Re: [RFC] platform/x86: hp-wmi: make hp_wmi_perform_query() work with certain devices

[Bedant Patnaik <bedant.patnaik@gmail.com>]

Greetings Hans, Jorge,

I have sent the zero_if_supp() patch that can be applied over Jorge's buffer size patch in the mail that I'm replying to.
This *should* be enough as the final patch. Please let me know if anything needs to be rectified.

All your input is welcome.

Thank you.

On Thu, 2022-06-09 at 00:58 +0530, Bedant Patnaik wrote:
> From 26f84d835819fa38872c673f49f1b77774927568 Mon Sep 17 00:00:00 2001
> From: Bedant Patnaik <bedant.patnaik@gmail.com>
> Date: Thu, 9 Jun 2022 00:50:53 +0530
> Subject: [PATCH] Use zero insize parameter only when supported
> 
> be9d73e64957bbd31ee9a0d11adc0f720974c558 ("platform/x86: hp-wmi: Fix 0x05 error code reported by several WMI calls")
> and 12b19f14a21a2ee6348825d95b642ef2cd16794f ("platform/x86: hp-wmi: Fix hp_wmi_read_int() reporting error (0x05)")
> cause ACPI BIOS Error (bug): Attempt to CreateField of length zero (20211217/dsopcode-133) because of the ACPI
> method HWMC, which unconditionally creates a Field of size (insize*8) bits:
>         CreateField (Arg1, 0x80, (Local5 * 0x08), DAIN)
> In cases where args->insize = 0, the Field size is 0, resulting in an error.
> Fix: use zero insize only if 0x5 error code is returned
> 
> Tested on Omen 15 AMD (2020) board ID: 8786.
> 
> Signed-off-by: Bedant Patnaik <bedant.patnaik@gmail.com>
> ---
>  drivers/platform/x86/hp-wmi.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
> index 277397de5..0e07581b8 100644
> --- a/drivers/platform/x86/hp-wmi.c
> +++ b/drivers/platform/x86/hp-wmi.c
> @@ -38,6 +38,7 @@ MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
>  #define HPWMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C"
>  #define HPWMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4"
>  #define HP_OMEN_EC_THERMAL_PROFILE_OFFSET 0x95
> +#define zero_if_sup(tmp) (zero_insize_support?0:sizeof(tmp)) // use when zero insize is required
>  
>  /* DMI board names of devices that should use the omen specific path for
>   * thermal profiles.
> @@ -220,6 +221,7 @@ static struct input_dev *hp_wmi_input_dev;
>  static struct platform_device *hp_wmi_platform_dev;
>  static struct platform_profile_handler platform_profile_handler;
>  static bool platform_profile_support;
> +static bool zero_insize_support;
>  
>  static struct rfkill *wifi_rfkill;
>  static struct rfkill *bluetooth_rfkill;
> @@ -376,7 +378,7 @@ static int hp_wmi_read_int(int query)
>         int val = 0, ret;
>  
>         ret = hp_wmi_perform_query(query, HPWMI_READ, &val,
> -                                  0, sizeof(val));
> +                                  zero_if_sup(val), sizeof(val));
>  
>         if (ret)
>                 return ret < 0 ? ret : -EINVAL;
> @@ -412,7 +414,8 @@ static int hp_wmi_get_tablet_mode(void)
>                 return -ENODEV;
>  
>         ret = hp_wmi_perform_query(HPWMI_SYSTEM_DEVICE_MODE, HPWMI_READ,
> -                                  system_device_mode, 0, sizeof(system_device_mode));
> +                                  system_device_mode, zero_if_sup(system_device_mode),
> +                                  sizeof(system_device_mode));
>         if (ret < 0)
>                 return ret;
>  
> @@ -499,7 +502,7 @@ static int hp_wmi_fan_speed_max_get(void)
>         int val = 0, ret;
>  
>         ret = hp_wmi_perform_query(HPWMI_FAN_SPEED_MAX_GET_QUERY, HPWMI_GM,
> -                                  &val, 0, sizeof(val));
> +                                  &val, zero_if_sup(val), sizeof(val));
>  
>         if (ret)
>                 return ret < 0 ? ret : -EINVAL;
> @@ -511,7 +514,7 @@ static int __init hp_wmi_bios_2008_later(void)
>  {
>         int state = 0;
>         int ret = hp_wmi_perform_query(HPWMI_FEATURE_QUERY, HPWMI_READ, &state,
> -                                      0, sizeof(state));
> +                                      zero_if_sup(state), sizeof(state));
>         if (!ret)
>                 return 1;
>  
> @@ -522,7 +525,7 @@ static int __init hp_wmi_bios_2009_later(void)
>  {
>         u8 state[128];
>         int ret = hp_wmi_perform_query(HPWMI_FEATURE2_QUERY, HPWMI_READ, &state,
> -                                      0, sizeof(state));
> +                                      zero_if_sup(state), sizeof(state));
>         if (!ret)
>                 return 1;
>  
> @@ -600,7 +603,7 @@ static int hp_wmi_rfkill2_refresh(void)
>         int err, i;
>  
>         err = hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, HPWMI_READ, &state,
> -                                  0, sizeof(state));
> +                                  zero_if_sup(state), sizeof(state));
>         if (err)
>                 return err;
>  
> @@ -1009,7 +1012,7 @@ static int __init hp_wmi_rfkill2_setup(struct platform_device *device)
>         int err, i;
>  
>         err = hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, HPWMI_READ, &state,
> -                                  0, sizeof(state));
> +                                  zero_if_sup(state), sizeof(state));
>         if (err)
>                 return err < 0 ? err : -EINVAL;
>  
> @@ -1485,11 +1488,15 @@ static int __init hp_wmi_init(void)
>  {
>         int event_capable = wmi_has_guid(HPWMI_EVENT_GUID);
>         int bios_capable = wmi_has_guid(HPWMI_BIOS_GUID);
> -       int err;
> +       int err, tmp = 0;
>  
>         if (!bios_capable && !event_capable)
>                 return -ENODEV;
>  
> +       if (hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, HPWMI_READ, &tmp,
> +                                sizeof(tmp), sizeof(tmp)) == HPWMI_RET_INVALID_PARAMETERS)
> +               zero_insize_support = true;
> +
>         if (event_capable) {
>                 err = hp_wmi_input_setup();
>                 if (err)