From: Hans de Goede <hdegoede@xxxxxxxxxx> [ Upstream commit a90b38c58667142ecff2521481ed44286d46b140 ] Replace the wmi_block.read_takes_no_args bool field with an unsigned long flags field, used together with test_bit() and friends. This is a preparation patch for fixing a driver->notify() vs ->probe() race, which requires atomic flag handling. Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Link: https://lore.kernel.org/r/20211128190031.405620-1-hdegoede@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/platform/x86/wmi.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index 9aeb1a009097..a00b72ace6d2 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -51,6 +51,10 @@ struct guid_block { u8 flags; }; +enum { /* wmi_block flags */ + WMI_READ_TAKES_NO_ARGS, +}; + struct wmi_block { struct wmi_device dev; struct list_head list; @@ -61,8 +65,7 @@ struct wmi_block { wmi_notify_handler handler; void *handler_data; u64 req_buf_size; - - bool read_takes_no_args; + unsigned long flags; }; @@ -325,7 +328,7 @@ static acpi_status __query_block(struct wmi_block *wblock, u8 instance, wq_params[0].type = ACPI_TYPE_INTEGER; wq_params[0].integer.value = instance; - if (instance == 0 && wblock->read_takes_no_args) + if (instance == 0 && test_bit(WMI_READ_TAKES_NO_ARGS, &wblock->flags)) input.count = 0; /* @@ -1087,7 +1090,7 @@ static int wmi_create_device(struct device *wmi_bus_dev, * laptops, WQxx may not be a method at all.) */ if (info->type != ACPI_TYPE_METHOD || info->param_count == 0) - wblock->read_takes_no_args = true; + set_bit(WMI_READ_TAKES_NO_ARGS, &wblock->flags); kfree(info); -- 2.35.1
