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Commit 086ebf92 authored by Weitao Hou's avatar Weitao Hou Committed by Greg Kroah-Hartman
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usb: avoid redundant allocation and free of memory 



If usb is not attached, it's unnessary to allocate, copy
and free memory

Signed-off-by: default avatarWeitao Hou <houweitaoo@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6e9aed4e

drivers/usb/core/devio.c

+3 −5
Original line number Diff line number Diff line
@@ -2130,6 +2130,9 @@ static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl) 
	if (ps->privileges_dropped)

		return -EACCES;



	if (!connected(ps))

		return -ENODEV;



	/* alloc buffer */

	size = _IOC_SIZE(ctl->ioctl_code);

	if (size > 0) {
@@ -2146,11 +2149,6 @@ static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl) 
		}

	}



	if (!connected(ps)) {

		kfree(buf);

		return -ENODEV;

	}



	if (ps->dev->state != USB_STATE_CONFIGURED)

		retval = -EHOSTUNREACH;

	else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))