linux-kernel - Re: [Update][PATCH 4/5][RFT] ACPI / hotplug / PCI: Simplify acpi_install_hotplug_notify

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Date:	Fri, 31 Jan 2014 16:42:21 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Aaron Lu <aaron.lu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: [Update][PATCH 4/5][RFT] ACPI / hotplug / PCI: Simplify acpi_install_hotplug_notify_handler()

On Friday, January 31, 2014 05:28:36 PM Mika Westerberg wrote:
> On Wed, Jan 29, 2014 at 01:00:57AM +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > 
> > Use the observation that the ACPI scan handler of the device object
> > in acpi_hotplug_notify_cb() can be obtained from that device object's
> > handler pointer and do not pass it as data to
> > acpi_install_hotplug_notify_handler() in acpi_scan_init_hotplug().
> > 
> > That allows the second argument of acpi_install_hotplug_notify_handler()
> > to be dropped, so do it and update its callers accordingly.
> > 
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > ---
> >  drivers/acpi/scan.c                |   31 ++++++++++++++++++-------------
> >  drivers/pci/hotplug/acpiphp_glue.c |    2 +-
> >  include/acpi/acpi_bus.h            |    2 +-
> >  3 files changed, 20 insertions(+), 15 deletions(-)
> > 
> > Index: linux-pm/drivers/acpi/scan.c
> > ===================================================================
> > --- linux-pm.orig/drivers/acpi/scan.c
> > +++ linux-pm/drivers/acpi/scan.c
> > @@ -487,7 +487,6 @@ static void acpi_device_hotplug(void *da
> >  
> >  static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
> >  {
> > -	struct acpi_scan_handler *handler = data;
> >  	u32 ost_code = ACPI_OST_SC_SUCCESS;
> >  	struct acpi_device *adev;
> >  	acpi_status status;
> > @@ -503,13 +502,6 @@ static void acpi_hotplug_notify_cb(acpi_
> >  
> >  	case ACPI_NOTIFY_EJECT_REQUEST:
> >  		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
> > -		if (handler && !handler->hotplug.enabled) {
> > -			acpi_handle_err(handle, "Eject disabled\n");
> > -			ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
> > -			goto out;
> > -		}
> > -		acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
> > -					  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
> >  		break;
> >  
> >  	case ACPI_NOTIFY_DEVICE_WAKE:
> > @@ -535,11 +527,24 @@ static void acpi_hotplug_notify_cb(acpi_
> >  		goto out;
> >  	}
> >  
> > +	mutex_lock(&acpi_scan_lock);
> 
> This is weird. I'm testing against your test-next branch which has this
> patch included. If I remove locking here, TBT hotplug works fine. Otherwise
> I can see the first hotplug/unplug works but after that I cannot get any
> events anymore.

Weird indeed.  I don't seem to be able to reproduce that on my Aspire S5.

What system are you testing on?

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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