cypress_m8: improve control endpoint error handling

Fix usb core function error return checks to look for negative errno
values, not positive errno values.  This bug had rendered those checks
useless.  Also remove attempted error recovery on control endpoints
for EPIPE - with control endpoints EPIPE does not indicate a halted
endpoint so trying to recover with usb_clear_halt() is not the correct
action.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index 741dcec..12a265c 100644 (file)
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -367,9 +367,7 @@ static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_m
                                if (tries++ >= 3)
                                        break;
 
-                               if (retval == EPIPE)
-                                       usb_clear_halt(port->serial->dev, 0x00);
-                       } while (retval != 8 && retval != ENODEV);
+                       } while (retval != 8 && retval != -ENODEV);
 
                        if (retval != 8)
                                err("%s - failed sending serial line settings - %d", __FUNCTION__, retval);
@@ -394,9 +392,7 @@ static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_m
                                if (tries++ >= 3)
                                        break;
 
-                               if (retval == EPIPE)
-                                       usb_clear_halt(port->serial->dev, 0x00);
-                       } while (retval != 5 && retval != ENODEV);
+                       } while (retval != 5 && retval != -ENODEV);
 
                        if (retval != 5) {
                                err("%s - failed to retrieve serial line settings - %d", __FUNCTION__, retval);