From f129ea6d1efe0eddcbb1f0faaec5623788ad9e58 Mon Sep 17 00:00:00 2001 From: Anssi Hannula Date: Sat, 4 Oct 2008 14:44:06 +0200 Subject: HID: fix a lockup regression when using force feedback on a PID device Commit 8006479c9b75fb6594a7b746af3d7f1fbb68f18f 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: Anssi Hannula Signed-off-by: Jiri Kosina --- drivers/hid/usbhid/hid-core.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) (limited to 'drivers/hid/usbhid/hid-core.c') diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c index 07840df56c6..1ae047cd4fa 100644 --- a/drivers/hid/usbhid/hid-core.c +++ b/drivers/hid/usbhid/hid-core.c @@ -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; -- cgit v1.2.3