From mboxrd@z Thu Jan  1 00:00:00 1970
From: lroluk@gmail.com (Luca Ellero)
Date: Thu, 14 Nov 2013 11:32:14 +0100
Subject: Best practice to lock a read/write to a HW register
Message-ID: <5284A6AE.90901@gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi all,
can someone please show me which is the best practice to lock a
read/write to a hardware register.
In other words if, in a driver, I want to modify a bit in a HW register,
I have to read the register, set/reset the relevant bit and write back
the reg.
But what can I do to be sure that no other code modifies the register
between my read and write?
Is spin_lock() suitable for this purpose?
Thanks
Best regards
Luca