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Commit 36704c0c authored by Seth Forshee's avatar Seth Forshee Committed by Matthew Garrett
Browse files

vga_switcheroo: Remove assumptions about registration/unregistration ordering 



vga_switcheroo assumes that the handler will be registered before the
last client, otherwise switching will not be enabled. Likewise it's
assumed that the handler will not be unregistered without at least one
client also being unregistered, otherwise switching will remain enabled
despite no longer having a handler. These assumptions cannot be enforced
if the handler is in a separate driver from both clients, as with the
gmux found in Apple laptops. Remove this assumption.

Signed-off-by: default avatarSeth Forshee <seth.forshee@canonical.com>
Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
parent 76b487dd

drivers/gpu/vga/vga_switcheroo.c

+36 −22
Original line number Diff line number Diff line
@@ -70,27 +70,12 @@ static struct vgasr_priv vgasr_priv = { 
	.clients = LIST_HEAD_INIT(vgasr_priv.clients),

};



int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler)

{

	mutex_lock(&vgasr_mutex);

	if (vgasr_priv.handler) {

		mutex_unlock(&vgasr_mutex);

		return -EINVAL;

	}



	vgasr_priv.handler = handler;

	mutex_unlock(&vgasr_mutex);

	return 0;

}

EXPORT_SYMBOL(vga_switcheroo_register_handler);



void vga_switcheroo_unregister_handler(void)

static bool vga_switcheroo_ready(void)

{

	mutex_lock(&vgasr_mutex);

	vgasr_priv.handler = NULL;

	mutex_unlock(&vgasr_mutex);

	/* we're ready if we get two clients + handler */

	return !vgasr_priv.active &&

	       vgasr_priv.registered_clients == 2 && vgasr_priv.handler;

}

EXPORT_SYMBOL(vga_switcheroo_unregister_handler);



static void vga_switcheroo_enable(void)

{
@@ -113,6 +98,37 @@ static void vga_switcheroo_enable(void) 
	vgasr_priv.active = true;

}



int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler)

{

	mutex_lock(&vgasr_mutex);

	if (vgasr_priv.handler) {

		mutex_unlock(&vgasr_mutex);

		return -EINVAL;

	}



	vgasr_priv.handler = handler;

	if (vga_switcheroo_ready()) {

		printk(KERN_INFO "vga_switcheroo: enabled\n");

		vga_switcheroo_enable();

	}

	mutex_unlock(&vgasr_mutex);

	return 0;

}

EXPORT_SYMBOL(vga_switcheroo_register_handler);



void vga_switcheroo_unregister_handler(void)

{

	mutex_lock(&vgasr_mutex);

	vgasr_priv.handler = NULL;

	if (vgasr_priv.active) {

		pr_info("vga_switcheroo: disabled\n");

		vga_switcheroo_debugfs_fini(&vgasr_priv);

		vgasr_priv.active = false;

	}

	mutex_unlock(&vgasr_mutex);

}

EXPORT_SYMBOL(vga_switcheroo_unregister_handler);



static int register_client(struct pci_dev *pdev,

			   const struct vga_switcheroo_client_ops *ops,

			   int id, bool active)
@@ -134,9 +150,7 @@ static int register_client(struct pci_dev *pdev, 
	if (client_is_vga(client))

		vgasr_priv.registered_clients++;



	/* if we get two clients + handler */

	if (!vgasr_priv.active &&

	    vgasr_priv.registered_clients == 2 && vgasr_priv.handler) {

	if (vga_switcheroo_ready()) {

		printk(KERN_INFO "vga_switcheroo: enabled\n");

		vga_switcheroo_enable();

	}