diff options
| author | Weitao Hou <houweitaoo@gmail.com> | 2019-05-23 19:52:08 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-24 09:53:24 +0200 |
| commit | 086ebf92aa791b6cc8805decffca7b8898d99a4e (patch) | |
| tree | 623da57e5879fac1bd3b057ea46958ee4ccbfd6c /drivers/usb/core/devio.c | |
| parent | 6e9aed4ed4ca129510fcb1af495391d4717246d6 (diff) | |
| download | linux-086ebf92aa791b6cc8805decffca7b8898d99a4e.tar.bz2 | |
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: Weitao Hou <houweitaoo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/devio.c')
| -rw-r--r-- | drivers/usb/core/devio.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index fa783531ee88..aa17dab6c4ea 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -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))) |