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    SubjectRe: [PATCH] grvga: Fix error handling issues
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    The of_ioremap function is used in this code as well and I don't know of
    a devm_ equivalent for it. For consistency I think it is better to leave
    it as it is in this case. So I stick with v1 of this patch.

    Thanks,

    Emil

    On Fri, 2012-06-22 at 18:21 +0200, Julia Lawall wrote:
    > On Fri, 22 Jun 2012, Emil Goode wrote:
    >
    > > Good idea, I will take another look at it tomorrow.
    >
    > There is a devm_ function that combines request_mem_region and ioremap
    > that could be useful.
    >
    > julia
    >
    > >
    > > 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@gmail.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@vger.kernel.org
    > > > > More majordomo info at http://vger.kernel.org/majordomo-info.html
    > > > >
    > >
    > >
    > > --
    > > To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
    > > the body of a message to majordomo@vger.kernel.org
    > > More majordomo info at http://vger.kernel.org/majordomo-info.html
    > >




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