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Date: Sat, 21 Jan 2012 16:01:58 +0100 (CET)
From: Julia Lawall <julia.lawall@...6.fr>
To: Manuel Lauss <manuel.lauss@...glemail.com>
cc: Florian Tobias Schandinat <FlorianSchandinat@....de>,
Julia Lawall <Julia.Lawall@...6.fr>,
kernel-janitors@...r.kernel.org, linux-fbdev@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] drivers/video/au*fb.c: use devm_ functions
The various devm_ functions allocate memory that is released when a driver
detaches. This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.
In au1100fb.c, the probe function now returns -ENODEV on failure.
Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
---
In the case of au1200fb.c, should the error-handling code under the new
call to dma_alloc_noncoherent jump to failed, like the other error handling
code? I was not sure that there was actually anything for failed to do at
this point in the function.
Added return of -ENODEV.
drivers/video/au1100fb.c | 32 ++++++++++++--------------------
drivers/video/au1200fb.c | 9 +--------
2 files changed, 13 insertions(+), 28 deletions(-)
diff --git a/drivers/video/au1200fb.c b/drivers/video/au1200fb.c
index 04e4479..3e9a773 100644
--- a/drivers/video/au1200fb.c
+++ b/drivers/video/au1200fb.c
@@ -1724,7 +1724,7 @@ static int __devinit au1200fb_drv_probe(struct platform_device *dev)
/* Allocate the framebuffer to the maximum screen size */
fbdev->fb_len = (win->w[plane].xres * win->w[plane].yres * bpp) / 8;
- fbdev->fb_mem = dma_alloc_noncoherent(&dev->dev,
+ fbdev->fb_mem = dmam_alloc_noncoherent(&dev->dev, &dev->dev,
PAGE_ALIGN(fbdev->fb_len),
&fbdev->fb_phys, GFP_KERNEL);
if (!fbdev->fb_mem) {
@@ -1788,9 +1788,6 @@ static int __devinit au1200fb_drv_probe(struct platform_device *dev)
failed:
/* NOTE: This only does the current plane/window that failed; others are still active */
- if (fbdev->fb_mem)
- dma_free_noncoherent(&dev->dev, PAGE_ALIGN(fbdev->fb_len),
- fbdev->fb_mem, fbdev->fb_phys);
if (fbi) {
if (fbi->cmap.len != 0)
fb_dealloc_cmap(&fbi->cmap);
@@ -1817,10 +1814,6 @@ static int __devexit au1200fb_drv_remove(struct platform_device *dev)
/* Clean up all probe data */
unregister_framebuffer(fbi);
- if (fbdev->fb_mem)
- dma_free_noncoherent(&dev->dev,
- PAGE_ALIGN(fbdev->fb_len),
- fbdev->fb_mem, fbdev->fb_phys);
if (fbi->cmap.len != 0)
fb_dealloc_cmap(&fbi->cmap);
kfree(fbi->pseudo_palette);
diff --git a/drivers/video/au1100fb.c b/drivers/video/au1100fb.c
index de9da67..befcbd8 100644
--- a/drivers/video/au1100fb.c
+++ b/drivers/video/au1100fb.c
@@ -477,7 +477,8 @@ static int __devinit au1100fb_drv_probe(struct platform_device *dev)
u32 sys_clksrc;
/* Allocate new device private */
- fbdev = kzalloc(sizeof(struct au1100fb_device), GFP_KERNEL);
+ fbdev = devm_kzalloc(&dev->dev, sizeof(struct au1100fb_device),
+ GFP_KERNEL);
if (!fbdev) {
print_err("fail to allocate device private record");
return -ENOMEM;
@@ -498,8 +499,9 @@ static int __devinit au1100fb_drv_probe(struct platform_device *dev)
au1100fb_fix.mmio_start = regs_res->start;
au1100fb_fix.mmio_len = resource_size(regs_res);
- if (!request_mem_region(au1100fb_fix.mmio_start, au1100fb_fix.mmio_len,
- DRIVER_NAME)) {
+ if (!devm_request_mem_region(au1100fb_fix.mmio_start,
+ au1100fb_fix.mmio_len,
+ DRIVER_NAME)) {
print_err("fail to lock memory region at 0x%08lx",
au1100fb_fix.mmio_start);
return -EBUSY;
@@ -514,8 +516,9 @@ static int __devinit au1100fb_drv_probe(struct platform_device *dev)
fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *
(fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;
- fbdev->fb_mem = dma_alloc_coherent(&dev->dev, PAGE_ALIGN(fbdev->fb_len),
- &fbdev->fb_phys, GFP_KERNEL);
+ fbdev->fb_mem = dmam_alloc_coherent(&dev->dev, &dev->dev,
+ PAGE_ALIGN(fbdev->fb_len),
+ &fbdev->fb_phys, GFP_KERNEL);
if (!fbdev->fb_mem) {
print_err("fail to allocate frambuffer (size: %dK))",
fbdev->fb_len / 1024);
@@ -557,14 +560,14 @@ static int __devinit au1100fb_drv_probe(struct platform_device *dev)
fbdev->info.fbops = &au1100fb_ops;
fbdev->info.fix = au1100fb_fix;
- if (!(fbdev->info.pseudo_palette = kzalloc(sizeof(u32) * 16, GFP_KERNEL))) {
+ fbdev->info.pseudo_palette =
+ devm_kzalloc(&dev->dev, sizeof(u32) * 16, GFP_KERNEL);
+ if (!fbdev->info.pseudo_palette)
return -ENOMEM;
- }
if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
print_err("Fail to allocate colormap (%d entries)",
AU1100_LCD_NBR_PALETTE_ENTRIES);
- kfree(fbdev->info.pseudo_palette);
return -EFAULT;
}
@@ -582,9 +585,6 @@ static int __devinit au1100fb_drv_probe(struct platform_device *dev)
return 0;
failed:
- if (fbdev->regs) {
- release_mem_region(fbdev->regs_phys, fbdev->regs_len);
- }
if (fbdev->fb_mem) {
dma_free_noncoherent(&dev->dev, fbdev->fb_len, fbdev->fb_mem,
fbdev->fb_phys);
@@ -592,10 +592,9 @@ failed:
if (fbdev->info.cmap.len != 0) {
fb_dealloc_cmap(&fbdev->info.cmap);
}
- kfree(fbdev);
platform_set_drvdata(dev, NULL);
- return 0;
+ return -ENODEV;
}
int au1100fb_drv_remove(struct platform_device *dev)
@@ -615,14 +614,7 @@ int au1100fb_drv_remove(struct platform_device *dev)
/* Clean up all probe data */
unregister_framebuffer(&fbdev->info);
- release_mem_region(fbdev->regs_phys, fbdev->regs_len);
-
- dma_free_coherent(&dev->dev, PAGE_ALIGN(fbdev->fb_len), fbdev->fb_mem,
- fbdev->fb_phys);
-
fb_dealloc_cmap(&fbdev->info.cmap);
- kfree(fbdev->info.pseudo_palette);
- kfree((void*)fbdev);
return 0;
}
--
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