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Date: Fri, 22 Jun 2012 18:20:44 +0200
From: Emil Goode <emilgoode@...il.com>
To: Julia Lawall <julia.lawall@...6.fr>
Cc: FlorianSchandinat@....de, linux-fbdev@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] grvga: Fix error handling issues
Good idea, I will take another look at it tomorrow.
Thanks,
Emil
On Fri, 2012-06-22 at 18:12 +0200, Julia Lawall wrote:
> Maybe you could used the devm_ functions for request_mem_region and
> ioremap so that the error handling can just be dropped?
>
> julia
>
> On Fri, 22 Jun 2012, Emil Goode wrote:
>
> > This patch fixes two problems with the error handling in the
> > grvga_probe function.
> >
> > - If the call to grvga_parse_custom on line 370 fails we use
> > the wrong label so that release_mem_region will be called
> > without a call to request_mem_region being made.
> >
> > - If the call to ioremap on line 436 fails we should not try
> > to call iounmap. I added an if statement to check whether or
> > not a call to iounmap should be made.
> >
> > - I also changed the names of the labels to make the code
> > easier to read.
> >
> > Signed-off-by: Emil Goode <emilgoode@...il.com>
> > ---
> > drivers/video/grvga.c | 34 ++++++++++++++++++----------------
> > 1 file changed, 18 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/video/grvga.c b/drivers/video/grvga.c
> > index da066c2..d9d688a 100644
> > --- a/drivers/video/grvga.c
> > +++ b/drivers/video/grvga.c
> > @@ -354,7 +354,7 @@ static int __devinit grvga_probe(struct platform_device *dev)
> > */
> > if (fb_get_options("grvga", &options)) {
> > retval = -ENODEV;
> > - goto err;
> > + goto free_fb;
> > }
> >
> > if (!options || !*options)
> > @@ -370,7 +370,7 @@ static int __devinit grvga_probe(struct platform_device *dev)
> > if (grvga_parse_custom(this_opt, &info->var) < 0) {
> > dev_err(&dev->dev, "Failed to parse custom mode (%s).\n", this_opt);
> > retval = -EINVAL;
> > - goto err1;
> > + goto free_fb;
> > }
> > } else if (!strncmp(this_opt, "addr", 4))
> > grvga_fix_addr = simple_strtoul(this_opt + 5, NULL, 16);
> > @@ -390,7 +390,7 @@ static int __devinit grvga_probe(struct platform_device *dev)
> > if (!request_mem_region(dev->resource[0].start, resource_size(&dev->resource[0]), "grlib-svgactrl regs")) {
> > dev_err(&dev->dev, "registers already mapped\n");
> > retval = -EBUSY;
> > - goto err;
> > + goto free_fb;
> > }
> >
> > par->regs = of_ioremap(&dev->resource[0], 0,
> > @@ -400,14 +400,14 @@ static int __devinit grvga_probe(struct platform_device *dev)
> > if (!par->regs) {
> > dev_err(&dev->dev, "failed to map registers\n");
> > retval = -ENOMEM;
> > - goto err1;
> > + goto release_regs;
> > }
> >
> > retval = fb_alloc_cmap(&info->cmap, 256, 0);
> > if (retval < 0) {
> > dev_err(&dev->dev, "failed to allocate mem with fb_alloc_cmap\n");
> > retval = -ENOMEM;
> > - goto err2;
> > + goto unmap_regs;
> > }
> >
> > if (mode_opt) {
> > @@ -415,7 +415,7 @@ static int __devinit grvga_probe(struct platform_device *dev)
> > grvga_modedb, sizeof(grvga_modedb), &grvga_modedb[0], 8);
> > if (!retval || retval == 4) {
> > retval = -EINVAL;
> > - goto err3;
> > + goto dealloc_cmap;
> > }
> > }
> >
> > @@ -430,7 +430,7 @@ static int __devinit grvga_probe(struct platform_device *dev)
> > if (!request_mem_region(physical_start, grvga_mem_size, dev->name)) {
> > dev_err(&dev->dev, "failed to request memory region\n");
> > retval = -ENOMEM;
> > - goto err3;
> > + goto dealloc_cmap;
> > }
> >
> > virtual_start = (unsigned long) ioremap(physical_start, grvga_mem_size);
> > @@ -438,7 +438,7 @@ static int __devinit grvga_probe(struct platform_device *dev)
> > if (!virtual_start) {
> > dev_err(&dev->dev, "error mapping framebuffer memory\n");
> > retval = -ENOMEM;
> > - goto err4;
> > + goto free_mem;
> > }
> > } else { /* Allocate frambuffer memory */
> >
> > @@ -451,7 +451,7 @@ static int __devinit grvga_probe(struct platform_device *dev)
> > "unable to allocate framebuffer memory (%lu bytes)\n",
> > grvga_mem_size);
> > retval = -ENOMEM;
> > - goto err3;
> > + goto dealloc_cmap;
> > }
> >
> > physical_start = dma_map_single(&dev->dev, (void *)virtual_start, grvga_mem_size, DMA_TO_DEVICE);
> > @@ -484,7 +484,7 @@ static int __devinit grvga_probe(struct platform_device *dev)
> > retval = register_framebuffer(info);
> > if (retval < 0) {
> > dev_err(&dev->dev, "failed to register framebuffer\n");
> > - goto err4;
> > + goto free_mem;
> > }
> >
> > __raw_writel(physical_start, &par->regs->fb_pos);
> > @@ -493,21 +493,23 @@ static int __devinit grvga_probe(struct platform_device *dev)
> >
> > return 0;
> >
> > -err4:
> > +free_mem:
> > dev_set_drvdata(&dev->dev, NULL);
> > if (grvga_fix_addr) {
> > release_mem_region(physical_start, grvga_mem_size);
> > - iounmap((void *)virtual_start);
> > + if (virtual_start)
> > + iounmap((void *)virtual_start);
> > } else
> > kfree((void *)virtual_start);
> > -err3:
> > +
> > +dealloc_cmap:
> > fb_dealloc_cmap(&info->cmap);
> > -err2:
> > +unmap_regs:
> > of_iounmap(&dev->resource[0], par->regs,
> > resource_size(&dev->resource[0]));
> > -err1:
> > +release_regs:
> > release_mem_region(dev->resource[0].start, resource_size(&dev->resource[0]));
> > -err:
> > +free_fb:
> > framebuffer_release(info);
> >
> > return retval;
> > --
> > 1.7.10
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> >
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