[2.6.20.21 review 13/35] USB: allow retry on descriptor fetch errors

[Willy Tarreau]

This patch (as964) was suggested by Steffen Koepf.  It makes
usb_get_descriptor() retry on all errors other than ETIMEDOUT, instead
of only on EPIPE.  This helps with some devices.

Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 drivers/usb/core/message.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

Index: 2.6/drivers/usb/core/message.c
===================================================================
--- 2.6.orig/drivers/usb/core/message.c
+++ 2.6/drivers/usb/core/message.c
@@ -608,12 +608,12 @@ int usb_get_descriptor(struct usb_device
 	memset(buf,0,size);	// Make sure we parse really received data
 
 	for (i = 0; i < 3; ++i) {
-		/* retry on length 0 or stall; some devices are flakey */
+		/* retry on length 0 or error; some devices are flakey */
 		result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 				USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
 				(type << 8) + index, 0, buf, size,
 				USB_CTRL_GET_TIMEOUT);
-		if (result == 0 || result == -EPIPE)
+		if (result <= 0 && result != -ETIMEDOUT)
 			continue;
 		if (result > 1 && ((u8 *)buf)[1] != type) {
 			result = -EPROTO;

-- 
-
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