diff options
author | Ingo Molnar <mingo@kernel.org> | 2014-01-16 08:33:30 (GMT) |
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committer | Ingo Molnar <mingo@kernel.org> | 2014-01-16 08:33:30 (GMT) |
commit | 860fc2f2640ec348b9520ca4649b1bfd23d91bc2 (patch) | |
tree | 73d90d6ef86893c89bb70e78a2b63295d531f371 /drivers/gpu/drm/nouveau/nouveau_acpi.c | |
parent | 197749981e539c1eb5863f417de6dd4e2c02b76c (diff) | |
parent | bee09ed91cacdbffdbcd3b05de8409c77ec9fcd6 (diff) | |
download | linux-860fc2f2640ec348b9520ca4649b1bfd23d91bc2.tar.xz |
Merge branch 'perf/urgent' into perf/core
Pick up the latest fixes, refresh the development tree.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_acpi.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_acpi.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c index 95c7404..ba0183f 100644 --- a/drivers/gpu/drm/nouveau/nouveau_acpi.c +++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c @@ -51,6 +51,7 @@ static struct nouveau_dsm_priv { bool dsm_detected; bool optimus_detected; acpi_handle dhandle; + acpi_handle other_handle; acpi_handle rom_handle; } nouveau_dsm_priv; @@ -260,9 +261,10 @@ static int nouveau_dsm_pci_probe(struct pci_dev *pdev) if (!dhandle) return false; - if (!acpi_has_method(dhandle, "_DSM")) + if (!acpi_has_method(dhandle, "_DSM")) { + nouveau_dsm_priv.other_handle = dhandle; return false; - + } if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER)) retval |= NOUVEAU_DSM_HAS_MUX; @@ -338,6 +340,16 @@ static bool nouveau_dsm_detect(void) printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", acpi_method_name); nouveau_dsm_priv.dsm_detected = true; + /* + * On some systems hotplug events are generated for the device + * being switched off when _DSM is executed. They cause ACPI + * hotplug to trigger and attempt to remove the device from + * the system, which causes it to break down. Prevent that from + * happening by setting the no_hotplug flag for the involved + * ACPI device objects. + */ + acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle); + acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle); ret = true; } |