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Subject[patch 008/123] HID: usbhid: introduce timeout for stuck ctrl/out URBs
2.6.33-stable review patch.  If anyone has any objections, please let me know.

-----------------

From: Oliver Neukum <oliver@neukum.org>

commit 858155fbcc0cd713f6382c527bb1c3abc0ed6d00 upstream.

Some devices do not react to a control request (seen on APC UPS's) resulting in
a slow stream of messages, "generic-usb ... control queue full". Therefore
request needs a timeout.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: David Fries <david@fries.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/hid/usbhid/hid-core.c | 28 ++++++++++++++++++++++++++--
drivers/hid/usbhid/usbhid.h | 2 ++
2 files changed, 28 insertions(+), 2 deletions(-)

--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -316,6 +316,7 @@ static int hid_submit_out(struct hid_dev
err_hid("usb_submit_urb(out) failed");
return -1;
}
+ usbhid->last_out = jiffies;
} else {
/*
* queue work to wake up the device.
@@ -377,6 +378,7 @@ static int hid_submit_ctrl(struct hid_de
err_hid("usb_submit_urb(ctrl) failed");
return -1;
}
+ usbhid->last_ctrl = jiffies;
} else {
/*
* queue work to wake up the device.
@@ -512,9 +514,20 @@ static void __usbhid_submit_report(struc
usbhid->out[usbhid->outhead].report = report;
usbhid->outhead = head;

- if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl))
+ if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
if (hid_submit_out(hid))
clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
+ } else {
+ /*
+ * the queue is known to run
+ * but an earlier request may be stuck
+ * we may need to time out
+ * no race because this is called under
+ * spinlock
+ */
+ if (time_after(jiffies, usbhid->last_out + HZ * 5))
+ usb_unlink_urb(usbhid->urbout);
+ }
return;
}

@@ -535,9 +548,20 @@ static void __usbhid_submit_report(struc
usbhid->ctrl[usbhid->ctrlhead].dir = dir;
usbhid->ctrlhead = head;

- if (!test_and_set_bit(HID_CTRL_RUNNING, &usbhid->iofl))
+ if (!test_and_set_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
if (hid_submit_ctrl(hid))
clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
+ } else {
+ /*
+ * the queue is known to run
+ * but an earlier request may be stuck
+ * we may need to time out
+ * no race because this is called under
+ * spinlock
+ */
+ if (time_after(jiffies, usbhid->last_ctrl + HZ * 5))
+ usb_unlink_urb(usbhid->urbctrl);
+ }
}

void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
--- a/drivers/hid/usbhid/usbhid.h
+++ b/drivers/hid/usbhid/usbhid.h
@@ -80,12 +80,14 @@ struct usbhid_device {
unsigned char ctrlhead, ctrltail; /* Control fifo head & tail */
char *ctrlbuf; /* Control buffer */
dma_addr_t ctrlbuf_dma; /* Control buffer dma */
+ unsigned long last_ctrl; /* record of last output for timeouts */

struct urb *urbout; /* Output URB */
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 */
+ unsigned long last_out; /* record of last output for timeouts */

spinlock_t lock; /* fifo spinlock */
unsigned long iofl; /* I/O flags (CTRL_RUNNING, OUT_RUNNING) */



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