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

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Date:   Thu, 26 Jan 2023 22:17:31 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Can Guo <quic_cang@...cinc.com>
Cc:     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: [PATCH] scsi: ufs: qcom: fix platform_msi_domain_free_irqs() reference

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>
---
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.
---
 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