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nvmem: core: Fix device reference leak 

__nvmem_device_get() make use of bus_find_device() to get the relevant
device and this function increase the reference count of the device
found, however this is not accounted for anywhere. Fix
__nvmem_device_get() and __nvmem_device_put() to properly release this
reference count.

Signed-off-by: Alban Bedel <albeu@free.fr>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Alban Bedel 2019-01-28 15:55:05 +00:00 committed by Greg Kroah-Hartman
parent 95b65195d5
commit 73e9dc4d56
1 changed files with 2 additions and 0 deletions
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2
drivers/nvmem/core.c
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@ -811,6 +811,7 @@ static struct nvmem_device *__nvmem_device_get(struct device_node *np,
"could not increase module refcount for cell %s\n",
nvmem_dev_name(nvmem));
put_device(&nvmem->dev);
return ERR_PTR(-EINVAL);
}
@ -821,6 +822,7 @@ static struct nvmem_device *__nvmem_device_get(struct device_node *np,
static void __nvmem_device_put(struct nvmem_device *nvmem)
{
put_device(&nvmem->dev);
module_put(nvmem->owner);
kref_put(&nvmem->refcnt, nvmem_device_release);
}