thinkpad-acpi: make driver events work in NVRAM poll mode

commit 7f0cf712a74fcc3ad21f0bde95bd32c2f2cc3888 upstream.

Thadeu Lima de Souza Cascardo reports this:

Brightness notification does not work until the user writes to
hotkey_mask attribute.  That's because the polling thread will only run
if hotkey_user_mask is set and someone is reading the input device or
if hotkey_driver_mask is set.  In this second case, this condition is
not tested after the mask is changed, because the brightness and
volume drivers are started after the hotkey drivers.

Fix tpacpi_hotkey_driver_mask_set() to call hotkey_poll_setup(), so
that the poller kthread will be started when needed.

Reported-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Tested-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 0f4b4c9261a6338fa7ba1c0099099ffad4e7c10f..b1fa915e4cff96c28eb7d2a3323723631dfb2279 100644 (file)
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -2073,6 +2073,7 @@ static struct attribute_set *hotkey_dev_attributes;
 
 static void tpacpi_driver_event(const unsigned int hkey_event);
 static void hotkey_driver_event(const unsigned int scancode);
+static void hotkey_poll_setup(const bool may_warn);
 
 /* HKEY.MHKG() return bits */
 #define TP_HOTKEY_TABLET_MASK (1 << 3)
@@ -2254,6 +2255,8 @@ static int tpacpi_hotkey_driver_mask_set(const u32 mask)
 
        rc = hotkey_mask_set((hotkey_acpi_mask | hotkey_driver_mask) &
                                                        ~hotkey_source_mask);
+       hotkey_poll_setup(true);
+
        mutex_unlock(&hotkey_mutex);
 
        return rc;
@@ -2538,7 +2541,7 @@ static void hotkey_poll_stop_sync(void)
 }
 
 /* call with hotkey_mutex held */
-static void hotkey_poll_setup(bool may_warn)
+static void hotkey_poll_setup(const bool may_warn)
 {
        const u32 poll_driver_mask = hotkey_driver_mask & hotkey_source_mask;
        const u32 poll_user_mask = hotkey_user_mask & hotkey_source_mask;
@@ -2569,7 +2572,7 @@ static void hotkey_poll_setup(bool may_warn)
        }
 }
 
-static void hotkey_poll_setup_safe(bool may_warn)
+static void hotkey_poll_setup_safe(const bool may_warn)
 {
        mutex_lock(&hotkey_mutex);
        hotkey_poll_setup(may_warn);
@@ -2587,7 +2590,11 @@ static void hotkey_poll_set_freq(unsigned int freq)
 
 #else /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
 
-static void hotkey_poll_setup_safe(bool __unused)
+static void hotkey_poll_setup(const bool __unused)
+{
+}
+
+static void hotkey_poll_setup_safe(const bool __unused)
 {
 }