USB: allow retry on descriptor fetch errors

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@rowland.harvard.edu>
CC: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index b6bd05e3d439..5498506e9c5e 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -637,12 +637,12 @@ int usb_get_descriptor(struct usb_device *dev, unsigned char type, unsigned char
         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;