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video: smscufx: Less checks in ufx_usb_probe() after error detection

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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: Markus Elfring <elfring@users.sourceforge.net>
Cc: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
This commit is contained in:
Markus Elfring 2018-03-28 16:34:27 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 3c097b069b
commit daa0524bc0
1 changed files with 19 additions and 27 deletions
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46
drivers/video/fbdev/smscufx.c
View file

@ -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)
fb_destroy_modedb(info->monspecs.modedb);
vfree(info->screen_base);
fb_destroy_modelist(&info->modelist);
framebuffer_release(info);
}
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 */
}
fb_dealloc_cmap(&info->cmap);
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 */
return retval;
e_nomem:
retval = -ENOMEM;
goto put_ref;
}
static void ufx_usb_disconnect(struct usb_interface *interface)