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platform/x86: dell-wmi: Fix driver interface version query

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When I converted dell-wmi to the new bus infrastructure, I left the
call to dell_wmi_check_descriptor_buffer() in dell_wmi_init().  This
could cause two problems:

 - An error message when loading the driver on a system without
   dell-wmi.  We'd try to read the event descriptor even if the WMI
   GUID wasn't there.

 - A possible race if dell-wmi was loaded manually before wmi was
   fully initialized.

Fix it by moving the call to the probe function where it belongs.

Fixes: bff589be59 ("platform/x86: dell-wmi: Convert to the WMI bus infrastructure")
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
This commit is contained in:
Andy Lutomirski 2017-08-01 08:37:26 -07:00 committed by Darren Hart (VMware)
parent 95a5af1838
commit baa5480b05
1 changed files with 7 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/platform/x86/dell-wmi.c
View file

@ -626,7 +626,7 @@ static void dell_wmi_input_destroy(struct wmi_device *wdev)
* WMI Interface Version 8 4 <version>
* WMI buffer length 12 4 4096
*/
static int __init dell_wmi_check_descriptor_buffer(void)
static int dell_wmi_check_descriptor_buffer(void)
{
struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
@ -717,9 +717,15 @@ static int dell_wmi_events_set_enabled(bool enable)
static int dell_wmi_probe(struct wmi_device *wdev)
{
int err;
struct dell_wmi_priv *priv = devm_kzalloc(
&wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL);
err = dell_wmi_check_descriptor_buffer();
if (err)
return err;
dev_set_drvdata(&wdev->dev, priv);
return dell_wmi_input_setup(wdev);
@ -749,10 +755,6 @@ static int __init dell_wmi_init(void)
{
int err;
err = dell_wmi_check_descriptor_buffer();
if (err)
return err;
dmi_check_system(dell_wmi_smbios_list);
if (wmi_requires_smbios_request) {