linux-kernel - Re: [PATCH] ACPICA: Export mutex functions

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Message-ID: <2456461.gJP0PmoWKK@aspire.rjw.lan>
Date:   Sat, 15 Apr 2017 00:30:12 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     "Moore, Robert" <robert.moore@...el.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        "Zheng, Lv" <lv.zheng@...el.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "devel@...ica.org" <devel@...ica.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPICA: Export mutex functions

On Wednesday, April 12, 2017 09:56:37 PM Moore, Robert wrote:
> 
> > -----Original Message-----
> > From: Guenter Roeck [mailto:linux@...ck-us.net]
> > Sent: Wednesday, April 12, 2017 2:23 PM
> > To: Moore, Robert <robert.moore@...el.com>
> > Cc: Zheng, Lv <lv.zheng@...el.com>; Wysocki, Rafael J
> > <rafael.j.wysocki@...el.com>; Len Brown <lenb@...nel.org>; linux-
> > acpi@...r.kernel.org; devel@...ica.org; linux-kernel@...r.kernel.org
> > Subject: Re: [PATCH] ACPICA: Export mutex functions
> > 
> > On Wed, Apr 12, 2017 at 03:29:55PM +0000, Moore, Robert wrote:
> > > The ACPICA mutex functions are based on the host OS functions, so they
> > don't really buy you anything. You should just use the native Linux
> > functions.
> > >
> > 
> > You mean they don't really acquire the requested ACPI mutex, and the
> > underlying DSDT which declares and uses the mutex just ignores if the
> > mutex was acquired by acpi_acquire_mutex() ?
> > 
> [Moore, Robert] 
> 
> OK, I understand now. Yes, these mutex interfaces are in fact intended for the purpose you mention:
> 
> * FUNCTION:    AcpiAcquireMutex
>  *
>  * PARAMETERS:  Handle              - Mutex or prefix handle (optional)
>  *              Pathname            - Mutex pathname (optional)
>  *              Timeout             - Max time to wait for the lock (millisec)
>  *
>  * RETURN:      Status
>  *
>  * DESCRIPTION: Acquire an AML mutex. This is a device driver interface to
>  *              AML mutex objects, and allows for transaction locking between
>  *              drivers and AML code. The mutex node is pointed to by
>  *              Handle:Pathname. Either Handle or Pathname can be NULL, but
>  *              not both.
> 
> 
> And yes, both the acquire and release interfaces should be exported.

OK, so I'm assuming this will go in through the upstream ACPICA.

Thanks,
Rafael