usb: gadget: printer: don't access file global pnp_string in function's code

In order to factor out a reusable f_printer, the function's code should
not use file global variables related to legacy printer gadget's
implementation.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/legacy/printer.c b/drivers/usb/gadget/legacy/printer.c
index db5e2f0..42c46da 100644 (file)
--- a/drivers/usb/gadget/legacy/printer.c
+++ b/drivers/usb/gadget/legacy/printer.c
@@ -86,6 +86,7 @@ struct printer_dev {
        u8                      printer_cdev_open;
        wait_queue_head_t       wait;
        unsigned                q_len;
+       char                    *pnp_string;    /* We don't own memory! */
        struct usb_function     function;
 };
 
@@ -994,10 +995,10 @@ static int printer_func_setup(struct usb_function *f,
                        if ((wIndex>>8) != dev->interface)
                                break;
 
-                       value = (pnp_string[0]<<8)|pnp_string[1];
-                       memcpy(req->buf, pnp_string, value);
+                       value = (dev->pnp_string[0] << 8) | dev->pnp_string[1];
+                       memcpy(req->buf, dev->pnp_string, value);
                        DBG(dev, "1284 PNP String: %x %s\n", value,
-                                       &pnp_string[2]);
+                                       &dev->pnp_string[2]);
                        break;
 
                case 1: /* Get Port Status */
@@ -1230,13 +1231,14 @@ static struct usb_configuration printer_cfg_driver = {
 };
 
 static int f_printer_bind_config(struct usb_configuration *c, char *pnp_str,
-                                unsigned q_len)
+                                char *pnp_string, unsigned q_len)
 {
        struct printer_dev      *dev;
        int                     status = -ENOMEM;
        size_t                  len;
 
        dev = &usb_printer_gadget;
+       dev->pnp_string = pnp_string;
 
        dev->function.name = shortname;
        dev->function.bind = printer_func_bind;
@@ -1249,7 +1251,7 @@ static int f_printer_bind_config(struct usb_configuration *c, char *pnp_str,
        INIT_LIST_HEAD(&dev->rx_buffers);
 
        if (pnp_str)
-               strlcpy(&pnp_string[2], pnp_str, PNP_STRING_LEN - 2);
+               strlcpy(&dev->pnp_string[2], pnp_str, PNP_STRING_LEN - 2);
 
        len = strlen(pnp_string);
        pnp_string[0] = (len >> 8) & 0xFF;
@@ -1292,7 +1294,7 @@ static int __init printer_do_config(struct usb_configuration *c)
                printer_cfg_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
        }
 
-       return f_printer_bind_config(c, iPNPstring, QLEN);
+       return f_printer_bind_config(c, iPNPstring, pnp_string, QLEN);
 
 }