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| author | Andy Lutomirski <luto@kernel.org> | 2017-08-01 17:37:26 +0200 |
|---|---|---|
| committer | Darren Hart (VMware) <dvhart@infradead.org> | 2017-08-01 22:53:49 +0200 |
| commit | baa5480b0509d8af06c37fff03edbb5a6815cef1 (patch) | |
| tree | 306dc6c9c9125454d427db70ff8ff5b2b5eefc05 /drivers/platform | |
| parent | platform/x86: intel_telemetry: remove redundant macro definition (diff) | |
| download | linux-baa5480b0509d8af06c37fff03edbb5a6815cef1.tar.xz linux-baa5480b0509d8af06c37fff03edbb5a6815cef1.zip | |
platform/x86: dell-wmi: Fix driver interface version query
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: bff589be59c5 ("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>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/dell-wmi.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c index f8978464df31..dad8f4afa17c 100644 --- a/drivers/platform/x86/dell-wmi.c +++ b/drivers/platform/x86/dell-wmi.c @@ -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) { |