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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: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Seth Forshee 2012-08-17 11:17:03 -05:00 committed by Matthew Garrett
parent 76b487dd51
commit 36704c0c4c
1 changed files with 36 additions and 22 deletions
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58
drivers/gpu/vga/vga_switcheroo.c
View File

@ -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)
static bool vga_switcheroo_ready(void)
{
mutex_lock(&vgasr_mutex);
if (vgasr_priv.handler) {
mutex_unlock(&vgasr_mutex);
return -EINVAL;
}
vgasr_priv.handler = handler;
mutex_unlock(&vgasr_mutex);
return 0;
/* 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_register_handler);
void vga_switcheroo_unregister_handler(void)
{
mutex_lock(&vgasr_mutex);
vgasr_priv.handler = NULL;
mutex_unlock(&vgasr_mutex);
}
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();
}