[PATCH] xHCI: Use kcalloc instead of kzalloc to allocate array

[PATCH] xHCI: Use kcalloc instead of kzalloc to allocate array

[Thomas Meyer]

The advantage of kcalloc is, that will prevent integer overflows which could
result from the multiplication of number of elements and size and it is also
a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
---

diff -u -p a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
--- a/drivers/usb/host/xhci-mem.c 2011-11-28 19:36:48.020115250 +0100
+++ b/drivers/usb/host/xhci-mem.c 2011-11-28 20:06:14.528280517 +0100
@@ -2037,11 +2037,12 @@ static int xhci_setup_port_arrays(struct
 	}
 
 	num_ports = HCS_MAX_PORTS(xhci->hcs_params1);
-	xhci->port_array = kzalloc(sizeof(*xhci->port_array)*num_ports, flags);
+	xhci->port_array = kcalloc(num_ports, sizeof(*xhci->port_array),
+				   flags);
 	if (!xhci->port_array)
 		return -ENOMEM;
 
-	xhci->rh_bw = kzalloc(sizeof(*xhci->rh_bw)*num_ports, flags);
+	xhci->rh_bw = kcalloc(num_ports, sizeof(*xhci->rh_bw), flags);
 	if (!xhci->rh_bw)
 		return -ENOMEM;
 	for (i = 0; i < num_ports; i++) {