Jiri Kosina wrote:
> On Sat, 4 Oct 2008, Anssi Hannula wrote:
>
>
>>> There were some changes in the code due to hidbus getting finally
>>> merged, but it should be rather trivial to solve.
>>>
>> AFAICS no changes are needed, it applies to hid.git#mm fine.
>>
>
> You are right.
>
> Could you please send me the patch with the changelog? I will then merge
> it for 2.6.28.
>
> Thanks,
>
>
From: Anssi Hannula <anssi.hannula@xxxxxxxxx>
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 <anssi.hannula@xxxxxxxxx>
---
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 07840df..1ae047c 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;
diff --git a/drivers/hid/usbhid/hid-pidff.c b/drivers/hid/usbhid/hid-pidff.c
index 0113261..484e3ee 100644
--- a/drivers/hid/usbhid/hid-pidff.c
+++ b/drivers/hid/usbhid/hid-pidff.c
@@ -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);
diff --git a/drivers/hid/usbhid/usbhid.h b/drivers/hid/usbhid/usbhid.h
index b47f991..abedb13 100644
--- a/drivers/hid/usbhid/usbhid.h
+++ b/drivers/hid/usbhid/usbhid.h
@@ -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 */
diff --git a/include/linux/hid.h b/include/linux/hid.h
index eb1844c..3e2726a 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -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
--
Anssi Hannula
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