanda@gmail.com (Chetan Nanda)
To: kernelnewbies@lists.kernelnewbies.org
Subject: owner not checked in mutex_unlock
Date: Thu, 10 Mar 2016 14:59:31 +0530	[thread overview]
Message-ID: <CAPrYoTGO8DaT=sbEbix1He-aBztCfmO6SuiBCnzYvTsr71D8-Q@mail.gmail.com> (raw)

Hi,

As per book (Linux kernel development)

"Whoever locked a mutex must unlock it.That is, you cannot lock a mutex in one
context and then unlock it in another
"
but 'mutex_unlock' code is not checking the owner field at all.

Also, I tried with locking the mutex from normal process context and
unlocking from separate context (work context) and it is allowed
without any error from kernel.

Is it the mutex user responsibility to keep track of it? Ideally
mutex_unlock should check if owner is same as current?

Thanks,
Chetan Nanda

             reply	other threads:[~2016-03-10  9:29 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-10  9:29 Chetan Nanda [this message]
2016-03-15 13:48 ` owner not checked in mutex_unlock Cihangir Akturk
2016-03-15 13:59   ` Chetan Nanda
2016-03-15 14:42     ` Cihangir Akturk

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