Re: [PATCH] ACPICA: Export mutex functions

[Rafael J. Wysocki]

On Wednesday, April 12, 2017 09:56:37 PM Moore, Robert wrote:
> 
> > -----Original Message-----
> > From: Guenter Roeck [mailto:linux@xxxxxxxxxxxx]
> > Sent: Wednesday, April 12, 2017 2:23 PM
> > To: Moore, Robert <robert.moore@xxxxxxxxx>
> > Cc: Zheng, Lv <lv.zheng@xxxxxxxxx>; Wysocki, Rafael J
> > <rafael.j.wysocki@xxxxxxxxx>; Len Brown <lenb@xxxxxxxxxx>; linux-
> > acpi@xxxxxxxxxxxxxxx; devel@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> > 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