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Date: Mon, 30 Jan 2012 05:17:06 +0000
From: Florian Tobias Schandinat <FlorianSchandinat@....de>
To: Julia Lawall <julia.lawall@...6.fr>
CC: Manuel Lauss <manuel.lauss@...glemail.com>,
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
On 01/21/2012 03:01 PM, Julia Lawall wrote:
> 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>
Applied.
Thanks,
Florian Tobias Schandinat
>
> ---
> 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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