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 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
