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USB: legousbtower: use usb_control_msg_recv()

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The usb_control_msg_recv() function can handle data on the stack, as
well as properly detecting short reads, so move to use that function
instead of the older usb_control_msg() call.  This ends up removing a
lot of extra lines in the driver.

Cc: Juergen Stuber <starblue@users.sourceforge.net>
Link: https://lore.kernel.org/r/20200914153756.3412156-6-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2020-09-14 17:37:50 +02:00
parent d6a4992495
commit be40c36641
1 changed files with 19 additions and 41 deletions
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60
drivers/usb/misc/legousbtower.c
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@ -308,15 +308,9 @@ static int tower_open(struct inode *inode, struct file *file)
int subminor;
int retval = 0;
struct usb_interface *interface;
struct tower_reset_reply *reset_reply;
struct tower_reset_reply reset_reply;
int result;
reset_reply = kmalloc(sizeof(*reset_reply), GFP_KERNEL);
if (!reset_reply) {
retval = -ENOMEM;
goto exit;
}
nonseekable_open(inode, file);
subminor = iminor(inode);
@ -347,15 +341,11 @@ static int tower_open(struct inode *inode, struct file *file)
}
/* reset the tower */
result = usb_control_msg(dev->udev,
usb_rcvctrlpipe(dev->udev, 0),
LEGO_USB_TOWER_REQUEST_RESET,
USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
0,
0,
reset_reply,
sizeof(*reset_reply),
1000);
result = usb_control_msg_recv(dev->udev, 0,
LEGO_USB_TOWER_REQUEST_RESET,
USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
0, 0,
&reset_reply, sizeof(reset_reply), 1000);
if (result < 0) {
dev_err(&dev->udev->dev,
"LEGO USB Tower reset control request failed\n");
@ -394,7 +384,6 @@ unlock_exit:
mutex_unlock(&dev->lock);
exit:
kfree(reset_reply);
return retval;
}
@ -753,7 +742,7 @@ static int tower_probe(struct usb_interface *interface, const struct usb_device_
struct device *idev = &interface->dev;
struct usb_device *udev = interface_to_usbdev(interface);
struct lego_usb_tower *dev;
struct tower_get_version_reply *get_version_reply = NULL;
struct tower_get_version_reply get_version_reply;
int retval = -ENOMEM;
int result;
@ -798,34 +787,25 @@ static int tower_probe(struct usb_interface *interface, const struct usb_device_
dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
get_version_reply = kmalloc(sizeof(*get_version_reply), GFP_KERNEL);
if (!get_version_reply) {
retval = -ENOMEM;
goto error;
}
/* get the firmware version and log it */
result = usb_control_msg(udev,
usb_rcvctrlpipe(udev, 0),
LEGO_USB_TOWER_REQUEST_GET_VERSION,
USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
0,
0,
get_version_reply,
sizeof(*get_version_reply),
1000);
if (result != sizeof(*get_version_reply)) {
if (result >= 0)
result = -EIO;
result = usb_control_msg_recv(udev, 0,
LEGO_USB_TOWER_REQUEST_GET_VERSION,
USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
0,
0,
&get_version_reply,
sizeof(get_version_reply),
1000);
if (!result) {
dev_err(idev, "get version request failed: %d\n", result);
retval = result;
goto error;
}
dev_info(&interface->dev,
"LEGO USB Tower firmware version is %d.%d build %d\n",
get_version_reply->major,
get_version_reply->minor,
le16_to_cpu(get_version_reply->build_no));
get_version_reply.major,
get_version_reply.minor,
le16_to_cpu(get_version_reply.build_no));
/* we can register the device now, as it is ready */
usb_set_intfdata(interface, dev);
@ -844,11 +824,9 @@ static int tower_probe(struct usb_interface *interface, const struct usb_device_
USB_MAJOR, dev->minor);
exit:
kfree(get_version_reply);
return retval;
error:
kfree(get_version_reply);
tower_delete(dev);
return retval;
}