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Date: Sat, 9 Dec 2017 09:33:37 +0100
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: kyungmin.park@...sung.com, dwmw2@...radead.org,
computersforpeace@...il.com, marek.vasut@...il.com, richard@....at,
cyrille.pitchen@...ev4u.fr, linux-mtd@...ts.infradead.org,
linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/2 v2] mtd: onenand: samsung: use devm_ function to
simplify code and fix some leaks
On Sat, 9 Dec 2017 08:24:04 +0100
Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:
> Convert all error handling code in 's3c_onenand_probe()' to
> resource-managed alternatives in order to simplify code.
>
> This fixes a resource leak if 'platform_get_resource()' fails at line 872.
>
> The 'request_irq()' at line 971 was also un-balanced. It is now
> resource-managed.
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Compile tested-only
>
> v2: use devm_ioremap_resource()
> ---
> drivers/mtd/onenand/samsung.c | 164 ++++++++----------------------------------
> 1 file changed, 29 insertions(+), 135 deletions(-)
>
> diff --git a/drivers/mtd/onenand/samsung.c b/drivers/mtd/onenand/samsung.c
> index af0ac1a7bf8f..2e562c224060 100644
> --- a/drivers/mtd/onenand/samsung.c
> +++ b/drivers/mtd/onenand/samsung.c
> @@ -129,16 +129,13 @@ struct s3c_onenand {
> struct platform_device *pdev;
> enum soc_type type;
> void __iomem *base;
> - struct resource *base_res;
> void __iomem *ahb_addr;
> - struct resource *ahb_res;
> int bootram_command;
> void __iomem *page_buf;
> void __iomem *oob_buf;
> unsigned int (*mem_addr)(int fba, int fpa, int fsa);
> unsigned int (*cmd_map)(unsigned int type, unsigned int val);
> void __iomem *dma_addr;
> - struct resource *dma_res;
> unsigned long phys_base;
> struct completion complete;
> };
> @@ -851,15 +848,13 @@ static int s3c_onenand_probe(struct platform_device *pdev)
> /* No need to check pdata. the platform data is optional */
>
> size = sizeof(struct mtd_info) + sizeof(struct onenand_chip);
> - mtd = kzalloc(size, GFP_KERNEL);
> + mtd = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
> if (!mtd)
> return -ENOMEM;
>
> - onenand = kzalloc(sizeof(struct s3c_onenand), GFP_KERNEL);
> - if (!onenand) {
> - err = -ENOMEM;
> - goto onenand_fail;
> - }
> + onenand = devm_kzalloc(&pdev->dev, sizeof(struct s3c_onenand), GFP_KERNEL);
> + if (!onenand)
> + return -ENOMEM;
>
> this = (struct onenand_chip *) &mtd[1];
> mtd->priv = this;
> @@ -870,26 +865,10 @@ static int s3c_onenand_probe(struct platform_device *pdev)
> s3c_onenand_setup(mtd);
>
> r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - if (!r) {
> - dev_err(&pdev->dev, "no memory resource defined\n");
> - return -ENOENT;
> - goto ahb_resource_failed;
> - }
> + onenand->base = devm_ioremap_resource(&pdev->dev, r);
> + if (IS_ERR(onenand->base))
> + return PTR_ERR(onenand->base);
>
> - onenand->base_res = request_mem_region(r->start, resource_size(r),
> - pdev->name);
> - if (!onenand->base_res) {
> - dev_err(&pdev->dev, "failed to request memory resource\n");
> - err = -EBUSY;
> - goto resource_failed;
> - }
> -
> - onenand->base = ioremap(r->start, resource_size(r));
> - if (!onenand->base) {
> - dev_err(&pdev->dev, "failed to map memory resource\n");
> - err = -EFAULT;
> - goto ioremap_failed;
> - }
> /* Set onenand_chip also */
> this->base = onenand->base;
>
> @@ -898,40 +877,20 @@ static int s3c_onenand_probe(struct platform_device *pdev)
>
> if (onenand->type != TYPE_S5PC110) {
> r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> - if (!r) {
> - dev_err(&pdev->dev, "no buffer memory resource defined\n");
> - err = -ENOENT;
> - goto ahb_resource_failed;
> - }
> -
> - onenand->ahb_res = request_mem_region(r->start, resource_size(r),
> - pdev->name);
> - if (!onenand->ahb_res) {
> - dev_err(&pdev->dev, "failed to request buffer memory resource\n");
> - err = -EBUSY;
> - goto ahb_resource_failed;
> - }
> -
> - onenand->ahb_addr = ioremap(r->start, resource_size(r));
> - if (!onenand->ahb_addr) {
> - dev_err(&pdev->dev, "failed to map buffer memory resource\n");
> - err = -EINVAL;
> - goto ahb_ioremap_failed;
> - }
> + onenand->ahb_addr = devm_ioremap_resource(&pdev->dev, r);
> + if (IS_ERR(onenand->ahb_addr))
> + return PTR_ERR(onenand->ahb_addr);
>
> /* Allocate 4KiB BufferRAM */
> - onenand->page_buf = kzalloc(SZ_4K, GFP_KERNEL);
