linux-kernel - [126/197] Staging: comedi: fix usbdux timeout bug

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Date:	Thu, 22 Apr 2010 12:09:37 -0700
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,
	Leann Ogasawara <leann.ogasawara@...onical.com>
Subject: [126/197] Staging: comedi: fix usbdux timeout bug

2.6.32-stable review patch.  If anyone has any objections, please let us know.

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

From: Bernd Porr <BerndPorr@....com>

commit ea25371a78c33e276527361d3ab19393d558b2fd upstream.

I've fixed a bug in the USBDUX driver which caused timeouts while
sending commands to the boards. This was mainly because of one bulk
transfer which had a timeout of 1ms (!). I've now set all timeouts to
1000ms.

From: Bernd Porr <BerndPorr@....com>
Signed-off-by: Leann Ogasawara <leann.ogasawara@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/comedi/drivers/usbdux.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

--- a/drivers/staging/comedi/drivers/usbdux.c
+++ b/drivers/staging/comedi/drivers/usbdux.c
@@ -1,4 +1,4 @@
-#define DRIVER_VERSION "v2.2"
+#define DRIVER_VERSION "v2.3"
 #define DRIVER_AUTHOR "Bernd Porr, BerndPorr@....com"
 #define DRIVER_DESC "Stirling/ITL USB-DUX -- Bernd.Porr@....com"
 /*
@@ -80,6 +80,7 @@ sampling rate. If you sample two channel
  * 2.0:  PWM seems to be stable and is not interfering with the other functions
  * 2.1:  changed PWM API
  * 2.2:  added firmware kernel request to fix an udev problem
+ * 2.3:  corrected a bug in bulk timeouts which were far too short
  *
  */
 
@@ -101,8 +102,8 @@ sampling rate. If you sample two channel
 
 #define BOARDNAME "usbdux"
 
-/* timeout for the USB-transfer */
-#define EZTIMEOUT 30
+/* timeout for the USB-transfer in ms*/
+#define BULK_TIMEOUT 1000
 
 /* constants for "firmware" upload and download */
 #define USBDUXSUB_FIRMWARE 0xA0
@@ -750,7 +751,7 @@ static int usbduxsub_start(struct usbdux
 				  /* Length */
 				  1,
 				  /* Timeout */
-				  EZTIMEOUT);
+				  BULK_TIMEOUT);
 	if (errcode < 0) {
 		dev_err(&usbduxsub->interface->dev,
 			"comedi_: control msg failed (start)\n");
@@ -780,7 +781,7 @@ static int usbduxsub_stop(struct usbduxs
 				  /* Length */
 				  1,
 				  /* Timeout */
-				  EZTIMEOUT);
+				  BULK_TIMEOUT);
 	if (errcode < 0) {
 		dev_err(&usbduxsub->interface->dev,
 			"comedi_: control msg failed (stop)\n");
@@ -810,7 +811,7 @@ static int usbduxsub_upload(struct usbdu
 				  /* length */
 				  len,
 				  /* timeout */
-				  EZTIMEOUT);
+				  BULK_TIMEOUT);
 	dev_dbg(&usbduxsub->interface->dev, "comedi_: result=%d\n", errcode);
 	if (errcode < 0) {
 		dev_err(&usbduxsub->interface->dev, "comedi_: upload failed\n");
@@ -1110,7 +1111,7 @@ static int send_dux_commands(struct usbd
 			      usb_sndbulkpipe(this_usbduxsub->usbdev,
 					      COMMAND_OUT_EP),
 			      this_usbduxsub->dux_commands, SIZEOFDUXBUFFER,
-			      &nsent, 10);
+			      &nsent, BULK_TIMEOUT);
 	if (result < 0)
 		dev_err(&this_usbduxsub->interface->dev, "comedi%d: "
 			"could not transmit dux_command to the usb-device, "
@@ -1130,7 +1131,7 @@ static int receive_dux_commands(struct u
 				      usb_rcvbulkpipe(this_usbduxsub->usbdev,
 						      COMMAND_IN_EP),
 				      this_usbduxsub->insnBuffer, SIZEINSNBUF,
-				      &nrec, 1);
+				      &nrec, BULK_TIMEOUT);
 		if (result < 0) {
 			dev_err(&this_usbduxsub->interface->dev, "comedi%d: "
 				"insn: USB error %d while receiving DUX command"


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