Right now, an USB_REQUEST ioctl will fail with an EBADF error if done
on a device opened as read-only. With this patch, the ioctl will fail
only if the USB_REQUEST is a write request.
Index: sys/dev/usb/usb.c
===================================================================
RCS file: /cvs/src/sys/dev/usb/usb.c,v
retrieving revision 1.107
diff -u -p -r1.107 usb.c
--- sys/dev/usb/usb.c 14 Mar 2015 03:38:50 -0000 1.107
+++ sys/dev/usb/usb.c 26 Jul 2015 16:16:52 -0000
@@ -618,7 +618,8 @@ usbioctl(dev_t devt, u_long cmd, caddr_t
usbd_status err;
int error = 0;
- if (!(flag & FWRITE))
+ if ((flag & FWRITE) == 0
+ && (ur->ucr_request.bmRequestType & UT_READ) == 0)
return (EBADF);
DPRINTF(("usbioctl: USB_REQUEST addr=%d len=%d\n", addr, len));
