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drivers/video/bf537-lq035.c: Add missing IS_ERR test 

lcd_device_register may return ERR_PTR, so a check is added for this value
before the dereference.  All of the other changes reorganize the error
handling code in this function to avoid duplicating all of it in the added
case.

In the original code, in one case, the global variable fb_buffer was set to
NULL in error code that appears after this variable is initialized.  This
is done now in all error handling code that has this property.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier f;
@@
f(...) { ... return ERR_PTR(...); }

@@
identifier r.f, fld;
expression x;
statement S1,S2;
@@
 x = f(...)
 ... when != IS_ERR(x)
(
 if (IS_ERR(x) ||...) S1 else S2
|
*x->fld
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Julia Lawall 2011-01-24 19:55:21 +00:00 committed by Paul Mundt
parent e88e43b0c5
commit 5dc1365cef
1 changed files with 33 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/video/bf537-lq035.c
View File

@ -696,6 +696,7 @@ static int __devinit bfin_lq035_probe(struct platform_device *pdev)
{
struct backlight_properties props;
dma_addr_t dma_handle;
int ret;
if (request_dma(CH_PPI, KBUILD_MODNAME)) {
pr_err("couldn't request PPI DMA\n");
@ -704,17 +705,16 @@ static int __devinit bfin_lq035_probe(struct platform_device *pdev)
if (request_ports()) {
pr_err("couldn't request gpio port\n");
free_dma(CH_PPI);
return -EFAULT;
ret = -EFAULT;
goto out_ports;
}
fb_buffer = dma_alloc_coherent(NULL, TOTAL_VIDEO_MEM_SIZE,
&dma_handle, GFP_KERNEL);
if (fb_buffer == NULL) {
pr_err("couldn't allocate dma buffer\n");
free_dma(CH_PPI);
free_ports();
return -ENOMEM;
ret = -ENOMEM;
goto out_dma_coherent;
}
if (L1_DATA_A_LENGTH)
@ -725,10 +725,8 @@ static int __devinit bfin_lq035_probe(struct platform_device *pdev)
if (dma_desc_table == NULL) {
pr_err("couldn't allocate dma descriptor\n");
free_dma(CH_PPI);
free_ports();
dma_free_coherent(NULL, TOTAL_VIDEO_MEM_SIZE, fb_buffer, 0);
return -ENOMEM;
ret = -ENOMEM;
goto out_table;
}
bfin_lq035_fb.screen_base = (void *)fb_buffer;
@ -771,31 +769,21 @@ static int __devinit bfin_lq035_probe(struct platform_device *pdev)
bfin_lq035_fb.pseudo_palette = kzalloc(sizeof(u32) * 16, GFP_KERNEL);
if (bfin_lq035_fb.pseudo_palette == NULL) {
pr_err("failed to allocate pseudo_palette\n");
free_dma(CH_PPI);
free_ports();
dma_free_coherent(NULL, TOTAL_VIDEO_MEM_SIZE, fb_buffer, 0);
return -ENOMEM;
ret = -ENOMEM;
goto out_palette;
}
if (fb_alloc_cmap(&bfin_lq035_fb.cmap, NBR_PALETTE, 0) < 0) {
pr_err("failed to allocate colormap (%d entries)\n",
NBR_PALETTE);
free_dma(CH_PPI);
free_ports();
dma_free_coherent(NULL, TOTAL_VIDEO_MEM_SIZE, fb_buffer, 0);
kfree(bfin_lq035_fb.pseudo_palette);
return -EFAULT;
ret = -EFAULT;
goto out_cmap;
}
if (register_framebuffer(&bfin_lq035_fb) < 0) {
pr_err("unable to register framebuffer\n");
free_dma(CH_PPI);
free_ports();
dma_free_coherent(NULL, TOTAL_VIDEO_MEM_SIZE, fb_buffer, 0);
fb_buffer = NULL;
kfree(bfin_lq035_fb.pseudo_palette);
fb_dealloc_cmap(&bfin_lq035_fb.cmap);
return -EINVAL;
ret = -EINVAL;
goto out_reg;
}
i2c_add_driver(&ad5280_driver);
@ -807,11 +795,31 @@ static int __devinit bfin_lq035_probe(struct platform_device *pdev)
lcd_dev = lcd_device_register(KBUILD_MODNAME, &pdev->dev, NULL,
&bfin_lcd_ops);
if (IS_ERR(lcd_dev)) {
pr_err("unable to register lcd\n");
ret = PTR_ERR(lcd_dev);
goto out_lcd;
}
lcd_dev->props.max_contrast = 255,
pr_info("initialized");
return 0;
out_lcd:
unregister_framebuffer(&bfin_lq035_fb);
out_reg:
fb_dealloc_cmap(&bfin_lq035_fb.cmap);
out_cmap:
kfree(bfin_lq035_fb.pseudo_palette);
out_palette:
out_table:
dma_free_coherent(NULL, TOTAL_VIDEO_MEM_SIZE, fb_buffer, 0);
fb_buffer = NULL;
out_dma_coherent:
free_ports();
out_ports:
free_dma(CH_PPI);
return ret;
}
static int __devexit bfin_lq035_remove(struct platform_device *pdev)