4.19-stable review patch. If anyone has any objections, please let me know.
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From: Armin Wolf W_Armin@gmx.de
[ Upstream commit ed85891a276edaf7a867de0e9acd0837bc3008f2 ]
When a WMI device besides the first one somehow fails to register, retval is returned while still containing a negative error code. This causes the ACPI device fail to probe, leaving behind zombie WMI devices leading to various errors later.
Handle the single error path separately and return 0 unconditionally after trying to register all WMI devices to solve the issue. Also continue to register WMI devices even if some fail to allocate memory.
Fixes: 6ee50aaa9a20 ("platform/x86: wmi: Instantiate all devices before adding them") Signed-off-by: Armin Wolf W_Armin@gmx.de Link: https://lore.kernel.org/r/20231020211005.38216-4-W_Armin@gmx.de Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/x86/wmi.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index 387358af685c5..b9d01a652ede2 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -1131,8 +1131,8 @@ static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device) struct wmi_block *wblock, *next; union acpi_object *obj; acpi_status status; - int retval = 0; u32 i, total; + int retval;
status = acpi_evaluate_object(device->handle, "_WDG", NULL, &out); if (ACPI_FAILURE(status)) @@ -1143,8 +1143,8 @@ static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device) return -ENXIO;
if (obj->type != ACPI_TYPE_BUFFER) { - retval = -ENXIO; - goto out_free_pointer; + kfree(obj); + return -ENXIO; }
gblock = (const struct guid_block *)obj->buffer.pointer; @@ -1165,8 +1165,8 @@ static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device)
wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL); if (!wblock) { - retval = -ENOMEM; - break; + dev_err(wmi_bus_dev, "Failed to allocate %pUL\n", &gblock[i].guid); + continue; }
wblock->acpi_device = device; @@ -1205,9 +1205,9 @@ static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device) } }
-out_free_pointer: - kfree(out.pointer); - return retval; + kfree(obj); + + return 0; }
/*