From 9f323b681139d99beb456aff08cf339b29f3c78d Mon Sep 17 00:00:00 2001 From: Sven Eckelmann Date: Sun, 17 Nov 2013 20:38:21 +0100 Subject: [PATCH] HID: sony: Send FF commands in non-atomic context The ff_memless has a timer running which gets run in an atomic context and calls the play_effect callback. The callback function for sony uses the hid_output_raw_report (overwritten by sixaxis_usb_output_raw_report) function to handle differences in the control message format. It is not safe for an atomic context because it may sleep later in usb_start_wait_urb. This "scheduling while atomic" can cause the system to lock up. A workaround is to make the force feedback state update using work_queues and use the play_effect function only to enqueue the work item. Reported-by: Simon Wood Reported-by: David Herrmann Signed-off-by: Sven Eckelmann Signed-off-by: Simon Wood Signed-off-by: Jiri Kosina --- drivers/hid/hid-sony.c | 53 +++++++++++++++++++++++++++++++++--------- 1 file changed, 42 insertions(+), 11 deletions(-) diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c index da551d113762..098af2f84b8c 100644 --- a/drivers/hid/hid-sony.c +++ b/drivers/hid/hid-sony.c @@ -225,6 +225,13 @@ static const unsigned int buzz_keymap[] = { struct sony_sc { unsigned long quirks; +#ifdef CONFIG_SONY_FF + struct work_struct rumble_worker; + struct hid_device *hdev; + __u8 left; + __u8 right; +#endif + void *extra; }; @@ -615,9 +622,9 @@ static void buzz_remove(struct hid_device *hdev) } #ifdef CONFIG_SONY_FF -static int sony_play_effect(struct input_dev *dev, void *data, - struct ff_effect *effect) +static void sony_rumble_worker(struct work_struct *work) { + struct sony_sc *sc = container_of(work, struct sony_sc, rumble_worker); unsigned char buf[] = { 0x01, 0x00, 0xff, 0x00, 0xff, 0x00, @@ -628,21 +635,28 @@ static int sony_play_effect(struct input_dev *dev, void *data, 0xff, 0x27, 0x10, 0x00, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00 }; - __u8 left; - __u8 right; + + buf[3] = sc->right; + buf[5] = sc->left; + + sc->hdev->hid_output_raw_report(sc->hdev, buf, sizeof(buf), + HID_OUTPUT_REPORT); +} + +static int sony_play_effect(struct input_dev *dev, void *data, + struct ff_effect *effect) +{ struct hid_device *hid = input_get_drvdata(dev); + struct sony_sc *sc = hid_get_drvdata(hid); if (effect->type != FF_RUMBLE) return 0; - left = effect->u.rumble.strong_magnitude / 256; - right = effect->u.rumble.weak_magnitude ? 1 : 0; - - buf[3] = right; - buf[5] = left; + sc->left = effect->u.rumble.strong_magnitude / 256; + sc->right = effect->u.rumble.weak_magnitude ? 1 : 0; - return hid->hid_output_raw_report(hid, buf, sizeof(buf), - HID_OUTPUT_REPORT); + schedule_work(&sc->rumble_worker); + return 0; } static int sony_init_ff(struct hid_device *hdev) @@ -650,16 +664,31 @@ static int sony_init_ff(struct hid_device *hdev) struct hid_input *hidinput = list_entry(hdev->inputs.next, struct hid_input, list); struct input_dev *input_dev = hidinput->input; + struct sony_sc *sc = hid_get_drvdata(hdev); + + sc->hdev = hdev; + INIT_WORK(&sc->rumble_worker, sony_rumble_worker); input_set_capability(input_dev, EV_FF, FF_RUMBLE); return input_ff_create_memless(input_dev, NULL, sony_play_effect); } +static void sony_destroy_ff(struct hid_device *hdev) +{ + struct sony_sc *sc = hid_get_drvdata(hdev); + + cancel_work_sync(&sc->rumble_worker); +} + #else static int sony_init_ff(struct hid_device *hdev) { return 0; } + +static void sony_destroy_ff(struct hid_device *hdev) +{ +} #endif static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id) @@ -728,6 +757,8 @@ static void sony_remove(struct hid_device *hdev) if (sc->quirks & BUZZ_CONTROLLER) buzz_remove(hdev); + sony_destroy_ff(hdev); + hid_hw_stop(hdev); } -- 2.20.1