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Message-Id: <1340663852-11719-1-git-send-email-emilgoode@gmail.com>
Date: Tue, 26 Jun 2012 00:37:32 +0200
From: Emil Goode <emilgoode@...il.com>
To: FlorianSchandinat@....de
Cc: linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org, Emil Goode <emilgoode@...il.com>
Subject: [PATCH v2] grvga: Fix error handling issues
This patch fixes two problems with the error handling in the
grvga_probe function and simplifies it making the code
easier to read.
- 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 in the error handling code.
This patch introduces the following changes:
- Converts request_mem_region into its devm_ equivalent
which simplifies the otherwise messy clean up code.
- Changes the labels for correct error handling and their
names to make the code easier to read.
Signed-off-by: Emil Goode <emilgoode@...il.com>
---
v2: Simplifies the error handling by converting to
devm_request_mem_region
drivers/video/grvga.c | 47 ++++++++++++++++++++++-------------------------
1 file changed, 22 insertions(+), 25 deletions(-)
diff --git a/drivers/video/grvga.c b/drivers/video/grvga.c
index da066c2..5245f9a 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);
@@ -387,10 +387,11 @@ static int __devinit grvga_probe(struct platform_device *dev)
info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK | FBINFO_HWACCEL_YPAN;
info->fix.smem_len = grvga_mem_size;
- if (!request_mem_region(dev->resource[0].start, resource_size(&dev->resource[0]), "grlib-svgactrl regs")) {
+ if (!devm_request_mem_region(&dev->dev, 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 +401,14 @@ 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 free_fb;
}
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 +416,7 @@ 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;
}
}
@@ -427,10 +428,11 @@ static int __devinit grvga_probe(struct platform_device *dev)
physical_start = grvga_fix_addr;
- if (!request_mem_region(physical_start, grvga_mem_size, dev->name)) {
+ if (!devm_request_mem_region(&dev->dev, 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 +440,7 @@ 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 dealloc_cmap;
}
} else { /* Allocate frambuffer memory */
@@ -451,7 +453,7 @@ 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 +486,7 @@ 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 +495,18 @@ 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);
+ if (grvga_fix_addr)
iounmap((void *)virtual_start);
- } else
+ 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_mem_region(dev->resource[0].start, resource_size(&dev->resource[0]));
-err:
+free_fb:
framebuffer_release(info);
return retval;
@@ -524,12 +523,10 @@ static int __devexit grvga_remove(struct platform_device *device)
of_iounmap(&device->resource[0], par->regs,
resource_size(&device->resource[0]));
- release_mem_region(device->resource[0].start, resource_size(&device->resource[0]));
- if (!par->fb_alloced) {
- release_mem_region(info->fix.smem_start, info->fix.smem_len);
+ if (!par->fb_alloced)
iounmap(info->screen_base);
- } else
+ else
kfree((void *)info->screen_base);
framebuffer_release(info);
--
1.7.10
--
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