Re: [PATCH 1/1] Blackfin OTP Char Driver: add writing support of OTP

On 10/13/2008 12:07 PM, Mike Frysinger wrote:
the pos gets updated every time a half-page gets processed. so if you
call write() and tell it to write 128 bytes, but you get an error half
way through, the pos points right at the place where the error
occurred. i dont get what you're asking.

Ah, OK, that's because I don't know exactly what should happen if a write fails.
I though userspace expects the state of the fd to not be touched.

But is this OK to you:
PROCESS 1 PROCESS 2
lock
set allow_writes
write
check allow_writes
be interrupted
whatever
unlock
unset allow_writes
sleep
mutex lock
the processing...

i dont see a problem here. there is no loss of data, hardware
failure, software crashes, etc... in other words, there is no
misbehavior.

I see no purpose of allow_writes then. Why is it there? I don't need to call
memlock if anybody else did and I raced with him. Also when somebody else
unlocks after finishing of writes I can start failing in the middle of my writes
-- this doesn't have anything to do with locking, but with the design, the one
global variable.
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