linux-kernel - Re: [PATCH] thermal: adding check if the thermal firmware is running

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Date: Fri, 17 May 2024 14:25:48 -0300
From: Guilherme Giácomo Simões <trintaeoitogc@...il.com>
To: Jonathan Bither <jonbither@...il.com>
Cc: miriam.rachel.korenblit@...el.com, kvalo@...nel.org, 
	rafael.j.wysocki@...el.com, daniel.lezcano@...aro.org, 
	johannes.berg@...el.com, dmantipov@...dex.ru, linux-wireless@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: adding check if the thermal firmware is running

Em sex., 17 de mai. de 2024 às 13:57, Jonathan Bither
<jonbither@...il.com> escreveu:
>
>
> On 5/17/24 10:16, Guilherme Giacomo Simoes wrote:
> > In the dmesg is showing the message "failed to read out thermal zone"
> > as if the temperature read is failed by don't find the thermal zone.
> >
> > After researching and debugging, I see that this specific error is
> > occurrenced because the thermal try read the temperature when is started,
> > but the firmware is not running yet.
> >
> > For more legibiliti i change the tt.c for return EAGAIN when this was occurrence.
> > After this change, in my computer I compile and install kernel in /boot
> > and in my dmesg the message "failed to read out thermal zone" is not show
> > any more.
> >
> > I would like to thanks for Rafael Wysocki <refael.j.wysocki@...el.com> for
> > your suggestions in mu first patch that results in this another patch.
> > ---
> >   drivers/net/wireless/intel/iwlwifi/mvm/tt.c | 10 ++++++++--
> >   1 file changed, 8 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tt.c b/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
> > index 8083c4b2ab6b..68ab9966330c 100644
> > --- a/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
> > +++ b/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
> > @@ -620,8 +620,14 @@ static int iwl_mvm_tzone_get_temp(struct thermal_zone_device *device,
> >
> >       mutex_lock(&mvm->mutex);
> >
> > -     if (!iwl_mvm_firmware_running(mvm) ||
> > -         mvm->fwrt.cur_fw_img != IWL_UCODE_REGULAR) {
> > +     const int res = iwl_mvm_firmware_running(mvm);
> > +
> > +     if (!res) {
> > +             ret = -EAGAIN;
> > +             goto out;
> > +     }
> > +
>
> You could skip using the res variable and move the mutex lock here and
> simplify the above a bit. Ex:
>
>          int temp;
>
> -       mutex_lock(&mvm->mutex);
> +       if (!iwl_mvm_firmware_running(mvm))
> +               return -EAGAIN;
>
> -       if (!iwl_mvm_firmware_running(mvm) ||
> -           mvm->fwrt.cur_fw_img != IWL_UCODE_REGULAR) {
> +       mutex_lock(&mvm->mutex);
> +       if (mvm->fwrt.cur_fw_img != IWL_UCODE_REGULAR) {
>                  ret = -ENODATA;
>                  goto out;
>          }
>
> > +     if (mvm->fwrt.cur_fw_img != IWL_UCODE_REGULAR) {
> >               ret = -ENODATA;
> >               goto out;
> >       }

Hey Jonathan, Thank you for your suggestion.
I sended a v2 patch of this patch
https://patchwork.kernel.org/project/linux-wireless/patch/20240517171311.3705-1-trintaeoitogc@gmail.com/

If you want, you can send this suggestion in this patch v2.

Thanks.