From: YAN SHI m202071378@hust.edu.cn
[ Upstream commit c4a413e56d16a2ae84e6d8992f215c4dcc7fac20 ]
Smatch reports: drivers/regulator/stm32-pwr.c:166 stm32_pwr_regulator_probe() warn: 'base' from of_iomap() not released on lines: 151,166.
In stm32_pwr_regulator_probe(), base is not released when devm_kzalloc() fails to allocate memory or devm_regulator_register() fails to register a new regulator device, which may cause a leak.
To fix this issue, replace of_iomap() with devm_platform_ioremap_resource(). devm_platform_ioremap_resource() is a specialized function for platform devices. It allows 'base' to be automatically released whether the probe function succeeds or fails.
Besides, use IS_ERR(base) instead of !base as the return value of devm_platform_ioremap_resource() can either be a pointer to the remapped memory or an ERR_PTR() encoded error code if the operation fails.
Fixes: dc62f951a6a8 ("regulator: stm32-pwr: Fix return value check in stm32_pwr_regulator_probe()") Signed-off-by: YAN SHI m202071378@hust.edu.cn Reported-by: kernel test robot lkp@intel.com Link: https://lore.kernel.org/oe-kbuild-all/202304111750.o2643eJN-lkp@intel.com/ Reviewed-by: Dongliang Mu dzm91@hust.edu.cn Link: https://lore.kernel.org/r/20230412033529.18890-1-m202071378@hust.edu.cn Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/regulator/stm32-pwr.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/regulator/stm32-pwr.c b/drivers/regulator/stm32-pwr.c index e0e627b0106e0..b94da49923767 100644 --- a/drivers/regulator/stm32-pwr.c +++ b/drivers/regulator/stm32-pwr.c @@ -129,17 +129,16 @@ static const struct regulator_desc stm32_pwr_desc[] = {
static int stm32_pwr_regulator_probe(struct platform_device *pdev) { - struct device_node *np = pdev->dev.of_node; struct stm32_pwr_reg *priv; void __iomem *base; struct regulator_dev *rdev; struct regulator_config config = { }; int i, ret = 0;
- base = of_iomap(np, 0); - if (!base) { + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) { dev_err(&pdev->dev, "Unable to map IO memory\n"); - return -ENOMEM; + return PTR_ERR(base); }
config.dev = &pdev->dev;