linux-kernel - [patch 008/123] HID: usbhid: introduce timeout for stuck ctrl/out URBs

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Message-Id: <20100313001505.873349402@kvm.kroah.org>
Date:	Fri, 12 Mar 2010 16:11:46 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Oliver Neukum <oliver@...kum.org>,
	David Fries <david@...es.net>, Jiri Kosina <jkosina@...e.cz>
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@...kum.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@...kum.org>
Signed-off-by: David Fries <david@...es.net>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.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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