linux-kernel - Re: [PATCH] scsi: ufs: qcom: fix platform_msi_domain_free

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Date:   Fri, 27 Jan 2023 11:32:21 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Can Guo <quic_cang@...cinc.com>, Arnd Bergmann <arnd@...db.de>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bart Van Assche <bvanassche@....org>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <beanhuo@...ron.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] scsi: ufs: qcom: fix platform_msi_domain_free_irqs()
 reference

On Thu, Jan 26, 2023 at 10:17:31PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The newly added MSI support is mostly hidden inside of an #ifdef,
> except for one line that now causes a build failure when MSI
> is disabled:
> 
> drivers/ufs/host/ufs-qcom.c: In function 'ufs_qcom_remove':
> drivers/ufs/host/ufs-qcom.c:1698:9: error: implicit declaration of function 'platform_msi_domain_free_irqs' [-Werror=i]
>  1698 |         platform_msi_domain_free_irqs(hba->dev);
>       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Above that, the symbol that guards the other call was recently
> removed, so that is all dead code at the moment.
> 
> Remove the incorrect #ifdef and instead of a Kconfig dependency
> to only allow building the driver when CONFIG_GENERIC_MSI_IRQ
> is enabled. This symbol is always present when PCI_MSI
> or ARM_GIC_V3_ITS are enabled, both of which should be present
> on kernels that can run on Qualcomm SoCs.
> 
> The 'select RESET_CONTROLLER' in combination with this dependency
> unfortunately causes a dependency loop and this is a user-visible
> symbol, so it's better to change both to 'depends on'.
> 
> Fixes: 519b6274a777 ("scsi: ufs: qcom: Add MCQ ESI config vendor specific ops")
> Fixes: 13e7accb81d6 ("genirq: Get rid of GENERIC_MSI_IRQ_DOMAIN")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

> ---
> Not sure if this is the best solution, both the GENERIC_MSI_IRQ
> dependencies and the RESET_CONTROLLER dependencies are a bit
> inconsistent already. Feel free to pick another approach that
> addresses both of the bugs I found.

I think your proposed solution works best at the moment.

Thanks,
Mani

> ---
>  drivers/ufs/host/Kconfig    | 3 ++-
>  drivers/ufs/host/ufs-qcom.c | 8 --------
>  2 files changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/ufs/host/Kconfig b/drivers/ufs/host/Kconfig
> index 139064e70a34..663881437921 100644
> --- a/drivers/ufs/host/Kconfig
> +++ b/drivers/ufs/host/Kconfig
> @@ -57,8 +57,9 @@ config SCSI_UFS_DWC_TC_PLATFORM
>  config SCSI_UFS_QCOM
>  	tristate "QCOM specific hooks to UFS controller platform driver"
>  	depends on SCSI_UFSHCD_PLATFORM && ARCH_QCOM
> +	depends on GENERIC_MSI_IRQ
> +	depends on RESET_CONTROLLER
>  	select QCOM_SCM if SCSI_UFS_CRYPTO
> -	select RESET_CONTROLLER
>  	help
>  	  This selects the QCOM specific additions to UFSHCD platform driver.
>  	  UFS host on QCOM needs some vendor specific configuration before
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 681da3ea7154..eb66b5f6cf19 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -1538,7 +1538,6 @@ static int ufs_qcom_get_outstanding_cqs(struct ufs_hba *hba,
>  	return 0;
>  }
>  
> -#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
>  static void ufs_qcom_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
>  {
>  	struct device *dev = msi_desc_to_dev(desc);
> @@ -1626,13 +1625,6 @@ static int ufs_qcom_config_esi(struct ufs_hba *hba)
>  	return ret;
>  }
>  
> -#else
> -static int ufs_qcom_config_esi(struct ufs_hba *hba)
> -{
> -	return -EOPNOTSUPP;
> -}
> -#endif
> -
>  /*
>   * struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
>   *
> -- 
> 2.39.0
> 

-- 
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