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Commit f129ea6d authored by Anssi Hannula's avatar Anssi Hannula Committed by Jiri Kosina
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HID: fix a lockup regression when using force feedback on a PID device 



Commit 8006479c introduced a spinlock in
input_dev->event_lock, which is locked when handling input events.
However, the hid-pidff driver sleeps when handling events as it waits for
reports being sent to the device before changing the report contents
again.
This causes a system lockup when trying to use force feedback with a PID
device, a regression introduced in 2.6.24 and 2.6.23.15.

Fix it by extracting the raw report data from struct hid_report
immediately when hid_submit_report() is called, therefore allowing
drivers to change the contents of struct hid_report immediately without
affecting the already-queued transfer.

In hid-pidff, re-add the removed usbhid_wait_io() to
pidff_erase_effect() instead, to prevent a full report queue from causing
the submission to fail, thus not freeing up device memory.
pidff_erase_effect() is not called while dev->event_lock is held.

Signed-off-by: default avatarAnssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent dded364b

drivers/hid/usbhid/hid-core.c

+27 −4
Original line number Diff line number Diff line
@@ -232,13 +232,16 @@ static void hid_irq_in(struct urb *urb) 
static int hid_submit_out(struct hid_device *hid)

{

	struct hid_report *report;

	char *raw_report;

	struct usbhid_device *usbhid = hid->driver_data;



	report = usbhid->out[usbhid->outtail];

	report = usbhid->out[usbhid->outtail].report;

	raw_report = usbhid->out[usbhid->outtail].raw_report;



	hid_output_report(report, usbhid->outbuf);

	usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) + 1 + (report->id > 0);

	usbhid->urbout->dev = hid_to_usb_dev(hid);

	memcpy(usbhid->outbuf, raw_report, usbhid->urbout->transfer_buffer_length);

	kfree(raw_report);



	dbg_hid("submitting out urb\n");
@@ -254,17 +257,20 @@ static int hid_submit_ctrl(struct hid_device *hid) 
{

	struct hid_report *report;

	unsigned char dir;

	char *raw_report;

	int len;

	struct usbhid_device *usbhid = hid->driver_data;



	report = usbhid->ctrl[usbhid->ctrltail].report;

	raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;

	dir = usbhid->ctrl[usbhid->ctrltail].dir;



	len = ((report->size - 1) >> 3) + 1 + (report->id > 0);

	if (dir == USB_DIR_OUT) {

		hid_output_report(report, usbhid->ctrlbuf);

		usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);

		usbhid->urbctrl->transfer_buffer_length = len;

		memcpy(usbhid->ctrlbuf, raw_report, len);

		kfree(raw_report);

	} else {

		int maxpacket, padlen;
@@ -401,6 +407,7 @@ void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, uns 
	int head;

	unsigned long flags;

	struct usbhid_device *usbhid = hid->driver_data;

	int len = ((report->size - 1) >> 3) + 1 + (report->id > 0);



	if ((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN)

		return;
@@ -415,7 +422,14 @@ void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, uns 
			return;

		}



		usbhid->out[usbhid->outhead] = report;

		usbhid->out[usbhid->outhead].raw_report = kmalloc(len, GFP_ATOMIC);

		if (!usbhid->out[usbhid->outhead].raw_report) {

			spin_unlock_irqrestore(&usbhid->outlock, flags);

			warn("output queueing failed");

			return;

		}

		hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);

		usbhid->out[usbhid->outhead].report = report;

		usbhid->outhead = head;



		if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl))
@@ -434,6 +448,15 @@ void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, uns 
		return;

	}



	if (dir == USB_DIR_OUT) {

		usbhid->ctrl[usbhid->ctrlhead].raw_report = kmalloc(len, GFP_ATOMIC);

		if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {

			spin_unlock_irqrestore(&usbhid->ctrllock, flags);

			warn("control queueing failed");

			return;

		}

		hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);

	}

	usbhid->ctrl[usbhid->ctrlhead].report = report;

	usbhid->ctrl[usbhid->ctrlhead].dir = dir;

	usbhid->ctrlhead = head;

drivers/hid/usbhid/hid-pidff.c

+3 −2
Original line number Diff line number Diff line
@@ -397,7 +397,6 @@ static void pidff_set_condition_report(struct pidff_device *pidff, 
			  effect->u.condition[i].left_saturation);

		pidff_set(&pidff->set_condition[PID_DEAD_BAND],

			  effect->u.condition[i].deadband);

		usbhid_wait_io(pidff->hid);

		usbhid_submit_report(pidff->hid, pidff->reports[PID_SET_CONDITION],

				  USB_DIR_OUT);

	}
@@ -512,7 +511,6 @@ static void pidff_playback_pid(struct pidff_device *pidff, int pid_id, int n) 
		pidff->effect_operation[PID_LOOP_COUNT].value[0] = n;

	}



	usbhid_wait_io(pidff->hid);

	usbhid_submit_report(pidff->hid, pidff->reports[PID_EFFECT_OPERATION],

			  USB_DIR_OUT);

}
@@ -548,6 +546,9 @@ static int pidff_erase_effect(struct input_dev *dev, int effect_id) 
	int pid_id = pidff->pid_id[effect_id];



	debug("starting to erase %d/%d", effect_id, pidff->pid_id[effect_id]);

	/* Wait for the queue to clear. We do not want a full fifo to

	   prevent the effect removal. */

	usbhid_wait_io(pidff->hid);

	pidff_playback_pid(pidff, pid_id, 0);

	pidff_erase_pid(pidff, pid_id);

drivers/hid/usbhid/usbhid.h

+1 −1
Original line number Diff line number Diff line
@@ -67,7 +67,7 @@ struct usbhid_device { 
	spinlock_t ctrllock;                                            /* Control fifo spinlock */



	struct urb *urbout;                                             /* Output URB */

	struct hid_report *out[HID_CONTROL_FIFO_SIZE];                  /* Output pipe fifo */

	struct hid_output_fifo out[HID_CONTROL_FIFO_SIZE];              /* Output pipe fifo */

	unsigned char outhead, outtail;                                 /* Output pipe fifo head & tail */

	char *outbuf;                                                   /* Output buffer */

	dma_addr_t outbuf_dma;                                          /* Output buffer dma */

include/linux/hid.h

+6 −0
Original line number Diff line number Diff line
@@ -388,6 +388,12 @@ struct hid_report_enum { 
struct hid_control_fifo {

	unsigned char dir;

	struct hid_report *report;

	char *raw_report;

};



struct hid_output_fifo {

	struct hid_report *report;

	char *raw_report;

};



#define HID_CLAIMED_INPUT	1