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authorSimon Baatz2017-03-27 20:02:07 +0200
committerBoris Brezillon2017-03-29 17:05:34 +0200
commit675b11d94ce9baa5eb365a51b35d2793f77c8ab8 (patch)
tree0d880e4b1591a333d4c923bc3c2dd7b63a4be891 /drivers/mtd
parente713ddd87ccee801be1fd13f478407b1bde93c21 (diff)
mtd: nand: orion: fix clk handling
The clk handling in orion_nand.c had two problems: - In the probe function, clk_put() was called for an enabled clock, which violates the API (see documentation for clk_put() in include/linux/clk.h) - In the error path of the probe function, clk_put() could be called twice for the same clock. In order to clean this up, use the managed function devm_clk_get() and store the pointer to the clk in the driver data. Fixes: baffab28b13120694fa3ebab08d3e99667a851d2 ('ARM: Orion: fix driver probe error handling with respect to clk') Cc: <stable@vger.kernel.org> # v4.5+ Signed-off-by: Simon Baatz <gmbnomis@gmail.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/orion_nand.c42
1 files changed, 21 insertions, 21 deletions
diff --git a/drivers/mtd/nand/orion_nand.c b/drivers/mtd/nand/orion_nand.c
index 4a91c5d000be..3acdc20485f1 100644
--- a/drivers/mtd/nand/orion_nand.c
+++ b/drivers/mtd/nand/orion_nand.c
@@ -23,6 +23,11 @@
#include <asm/sizes.h>
#include <linux/platform_data/mtd-orion_nand.h>
+struct orion_nand_info {
+ struct nand_chip chip;
+ struct clk *clk;
+};
+
static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *nc = mtd_to_nand(mtd);
@@ -75,20 +80,21 @@ static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
static int __init orion_nand_probe(struct platform_device *pdev)
{
+ struct orion_nand_info *info;
struct mtd_info *mtd;
struct nand_chip *nc;
struct orion_nand_data *board;
struct resource *res;
- struct clk *clk;
void __iomem *io_base;
int ret = 0;
u32 val = 0;
- nc = devm_kzalloc(&pdev->dev,
- sizeof(struct nand_chip),
+ info = devm_kzalloc(&pdev->dev,
+ sizeof(struct orion_nand_info),
GFP_KERNEL);
- if (!nc)
+ if (!info)
return -ENOMEM;
+ nc = &info->chip;
mtd = nand_to_mtd(nc);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -145,15 +151,13 @@ static int __init orion_nand_probe(struct platform_device *pdev)
if (board->dev_ready)
nc->dev_ready = board->dev_ready;
- platform_set_drvdata(pdev, mtd);
+ platform_set_drvdata(pdev, info);
/* Not all platforms can gate the clock, so it is not
an error if the clock does not exists. */
- clk = clk_get(&pdev->dev, NULL);
- if (!IS_ERR(clk)) {
- clk_prepare_enable(clk);
- clk_put(clk);
- }
+ info->clk = devm_clk_get(&pdev->dev, NULL);
+ if (!IS_ERR(info->clk))
+ clk_prepare_enable(info->clk);
ret = nand_scan(mtd, 1);
if (ret)
@@ -169,26 +173,22 @@ static int __init orion_nand_probe(struct platform_device *pdev)
return 0;
no_dev:
- if (!IS_ERR(clk)) {
- clk_disable_unprepare(clk);
- clk_put(clk);
- }
+ if (!IS_ERR(info->clk))
+ clk_disable_unprepare(info->clk);
return ret;
}
static int orion_nand_remove(struct platform_device *pdev)
{
- struct mtd_info *mtd = platform_get_drvdata(pdev);
- struct clk *clk;
+ struct orion_nand_info *info = platform_get_drvdata(pdev);
+ struct nand_chip *chip = &info->chip;
+ struct mtd_info *mtd = nand_to_mtd(chip);
nand_release(mtd);
- clk = clk_get(&pdev->dev, NULL);
- if (!IS_ERR(clk)) {
- clk_disable_unprepare(clk);
- clk_put(clk);
- }
+ if (!IS_ERR(info->clk))
+ clk_disable_unprepare(info->clk);
return 0;
}