> - if (!onenand->page_buf) {
> - err = -ENOMEM;
> - goto page_buf_fail;
> - }
> + onenand->page_buf = devm_kzalloc(&pdev->dev, SZ_4K,
> + GFP_KERNEL);
> + if (!onenand->page_buf)
> + return -ENOMEM;
>
> /* Allocate 128 SpareRAM */
> - onenand->oob_buf = kzalloc(128, GFP_KERNEL);
> - if (!onenand->oob_buf) {
> - err = -ENOMEM;
> - goto oob_buf_fail;
> - }
> + onenand->oob_buf = devm_kzalloc(&pdev->dev, 128, GFP_KERNEL);
> + if (!onenand->oob_buf)
> + return -ENOMEM;
>
> /* S3C doesn't handle subpage write */
> mtd->subpage_sft = 0;
> @@ -939,28 +898,11 @@ static int s3c_onenand_probe(struct platform_device *pdev)
>
> } else { /* S5PC110 */
> r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> - if (!r) {
> - dev_err(&pdev->dev, "no dma memory resource defined\n");
> - err = -ENOENT;
> - goto dma_resource_failed;
> - }
> -
> - onenand->dma_res = request_mem_region(r->start, resource_size(r),
> - pdev->name);
> - if (!onenand->dma_res) {
> - dev_err(&pdev->dev, "failed to request dma memory resource\n");
> - err = -EBUSY;
> - goto dma_resource_failed;
> - }
> + onenand->dma_addr = devm_ioremap_resource(&pdev->dev, r);
> + if (IS_ERR(onenand->dma_addr))
> + return PTR_ERR(onenand->dma_addr);
>
> - onenand->dma_addr = ioremap(r->start, resource_size(r));
> - if (!onenand->dma_addr) {
> - dev_err(&pdev->dev, "failed to map dma memory resource\n");
> - err = -EINVAL;
> - goto dma_ioremap_failed;
> - }
> -
> - onenand->phys_base = onenand->base_res->start;
> + onenand->phys_base = r->start;
This is wrong, ->phys_base should be assigned to base_res->start not
dma_res->start (I pointed it in my previous review).
>
> s5pc110_dma_ops = s5pc110_dma_poll;
> /* Interrupt support */
> @@ -968,19 +910,19 @@ static int s3c_onenand_probe(struct platform_device *pdev)
> if (r) {
> init_completion(&onenand->complete);
> s5pc110_dma_ops = s5pc110_dma_irq;
> - err = request_irq(r->start, s5pc110_onenand_irq,
> - IRQF_SHARED, "onenand", &onenand);
> + err = devm_request_irq(&pdev->dev, r->start,
> + s5pc110_onenand_irq,
> + IRQF_SHARED, "onenand",
> + &onenand);
> if (err) {
> dev_err(&pdev->dev, "failed to get irq\n");
> - goto scan_failed;
> + return err;
> }
> }
> }
>
> - if (onenand_scan(mtd, 1)) {
> - err = -EFAULT;
> - goto scan_failed;
> - }
> + if (onenand_scan(mtd, 1))
> + return -EFAULT;
Not related to this patch, but we should return the error code returned
by onenand_scan() here instead of always returning -EFAULT.
>
> if (onenand->type != TYPE_S5PC110) {
> /* S3C doesn't handle subpage write */
> @@ -998,36 +940,6 @@ static int s3c_onenand_probe(struct platform_device *pdev)
> platform_set_drvdata(pdev, mtd);
>
> return 0;
> -
> -scan_failed:
> - if (onenand->dma_addr)
> - iounmap(onenand->dma_addr);
> -dma_ioremap_failed:
> - if (onenand->dma_res)
> - release_mem_region(onenand->dma_res->start,
> - resource_size(onenand->dma_res));
> - kfree(onenand->oob_buf);
> -oob_buf_fail:
> - kfree(onenand->page_buf);
> -page_buf_fail:
> - if (onenand->ahb_addr)
> - iounmap(onenand->ahb_addr);
> -ahb_ioremap_failed:
> - if (onenand->ahb_res)
> - release_mem_region(onenand->ahb_res->start,
> - resource_size(onenand->ahb_res));
> -dma_resource_failed:
> -ahb_resource_failed:
> - iounmap(onenand->base);
> -ioremap_failed:
> - if (onenand->base_res)
> - release_mem_region(onenand->base_res->start,
> - resource_size(onenand->base_res));
> -resource_failed:
> - kfree(onenand);
> -onenand_fail:
> - kfree(mtd);
> - return err;
> }
>
> static int s3c_onenand_remove(struct platform_device *pdev)
> @@ -1035,25 +947,7 @@ static int s3c_onenand_remove(struct platform_device *pdev)
> struct mtd_info *mtd = platform_get_drvdata(pdev);
>
> onenand_release(mtd);
> - if (onenand->ahb_addr)
> - iounmap(onenand->ahb_addr);
> - if (onenand->ahb_res)
> - release_mem_region(onenand->ahb_res->start,
> - resource_size(onenand->ahb_res));
> - if (onenand->dma_addr)
> - iounmap(onenand->dma_addr);
> - if (onenand->dma_res)
> - release_mem_region(onenand->dma_res->start,
> - resource_size(onenand->dma_res));
> -
> - iounmap(onenand->base);
> - release_mem_region(onenand->base_res->start,
> - resource_size(onenand->base_res));
> -
> - kfree(onenand->oob_buf);
> - kfree(onenand->page_buf);
> - kfree(onenand);
> - kfree(mtd);
> +
> return 0;
> }
>
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