"Managed Device Resource" or devm_xx calls takes care of automatic freeing
of the resource in case of:
- failure during driver probe
- failure during resource allocation
- detaching or unloading of driver module (rmmod)
Reference: Documentation/driver-model/devres.txt
Though OMAP NAND driver handles freeing of resource allocation in most of
the cases, but using devm_xx provides more clean and effortless approach
to handle all such cases.
- simplifies label for exiting probe during error
s/out_release_mem_region/return_error
Signed-off-by: Pekon Gupta <pekon@xxxxxx>
---
drivers/mtd/nand/omap2.c | 89 ++++++++++++++++++++----------------------------
1 file changed, 37 insertions(+), 52 deletions(-)
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 4f8efe0..45433f4 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1642,7 +1642,8 @@ static int omap_nand_probe(struct platform_device *pdev)
return -ENODEV;
}
- info = kzalloc(sizeof(struct omap_nand_info), GFP_KERNEL);
+ info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info),
+ GFP_KERNEL);
if (!info)
return -ENOMEM;
@@ -1667,22 +1668,23 @@ static int omap_nand_probe(struct platform_device *pdev)
if (res == NULL) {
err = -EINVAL;
dev_err(&pdev->dev, "error getting memory resource\n");
- goto out_free_info;
+ goto return_error;
}
info->phys_base = res->start;
info->mem_size = resource_size(res);
- if (!request_mem_region(info->phys_base, info->mem_size,
- pdev->dev.driver->name)) {
+ if (!devm_request_mem_region(&pdev->dev, info->phys_base,
+ info->mem_size, pdev->dev.driver->name)) {
err = -EBUSY;
- goto out_free_info;
+ goto return_error;
}
- nand_chip->IO_ADDR_R = ioremap(info->phys_base, info->mem_size);
+ nand_chip->IO_ADDR_R = devm_ioremap(&pdev->dev, info->phys_base,
+ info->mem_size);
if (!nand_chip->IO_ADDR_R) {
err = -ENOMEM;
- goto out_release_mem_region;
+ goto return_error;
}
nand_chip->controller = &info->controller;
@@ -1718,13 +1720,13 @@ static int omap_nand_probe(struct platform_device *pdev)
nand_chip->options |= pdata->devsize;
if (nand_scan_ident(mtd, 1, NULL)) {
err = -ENXIO;
- goto out_release_mem_region;
+ goto return_error;
}
} else {
/* some genuine failure, because even platform-data
* (DT binding) says that bus-width is x8 */
err = -ENXIO;
- goto out_release_mem_region;
+ goto return_error;
}
} else {
/* nand_scan_ident passed with x8 mode */
@@ -1733,7 +1735,7 @@ static int omap_nand_probe(struct platform_device *pdev)
pr_err("%s: incorrect bus-width config\n", DRIVER_NAME);
err = -EINVAL;
err = -ENXIO;
- goto out_release_mem_region;
+ goto return_error;
}
}
@@ -1741,7 +1743,7 @@ static int omap_nand_probe(struct platform_device *pdev)
if ((mtd->oobsize < 64) && (pdata->ecc_opt != OMAP_ECC_HAM1_CODE_HW)) {
pr_err("small page devices are not supported\n");
err = -EINVAL;
- goto out_release_mem_region;
+ goto return_error;
}
/* re-populate low-level callbacks based on xfer modes */
@@ -1769,7 +1771,7 @@ static int omap_nand_probe(struct platform_device *pdev)
if (!info->dma) {
dev_err(&pdev->dev, "DMA engine request failed\n");
err = -ENXIO;
- goto out_release_mem_region;
+ goto return_error;
} else {
struct dma_slave_config cfg;
@@ -1784,7 +1786,7 @@ static int omap_nand_probe(struct platform_device *pdev)
if (err) {
dev_err(&pdev->dev, "DMA engine slave config failed: %d\n",
err);
- goto out_release_mem_region;
+ goto return_error;
}
nand_chip->read_buf = omap_read_buf_dma_pref;
nand_chip->write_buf = omap_write_buf_dma_pref;
@@ -1796,30 +1798,32 @@ static int omap_nand_probe(struct platform_device *pdev)
if (info->gpmc_irq_fifo <= 0) {
dev_err(&pdev->dev, "error getting fifo irq\n");
err = -ENODEV;
- goto out_release_mem_region;
+ goto return_error;
}
- err = request_irq(info->gpmc_irq_fifo, omap_nand_irq,
- IRQF_SHARED, "gpmc-nand-fifo", info);
+ err = devm_request_irq(&pdev->dev, info->gpmc_irq_fifo,
+ omap_nand_irq, IRQF_SHARED,
+ "gpmc-nand-fifo", info);
if (err) {
dev_err(&pdev->dev, "requesting irq(%d) error:%d",
info->gpmc_irq_fifo, err);
info->gpmc_irq_fifo = 0;
- goto out_release_mem_region;
+ goto return_error;
}
info->gpmc_irq_count = platform_get_irq(pdev, 1);
if (info->gpmc_irq_count <= 0) {
dev_err(&pdev->dev, "error getting count irq\n");
