linux-kernel - [PATCH v4 1/7] OF: Retire dma-ranges mask workaround

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Date: Fri, 19 Apr 2024 17:54:40 +0100
From: Robin Murphy <robin.murphy@....com>
To: Joerg Roedel <joro@...tes.org>,
	Christoph Hellwig <hch@....de>
Cc: Vineet Gupta <vgupta@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Hanjun Guo <guohanjun@...wei.com>,
	Sudeep Holla <sudeep.holla@....com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>,
	Dexuan Cui <decui@...rosoft.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	David Woodhouse <dwmw2@...radead.org>,
	Lu Baolu <baolu.lu@...ux.intel.com>,
	Niklas Schnelle <schnelle@...ux.ibm.com>,
	Matthew Rosato <mjrosato@...ux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-acpi@...r.kernel.org,
	iommu@...ts.linux.dev,
	devicetree@...r.kernel.org,
	Rob Herring <robh@...nel.org>
Subject: [PATCH v4 1/7] OF: Retire dma-ranges mask workaround

The fixup adding 1 to the dma-ranges size may have been for the benefit
of some early AMD Seattle DTs, or may have merely been a just-in-case,
but either way anyone who might have deserved to get the message has
hopefully seen the warning in the 9 years we've had it there. The modern
dma_range_map mechanism should happily handle odd-sized ranges with no
ill effect, so there's little need to care anyway now. Clean it up.

Acked-by: Rob Herring <robh@...nel.org>
Signed-off-by: Robin Murphy <robin.murphy@....com>
---
v2: Tweak commit message
---
 drivers/of/device.c | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index de89f9906375..a988bee2ee5a 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -129,22 +129,6 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
 				dma_end = r->dma_start + r->size;
 		}
 		size = dma_end - dma_start;
-
-		/*
-		 * Add a work around to treat the size as mask + 1 in case
-		 * it is defined in DT as a mask.
-		 */
-		if (size & 1) {
-			dev_warn(dev, "Invalid size 0x%llx for dma-range(s)\n",
-				 size);
-			size = size + 1;
-		}
-
-		if (!size) {
-			dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
-			kfree(map);
-			return -EINVAL;
-		}
 	}
 
 	/*
-- 
2.39.2.101.g768bb238c484.dirty