[v3] bus: mhi: make mhi_controller_config::event_cfg const

Currently the event_cfg pointer in struct mhi_controller_config is not
defined as a const pointer. This prevents clients from registering a
read-only configuration unless they use a typecast. Since the
event_cfg should not be modified once registered, add the const
qualifier to event_cfg. This is aligned with the definition of ch_cfg.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
---
 drivers/bus/mhi/host/pci_generic.c | 14 +++++++-------
 include/linux/mhi.h                |  2 +-
 2 files changed, 8 insertions(+), 8 deletions(-)

On 8/19/2022 2:15 PM, Jeff Johnson wrote:
> On 8/19/2022 2:08 PM, Jeffrey Hugo wrote:
>> On 8/19/2022 3:02 PM, Jeff Johnson wrote:
>>> Currently the event_cfg pointer in struct mhi_controller_config is not
>>> defined as a const pointer. This prevents clients from registering a
>>> read-only configuration unless they use a typecast. Since the
>>> event_cfg should not be modified once registered, add the const
>>> qualifier to event_cfg. This is aligned with the definition of ch_cfg.
>>>
>>> Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
>>> ---
>>
>> v3 and no changelog?
> 
> Rookie mistake :)
> v1: only header file changed
> v2: added SOB
> v3: added pci_generic.c change

I see my patch has been set to Not Applicable in patchwork, but did not 
receive any comments other than the one quoted here.

Should I rebase & post v4 with a correct changelog?

On Fri, Aug 19, 2022 at 02:02:30PM -0700, Jeff Johnson wrote:

Subject prefix should include "host" as we now have both host and ep MHI
stacks. Like,

bus: mhi: host: make mhi_controller_config::event_cfg const

> Currently the event_cfg pointer in struct mhi_controller_config is not
> defined as a const pointer. This prevents clients from registering a
> read-only configuration unless they use a typecast. Since the
> event_cfg should not be modified once registered, add the const
> qualifier to event_cfg. This is aligned with the definition of ch_cfg.
> 

I don't know how it got missed as it should've been made constant in the
initial implementation itself :/

> Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
> ---
>  drivers/bus/mhi/host/pci_generic.c | 14 +++++++-------
>  include/linux/mhi.h                |  2 +-
>  2 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> index 841626727f6b..2470e9f82aeb 100644
> --- a/drivers/bus/mhi/host/pci_generic.c
> +++ b/drivers/bus/mhi/host/pci_generic.c
> @@ -238,7 +238,7 @@ static const struct mhi_channel_config modem_qcom_v1_mhi_channels[] = {
>  	MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0", 128, 3),
>  };
>  
> -static struct mhi_event_config modem_qcom_v1_mhi_events[] = {
> +static const struct mhi_event_config modem_qcom_v1_mhi_events[] = {
>  	/* first ring is control+data ring */
>  	MHI_EVENT_CONFIG_CTRL(0, 64),
>  	/* DIAG dedicated event ring */
> @@ -305,7 +305,7 @@ static const struct mhi_channel_config mhi_quectel_em1xx_channels[] = {
>  	MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 128, 3),
>  };
>  
> -static struct mhi_event_config mhi_quectel_em1xx_events[] = {
> +static const struct mhi_event_config mhi_quectel_em1xx_events[] = {
>  	MHI_EVENT_CONFIG_CTRL(0, 128),
>  	MHI_EVENT_CONFIG_DATA(1, 128),
>  	MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100),
> @@ -344,7 +344,7 @@ static const struct mhi_channel_config mhi_foxconn_sdx55_channels[] = {
>  	MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 128, 3),
>  };
>  
> -static struct mhi_event_config mhi_foxconn_sdx55_events[] = {
> +static struct const mhi_event_config mhi_foxconn_sdx55_events[] = {

const struct?

Thanks,
Mani

>  	MHI_EVENT_CONFIG_CTRL(0, 128),
>  	MHI_EVENT_CONFIG_DATA(1, 128),
>  	MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100),
> @@ -391,7 +391,7 @@ static const struct mhi_channel_config mhi_mv3x_channels[] = {
>  	MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 512, 3),
>  };
>  
> -static struct mhi_event_config mhi_mv3x_events[] = {
> +static const struct mhi_event_config mhi_mv3x_events[] = {
>  	MHI_EVENT_CONFIG_CTRL(0, 256),
>  	MHI_EVENT_CONFIG_DATA(1, 256),
>  	MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100),
> @@ -438,7 +438,7 @@ static const struct mhi_channel_config mhi_sierra_em919x_channels[] = {
>  	MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0", 512, 2),
>  };
>  
> -static struct mhi_event_config modem_sierra_em919x_mhi_events[] = {
> +static const struct mhi_event_config modem_sierra_em919x_mhi_events[] = {
>  	/* first ring is control+data and DIAG ring */
>  	MHI_EVENT_CONFIG_CTRL(0, 2048),
>  	/* Hardware channels request dedicated hardware event rings */
> @@ -472,7 +472,7 @@ static const struct mhi_channel_config mhi_telit_fn980_hw_v1_channels[] = {
>  	MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0", 128, 2),
>  };
>  
> -static struct mhi_event_config mhi_telit_fn980_hw_v1_events[] = {
> +static const struct mhi_event_config mhi_telit_fn980_hw_v1_events[] = {
>  	MHI_EVENT_CONFIG_CTRL(0, 128),
>  	MHI_EVENT_CONFIG_HW_DATA(1, 1024, 100),
>  	MHI_EVENT_CONFIG_HW_DATA(2, 2048, 101)
> @@ -511,7 +511,7 @@ static const struct mhi_channel_config mhi_telit_fn990_channels[] = {
>  	MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 128, 3),
>  };
>  
> -static struct mhi_event_config mhi_telit_fn990_events[] = {
> +static const struct mhi_event_config mhi_telit_fn990_events[] = {
>  	MHI_EVENT_CONFIG_CTRL(0, 128),
>  	MHI_EVENT_CONFIG_DATA(1, 128),
>  	MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100),
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index a5441ad33c74..ada2f18af4d6 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -281,7 +281,7 @@ struct mhi_controller_config {
>  	u32 num_channels;
>  	const struct mhi_channel_config *ch_cfg;
>  	u32 num_events;
> -	struct mhi_event_config *event_cfg;
> +	const struct mhi_event_config *event_cfg;
>  	bool use_bounce_buf;
>  	bool m2_no_db;
>  };
> -- 
> 2.37.0
>