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Tue, 20 Aug 2024 07:36:15 -0700 (PDT) Received: from localhost ([87.13.33.30]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a83838cfd5esm768068266b.78.2024.08.20.07.36.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Aug 2024 07:36:15 -0700 (PDT) From: Andrea della Porta To: Andrea della Porta , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Broadcom internal kernel review list , Linus Walleij , Catalin Marinas , Will Deacon , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Greg Kroah-Hartman , Nicolas Ferre , Claudiu Beznea , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Saravana Kannan , Bjorn Helgaas , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, Lee Jones , Andrew Lunn , Stefan Wahren Subject: [PATCH 04/11] of: address: Preserve the flags portion on 1:1 dma-ranges mapping Date: Tue, 20 Aug 2024 16:36:06 +0200 Message-ID: <5ca13a5b01c6c737f07416be53eb05b32811da21.1724159867.git.andrea.porta@suse.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 A missing or empty dma-ranges in a DT node implies a 1:1 mapping for dma translations. In this specific case, rhe current behaviour is to zero out the entire specifier so that the translation could be carried on as an offset from zero. This includes address specifier that has flags (e.g. PCI ranges). Once the flags portion has been zeroed, the translation chain is broken since the mapping functions will check the upcoming address specifier against mismatching flags, always failing the 1:1 mapping and its entire purpose of always succeeding. Set to zero only the address portion while passing the flags through. Signed-off-by: Andrea della Porta --- drivers/of/address.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/of/address.c b/drivers/of/address.c index d669ce25b5f9..5a6d55a67aa8 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -443,7 +443,8 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus, } if (ranges == NULL || rlen == 0) { offset = of_read_number(addr, na); - memset(addr, 0, pna * 4); + /* copy the address while preserving the flags */ + memset(addr + pbus->flag_cells, 0, (pna - pbus->flag_cells) * 4); pr_debug("empty ranges; 1:1 translation\n"); goto finish; }