[PATCH] drivers/usb/core/devio.c: Check for printer class specificrequest

[Matthias Dellweg]

Signed-off-by: Matthias Dellweg <2500@xxxxxx>
---
 drivers/usb/core/devio.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 37518df..e3e60f7 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -607,7 +607,7 @@ static int findintfep(struct usb_device *dev, unsigned int ep)
 }
 
 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
-                          unsigned int index)
+                          unsigned int request, unsigned int index)
 {
        int ret = 0;
 
@@ -618,6 +618,12 @@ static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
        if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
                return 0;
 
+       /* check for a very special case in the printer class specification */
+       if ((requesttype == 0xa1) && (request == 0x00)
+        && (usb_find_alt_setting(ps->dev->actconfig, index >> 8, index & 0xff)
+        ->desc.bInterfaceClass == USB_CLASS_PRINTER))
+               index >>= 8;
+
        index &= 0xff;
        switch (requesttype & USB_RECIP_MASK) {
        case USB_RECIP_ENDPOINT:
@@ -770,7 +776,7 @@ static int proc_control(struct dev_state *ps, void __user *arg)
 
        if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
                return -EFAULT;
-       ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
+       ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest, ctrl.wIndex);
        if (ret)
                return ret;
        wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
@@ -1100,7 +1106,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
                        kfree(dr);
                        return -EINVAL;
                }
-               ret = check_ctrlrecip(ps, dr->bRequestType,
+               ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
                                      le16_to_cpup(&dr->wIndex));
                if (ret) {
                        kfree(dr);
-- 
1.7.6.3
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