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bus: mhi: core: Introduce APIs to allocate and free the MHI controller

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Client devices should use the APIs provided to allocate and free
the MHI controller structure. This will help ensure that the
structure is zero-initialized and there are no false positives
with respect to reading any values such as the serial number or
the OEM PK hash.

Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200929175218.8178-11-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bhaumik Bhatt 2020-09-29 23:22:09 +05:30 committed by Greg Kroah-Hartman
parent 8e3729bfa7
commit f42dfbe8f7
2 changed files with 28 additions and 0 deletions
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16
drivers/bus/mhi/core/init.c
View File

@ -954,6 +954,22 @@ void mhi_unregister_controller(struct mhi_controller *mhi_cntrl)
}
EXPORT_SYMBOL_GPL(mhi_unregister_controller);
struct mhi_controller *mhi_alloc_controller(void)
{
struct mhi_controller *mhi_cntrl;
mhi_cntrl = kzalloc(sizeof(*mhi_cntrl), GFP_KERNEL);
return mhi_cntrl;
}
EXPORT_SYMBOL_GPL(mhi_alloc_controller);
void mhi_free_controller(struct mhi_controller *mhi_cntrl)
{
kfree(mhi_cntrl);
}
EXPORT_SYMBOL_GPL(mhi_free_controller);
int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
{
struct device *dev = &mhi_cntrl->mhi_dev->dev;

12
include/linux/mhi.h
View File

@ -527,6 +527,18 @@ struct mhi_driver {
#define to_mhi_driver(drv) container_of(drv, struct mhi_driver, driver)
#define to_mhi_device(dev) container_of(dev, struct mhi_device, dev)
/**
* mhi_alloc_controller - Allocate the MHI Controller structure
* Allocate the mhi_controller structure using zero initialized memory
*/
struct mhi_controller *mhi_alloc_controller(void);
/**
* mhi_free_controller - Free the MHI Controller structure
* Free the mhi_controller structure which was previously allocated
*/
void mhi_free_controller(struct mhi_controller *mhi_cntrl);
/**
* mhi_register_controller - Register MHI controller
* @mhi_cntrl: MHI controller to register