[PATCH 1/4 v3] mtd: onenand: samsung: use devm_ function to simplify code and fix some leaks
Christophe JAILLET
christophe.jaillet at wanadoo.fr
Wed Dec 13 22:03:49 PST 2017
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 at wanadoo.fr>
---
Cross-compiled tested-only
v2: use devm_ioremap_resource()
v3: fix a bug introduced in v2
---
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..b650290611d2 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 +865,12 @@ 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->phys_base = r->start;
- 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 +879,20 @@ 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 +900,9 @@ 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 = 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->dma_addr = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(onenand->dma_addr))
+ return PTR_ERR(onenand->dma_addr);
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;
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;
}
--
2.14.1
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