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Commit daa0524b authored by Markus Elfring's avatar Markus Elfring Committed by Bartlomiej Zolnierkiewicz
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video: smscufx: Less checks in ufx_usb_probe() after error detection 



Up to four checks could be repeated by the ufx_usb_probe() function
during error handling even if the relevant properties can be determined
for the involved variables before by source code analysis.

* Return directly after a call of the function "kzalloc" failed
  at the beginning.

* Adjust jump targets so that extra checks can be omitted at the end.

* Delete initialisations for the variables "info" and "retval"
  which became unnecessary with this refactoring.

Signed-off-by: default avatarMarkus Elfring <elfring@users.sourceforge.net>
Cc: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
parent 3c097b06

drivers/video/fbdev/smscufx.c

+19 −27
Original line number Diff line number Diff line
@@ -1620,8 +1620,8 @@ static int ufx_usb_probe(struct usb_interface *interface, 
{

	struct usb_device *usbdev;

	struct ufx_data *dev;

	struct fb_info *info = NULL;

	int retval = -ENOMEM;

	struct fb_info *info;

	int retval;

	u32 id_rev, fpga_rev;



	/* usb initialization */
@@ -1631,7 +1631,7 @@ static int ufx_usb_probe(struct usb_interface *interface, 
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);

	if (dev == NULL) {

		dev_err(&usbdev->dev, "ufx_usb_probe: failed alloc of dev struct\n");

		goto error;

		return -ENOMEM;

	}



	/* we need to wait for both usb and fbdev to spin down on disconnect */
@@ -1652,9 +1652,8 @@ static int ufx_usb_probe(struct usb_interface *interface, 
	dev_dbg(dev->gdev, "fb_defio enable=%d\n", fb_defio);



	if (!ufx_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {

		retval = -ENOMEM;

		dev_err(dev->gdev, "ufx_alloc_urb_list failed\n");

		goto error;

		goto e_nomem;

	}



	/* We don't register a new USB class. Our client interface is fbdev */
@@ -1662,9 +1661,8 @@ static int ufx_usb_probe(struct usb_interface *interface, 
	/* allocates framebuffer driver structure, not framebuffer memory */

	info = framebuffer_alloc(0, &usbdev->dev);

	if (!info) {

		retval = -ENOMEM;

		dev_err(dev->gdev, "framebuffer_alloc failed\n");

		goto error;

		goto e_nomem;

	}



	dev->info = info;
@@ -1675,7 +1673,7 @@ static int ufx_usb_probe(struct usb_interface *interface, 
	retval = fb_alloc_cmap(&info->cmap, 256, 0);

	if (retval < 0) {

		dev_err(dev->gdev, "fb_alloc_cmap failed %x\n", retval);

		goto error;

		goto destroy_modedb;

	}



	INIT_DELAYED_WORK(&dev->free_framebuffer_work,
@@ -1736,26 +1734,20 @@ static int ufx_usb_probe(struct usb_interface *interface, 
	return 0;



error:

	if (dev) {

		if (info) {

			if (info->cmap.len != 0)

	fb_dealloc_cmap(&info->cmap);

			if (info->monspecs.modedb)

destroy_modedb:

	fb_destroy_modedb(info->monspecs.modedb);

	vfree(info->screen_base);



	fb_destroy_modelist(&info->modelist);



	framebuffer_release(info);

		}



put_ref:

	kref_put(&dev->kref, ufx_free); /* ref for framebuffer */

	kref_put(&dev->kref, ufx_free); /* last ref from kref_init */



		/* dev has been deallocated. Do not dereference */

	}



	return retval;



e_nomem:

	retval = -ENOMEM;

	goto put_ref;

}



static void ufx_usb_disconnect(struct usb_interface *interface)