err = -ENODEV;
- goto out_release_mem_region;
+ goto return_error;
}
- err = request_irq(info->gpmc_irq_count, omap_nand_irq,
- IRQF_SHARED, "gpmc-nand-count", info);
+ err = devm_request_irq(&pdev->dev, info->gpmc_irq_count,
+ omap_nand_irq, IRQF_SHARED,
+ "gpmc-nand-count", info);
if (err) {
dev_err(&pdev->dev, "requesting irq(%d) error:%d",
info->gpmc_irq_count, err);
info->gpmc_irq_count = 0;
- goto out_release_mem_region;
+ goto return_error;
}
nand_chip->read_buf = omap_read_buf_irq_pref;
@@ -1831,7 +1835,7 @@ static int omap_nand_probe(struct platform_device *pdev)
dev_err(&pdev->dev,
"xfer_type(%d) not supported!\n", pdata->xfer_type);
err = -EINVAL;
- goto out_release_mem_region;
+ goto return_error;
}
/* populate MTD interface based on ECC scheme */
@@ -1889,7 +1893,7 @@ static int omap_nand_probe(struct platform_device *pdev)
#else
pr_err("nand: error: CONFIG_MTD_NAND_ECC_BCH not enabled\n");
err = -EINVAL;
- goto out_release_mem_region;
+ goto return_error;
#endif
case OMAP_ECC_BCH4_CODE_HW:
@@ -1916,13 +1920,13 @@ static int omap_nand_probe(struct platform_device *pdev)
if (is_elm_present(info, pdata->elm_of_node, BCH4_ECC) < 0) {
pr_err("nand: error: could not initialize ELM\n");
err = -ENODEV;
- goto out_release_mem_region;
+ goto return_error;
}
break;
#else
pr_err("nand: error: CONFIG_MTD_NAND_OMAP_BCH not enabled\n");
err = -EINVAL;
- goto out_release_mem_region;
+ goto return_error;
#endif
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
@@ -1950,13 +1954,13 @@ static int omap_nand_probe(struct platform_device *pdev)
if (!nand_chip->ecc.priv) {
pr_err("nand: error: unable to use s/w BCH library\n");
err = -EINVAL;
- goto out_release_mem_region;
+ goto return_error;
}
break;
#else
pr_err("nand: error: CONFIG_MTD_NAND_ECC_BCH not enabled\n");
err = -EINVAL;
- goto out_release_mem_region;
+ goto return_error;
#endif
case OMAP_ECC_BCH8_CODE_HW:
@@ -1975,7 +1979,7 @@ static int omap_nand_probe(struct platform_device *pdev)
/* This ECC scheme requires ELM H/W block */
if (is_elm_present(info, pdata->elm_of_node, BCH8_ECC) < 0) {
pr_err("nand: error: could not initialize ELM\n");
- goto out_release_mem_region;
+ goto return_error;
}
/* define ECC layout */
ecclayout->eccbytes = nand_chip->ecc.bytes *
@@ -1988,13 +1992,13 @@ static int omap_nand_probe(struct platform_device *pdev)
#else
pr_err("nand: error: CONFIG_MTD_NAND_OMAP_BCH not enabled\n");
err = -EINVAL;
- goto out_release_mem_region;
+ goto return_error;
#endif
default:
pr_err("nand: error: invalid or unsupported ECC scheme\n");
err = -EINVAL;
- goto out_release_mem_region;
+ goto return_error;
}
/* populate remaining ECC layout data */
@@ -2007,13 +2011,13 @@ static int omap_nand_probe(struct platform_device *pdev)
pr_err("not enough OOB bytes required = %d, available=%d\n",
ecclayout->eccbytes, mtd->oobsize);
err = -EINVAL;
- goto out_release_mem_region;
+ goto return_error;
}
/* second phase scan */
if (nand_scan_tail(mtd)) {
err = -ENXIO;
- goto out_release_mem_region;
+ goto return_error;
}
ppdata.of_node = pdata->of_node;
@@ -2024,21 +2028,13 @@ static int omap_nand_probe(struct platform_device *pdev)
return 0;
-out_release_mem_region:
+return_error:
if (info->dma)
dma_release_channel(info->dma);
- if (info->gpmc_irq_count > 0)
- free_irq(info->gpmc_irq_count, info);
- if (info->gpmc_irq_fifo > 0)
- free_irq(info->gpmc_irq_fifo, info);
- release_mem_region(info->phys_base, info->mem_size);
-out_free_info:
if (nand_chip->ecc.priv) {
nand_bch_free(nand_chip->ecc.priv);
nand_chip->ecc.priv = NULL;
}
- kfree(info);
-
return err;
}
@@ -2052,20 +2048,9 @@ static int omap_nand_remove(struct platform_device *pdev)
nand_bch_free(nand_chip->ecc.priv);
nand_chip->ecc.priv = NULL;
}
-
if (info->dma)
dma_release_channel(info->dma);
-
- if (info->gpmc_irq_count > 0)
- free_irq(info->gpmc_irq_count, info);
- if (info->gpmc_irq_fifo > 0)
- free_irq(info->gpmc_irq_fifo, info);
-
- /* Release NAND device, its internal structures and partitions */
nand_release(mtd);
- iounmap(nand_chip->IO_ADDR_R);
- release_mem_region(info->phys_base, info->mem_size);
- kfree(info);
return 0;
}
--
1.8.1
--
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