linux-kernel - [PATCH 2/4] ACPI: Retire acpi_iommu_fwspec

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Date: Fri, 19 Apr 2024 17:56:00 +0100
From: Robin Murphy <robin.murphy@....com>
To: Will Deacon <will@...nel.org>,
	Joerg Roedel <joro@...tes.org>
Cc: linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev,
	devicetree@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Hanjun Guo <guohanjun@...wei.com>,
	Sudeep Holla <sudeep.holla@....com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Jean-Philippe Brucker <jean-philippe@...aro.org>
Subject: [PATCH 2/4] ACPI: Retire acpi_iommu_fwspec_ops()

Now that iommu_fwspec_init() can signal for probe deferral directly,
acpi_iommu_fwspec_ops() is unneeded and can be cleaned up.

Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/acpi/scan.c | 30 ++++++------------------------
 1 file changed, 6 insertions(+), 24 deletions(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 9d36fc3dc5ac..d6b64dcbf9a6 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1588,26 +1588,14 @@ int acpi_iommu_fwspec_init(struct device *dev, u32 id,
 	return ret;
 }
 
-static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
-{
-	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
-
-	return fwspec ? fwspec->ops : NULL;
-}
-
 static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
 {
 	int err;
-	const struct iommu_ops *ops;
 
 	/* Serialise to make dev->iommu stable under our potential fwspec */
 	mutex_lock(&iommu_probe_device_lock);
-	/*
-	 * If we already translated the fwspec there is nothing left to do,
-	 * return the iommu_ops.
-	 */
-	ops = acpi_iommu_fwspec_ops(dev);
-	if (ops) {
+	/* If we already translated the fwspec there is nothing left to do */
+	if (dev_iommu_fwspec_get(dev)) {
 		mutex_unlock(&iommu_probe_device_lock);
 		return 0;
 	}
@@ -1624,16 +1612,7 @@ static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
 	if (!err && dev->bus)
 		err = iommu_probe_device(dev);
 
-	/* Ignore all other errors apart from EPROBE_DEFER */
-	if (err == -EPROBE_DEFER) {
-		return err;
-	} else if (err) {
-		dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
-		return -ENODEV;
-	}
-	if (!acpi_iommu_fwspec_ops(dev))
-		return -ENODEV;
-	return 0;
+	return err;
 }
 
 #else /* !CONFIG_IOMMU_API */
@@ -1672,6 +1651,9 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
 	ret = acpi_iommu_configure_id(dev, input_id);
 	if (ret == -EPROBE_DEFER)
 		return -EPROBE_DEFER;
+	/* Ignore all other errors apart from EPROBE_DEFER */
+	if (ret)
+		dev_dbg(dev, "Adding to IOMMU failed: %d\n", ret);
 
 	arch_setup_dma_ops(dev, attr == DEV_DMA_COHERENT);
 
-- 
2.39.2.101.g768bb238c484.dirty