2020-10-30 04:13:19

by Bhaumik Bhatt

Subject: [PATCH v3 09/12] bus: mhi: core: Check for IRQ availability during registration

Current design allows a controller to register with MHI successfully
without the need to have any IRQs available for use. If no IRQs are
available, power up requests to MHI can fail after a successful
registration with MHI. Improve the design by checking for the number
of IRQs available sooner within the mhi_regsiter_controller() API as
it is required to be specified by the controller.

Signed-off-by: Bhaumik Bhatt <[email protected]>
---
drivers/bus/mhi/core/init.c | 2 +-
drivers/bus/mhi/core/pm.c | 3 ---
2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 23b6dd6..5dd9e39 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -858,7 +858,7 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,

if (!mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
!mhi_cntrl->status_cb || !mhi_cntrl->read_reg ||
- !mhi_cntrl->write_reg)
+ !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs)
return -EINVAL;

ret = parse_config(mhi_cntrl, config);
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 06adea2..1d04e401 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -926,9 +926,6 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)

dev_info(dev, "Requested to power ON\n");

- if (mhi_cntrl->nr_irqs < 1)
- return -EINVAL;
-
/* Supply default wake routines if not provided by controller driver */
if (!mhi_cntrl->wake_get || !mhi_cntrl->wake_put ||
!mhi_cntrl->wake_toggle) {
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

2020-10-30 14:07:01

by Manivannan Sadhasivam

Subject: Re: [PATCH v3 09/12] bus: mhi: core: Check for IRQ availability during registration

On Thu, Oct 29, 2020 at 09:10:54PM -0700, Bhaumik Bhatt wrote:
> Current design allows a controller to register with MHI successfully
> without the need to have any IRQs available for use. If no IRQs are
> available, power up requests to MHI can fail after a successful
> registration with MHI. Improve the design by checking for the number
> of IRQs available sooner within the mhi_regsiter_controller() API as
> it is required to be specified by the controller.
>
> Signed-off-by: Bhaumik Bhatt <[email protected]>

Reviewed-by: Manivannan Sadhasivam <[email protected]>

Thanks,
Mani

> ---
> drivers/bus/mhi/core/init.c | 2 +-
> drivers/bus/mhi/core/pm.c | 3 ---
> 2 files changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index 23b6dd6..5dd9e39 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -858,7 +858,7 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
>
> if (!mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
> !mhi_cntrl->status_cb || !mhi_cntrl->read_reg ||
> - !mhi_cntrl->write_reg)
> + !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs)
> return -EINVAL;
>
> ret = parse_config(mhi_cntrl, config);
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 06adea2..1d04e401 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -926,9 +926,6 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
>
> dev_info(dev, "Requested to power ON\n");
>
> - if (mhi_cntrl->nr_irqs < 1)
> - return -EINVAL;
> -
> /* Supply default wake routines if not provided by controller driver */
> if (!mhi_cntrl->wake_get || !mhi_cntrl->wake_put ||
> !mhi_cntrl->wake_toggle) {
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>