[PATCH] USB: g_file_storage: Consolidate min()s
This patch simplifies the g_file_storage driver by consolidating a bunch
of min() calculations at a single spot.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index a9be851..507a249 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -1312,7 +1312,7 @@
}
VDBG(fsg, "get max LUN\n");
*(u8 *) req->buf = fsg->nluns - 1;
- value = min(w_length, (u16) 1);
+ value = 1;
break;
}
}
@@ -1360,7 +1360,6 @@
int value = -EOPNOTSUPP;
u16 w_index = ctrl->wIndex;
u16 w_value = ctrl->wValue;
- u16 w_length = ctrl->wLength;
/* Usually this just stores reply data in the pre-allocated ep0 buffer,
* but config change events will also reconfigure hardware. */
@@ -1374,7 +1373,7 @@
case USB_DT_DEVICE:
VDBG(fsg, "get device descriptor\n");
- value = min(w_length, (u16) sizeof device_desc);
+ value = sizeof device_desc;
memcpy(req->buf, &device_desc, value);
break;
#ifdef CONFIG_USB_GADGET_DUALSPEED
@@ -1382,7 +1381,7 @@
VDBG(fsg, "get device qualifier\n");
if (!fsg->gadget->is_dualspeed)
break;
- value = min(w_length, (u16) sizeof dev_qualifier);
+ value = sizeof dev_qualifier;
memcpy(req->buf, &dev_qualifier, value);
break;
@@ -1401,8 +1400,6 @@
req->buf,
w_value >> 8,
w_value & 0xff);
- if (value >= 0)
- value = min(w_length, (u16) value);
break;
case USB_DT_STRING:
@@ -1411,8 +1408,6 @@
/* wIndex == language code */
value = usb_gadget_get_string(&stringtab,
w_value & 0xff, req->buf);
- if (value >= 0)
- value = min(w_length, (u16) value);
break;
}
break;
@@ -1438,7 +1433,7 @@
break;
VDBG(fsg, "get configuration\n");
*(u8 *) req->buf = fsg->config;
- value = min(w_length, (u16) 1);
+ value = 1;
break;
case USB_REQ_SET_INTERFACE:
@@ -1466,14 +1461,14 @@
}
VDBG(fsg, "get interface\n");
*(u8 *) req->buf = 0;
- value = min(w_length, (u16) 1);
+ value = 1;
break;
default:
VDBG(fsg,
"unknown control req %02x.%02x v%04x i%04x l%u\n",
ctrl->bRequestType, ctrl->bRequest,
- w_value, w_index, w_length);
+ w_value, w_index, ctrl->wLength);
}
return value;
@@ -1485,6 +1480,7 @@
{
struct fsg_dev *fsg = get_gadget_data(gadget);
int rc;
+ int w_length = ctrl->wLength;
++fsg->ep0_req_tag; // Record arrival of a new request
fsg->ep0req->context = NULL;
@@ -1498,8 +1494,9 @@
/* Respond with data/status or defer until later? */
if (rc >= 0 && rc != DELAYED_STATUS) {
+ rc = min(rc, w_length);
fsg->ep0req->length = rc;
- fsg->ep0req->zero = (rc < ctrl->wLength &&
+ fsg->ep0req->zero = (rc < w_length &&
(rc % gadget->ep0->maxpacket) == 0);
fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ?
"ep0-in" : "ep0-out");