From 51391caf99e34d2d75ffc428845062d93aa739c6 Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Tue, 1 Aug 2017 08:37:26 -0700 Subject: [PATCH] platform/x86: dell-wmi: Fix driver interface version query MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Pali Rohár Signed-off-by: Darren Hart (VMware) --- drivers/platform/x86/dell-wmi.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c index f897846..dad8f4a 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 * 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) { -- 2.7.4