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authorPeter Wu <peter@lekensteyn.nl>2016-05-24 18:16:30 +0200
committerPeter Wu <peter@lekensteyn.nl>2016-05-30 16:19:14 +0200
commit3c2468b0022d233f549c171bac58a4084b8cdeb9 (patch)
treec1f39fa6e9f5607691e84ae92a59f674537daa6a
parentb3f2c7fad4f8b16b48f36ec1f96e46395340effa (diff)
downloadlinux-3c2468b0022d233f549c171bac58a4084b8cdeb9.tar.gz
drm/nouveau/acpi: check for function 0x1B before using it
Do not unconditionally invoke function 0x1B without checking for its availability, it leads to an infinite loop on some firmware. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=104791 Fixes: 5addcf0a5f0fad ("nouveau: add runtime PM support (v0.9)") Signed-off-by: Peter Wu <peter@lekensteyn.nl>
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_acpi.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index 915c5449cb24..a1479ecdf21b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -45,6 +45,7 @@
static struct nouveau_dsm_priv {
bool dsm_detected;
bool optimus_detected;
+ bool optimus_flags_detected;
acpi_handle dhandle;
acpi_handle rom_handle;
} nouveau_dsm_priv;
@@ -212,7 +213,8 @@ static const struct vga_switcheroo_handler nouveau_dsm_handler = {
};
static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
- bool *has_mux, bool *has_opt)
+ bool *has_mux, bool *has_opt,
+ bool *has_opt_flags)
{
acpi_handle dhandle;
bool supports_mux;
@@ -236,6 +238,7 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out
*dhandle_out = dhandle;
*has_mux = supports_mux;
*has_opt = !!optimus_funcs;
+ *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
if (optimus_funcs) {
uint32_t result;
@@ -256,6 +259,7 @@ static bool nouveau_dsm_detect(void)
acpi_handle dhandle = NULL;
bool has_mux = false;
bool has_optimus = false;
+ bool has_optimus_flags = false;
int vga_count = 0;
bool guid_valid;
bool ret = false;
@@ -270,13 +274,15 @@ static bool nouveau_dsm_detect(void)
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
- nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus);
+ nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
+ &has_optimus_flags);
}
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
vga_count++;
- nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus);
+ nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
+ &has_optimus_flags);
}
/* find the optimus DSM or the old v1 DSM */
@@ -287,6 +293,7 @@ static bool nouveau_dsm_detect(void)
printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
acpi_method_name);
nouveau_dsm_priv.optimus_detected = true;
+ nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
ret = true;
} else if (vga_count == 2 && has_mux && guid_valid) {
nouveau_dsm_priv.dhandle = dhandle;
@@ -320,8 +327,9 @@ void nouveau_switcheroo_optimus_dsm(void)
if (!nouveau_dsm_priv.optimus_detected)
return;
- nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
- 0x3, &result);
+ if (nouveau_dsm_priv.optimus_flags_detected)
+ nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
+ 0x3, &result);
nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);