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AJvYcCXDov3g0ymCpmxPpPfpWtY0UJKwy+hscnj3tzNTyTmThETWSPm8bpG5nBcBTlMWh/hzzoKjkqvKltdhJy7MZleeHhhCoZmeTtvfzKAXmQ== X-Gm-Message-State: AOJu0YxJIE+pLYfB5cqMxLlDfotufBxoIKwhR9gouAIYx6nw2UY09Udf 1kYpHgkt5at1fGIPwpmgqwsvXYP9C22uqOATS0Vq/1n88joJ1dLEsRC3k+PJbVKX0t0YrLmZwDv TjR8kDBSAaA== X-Google-Smtp-Source: AGHT+IHAgakRN1GMcYnGCFXgcp0S6jDEiv/2+gY/KRM4h43j6n7j458O2RZcU7HXGWBkkYoEbxUyhX44RKGCPA== X-Received: from joychakr.c.googlers.com ([fda3:e722:ac3:cc00:4f:4b78:c0a8:6ea]) (user=joychakr job=sendgmr) by 2002:a05:6902:154f:b0:de5:1f88:ae4e with SMTP id r15-20020a056902154f00b00de51f88ae4emr651015ybu.2.1713944570760; Wed, 24 Apr 2024 00:42:50 -0700 (PDT) Date: Wed, 24 Apr 2024 07:42:41 +0000 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.44.0.769.g3c40516874-goog Message-ID: <20240424074242.519895-1-joychakr@google.com> Subject: [PATCH v2 0/1] nvmem: Handle actual amount of data read/written by suppliers From: Joy Chakraborty To: Hector Martin , Sven Peter , Alyssa Rosenzweig , Srinivas Kandagatla , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Vladimir Zapolskiy , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Claudiu Beznea , Matthias Brugger , AngeloGioacchino Del Regno , Bjorn Andersson , Konrad Dybcio , Heiko Stuebner , Orson Zhai , Baolin Wang , Chunyan Zhang , Maxime Coquelin , Alexandre Torgue , Vincent Shih , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Rafal Milecki , Kunihiko Hayashi , Masami Hiramatsu , Michal Simek Cc: Greg Kroah-Hartman , asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, linux-sunxi@lists.linux.dev, manugautam@google.com, Joy Chakraborty This Patch series stems from discussions in patchset, "[PATCH v2] nvmem: rmem: Fix return value of rmem_read()" (https://lore.kernel.org/all/20240206042408.224138-1-joychakr@google.com/). Where we come across the fact that currently the nvmem suppliers do not actually let the core know how much data has been actually read or written. Instead they are expected to return 0 for success and the core assumes that the amount of data written is equal to what the core has requested. On addition this patchset will also add some guards and checks based on the count of data returned by the nvmem supplier. --- V2 Changes : Rebase on for-next. --- V1 Changes : Change read/write callback prototype to ssize_t and supplier changes to accomodate the same with core checks and bounds. --- Joy Chakraborty (1): nvmem: Change return type of reg read/write to ssize_t drivers/nvmem/apple-efuses.c | 7 +-- drivers/nvmem/bcm-ocotp.c | 12 ++--- drivers/nvmem/brcm_nvram.c | 10 ++-- drivers/nvmem/core.c | 83 +++++++++++++---------------- drivers/nvmem/imx-iim.c | 6 +-- drivers/nvmem/imx-ocotp-ele.c | 4 +- drivers/nvmem/imx-ocotp-scu.c | 12 ++--- drivers/nvmem/imx-ocotp.c | 10 ++-- drivers/nvmem/jz4780-efuse.c | 7 +-- drivers/nvmem/lan9662-otpc.c | 12 ++--- drivers/nvmem/layerscape-sfp.c | 11 ++-- drivers/nvmem/lpc18xx_eeprom.c | 14 ++--- drivers/nvmem/lpc18xx_otp.c | 6 +-- drivers/nvmem/meson-efuse.c | 22 +++++--- drivers/nvmem/meson-mx-efuse.c | 6 +-- drivers/nvmem/microchip-otpc.c | 6 +-- drivers/nvmem/mtk-efuse.c | 6 +-- drivers/nvmem/mxs-ocotp.c | 7 +-- drivers/nvmem/nintendo-otp.c | 6 +-- drivers/nvmem/qcom-spmi-sdam.c | 12 ++--- drivers/nvmem/qfprom.c | 14 ++--- drivers/nvmem/qoriq-efuse.c | 6 +-- drivers/nvmem/rave-sp-eeprom.c | 18 +++---- drivers/nvmem/rmem.c | 4 +- drivers/nvmem/rockchip-efuse.c | 19 +++---- drivers/nvmem/rockchip-otp.c | 19 +++---- drivers/nvmem/sc27xx-efuse.c | 3 +- drivers/nvmem/sec-qfprom.c | 4 +- drivers/nvmem/snvs_lpgpr.c | 17 +++--- drivers/nvmem/sprd-efuse.c | 8 +-- drivers/nvmem/stm32-bsec-optee-ta.c | 12 ++--- drivers/nvmem/stm32-bsec-optee-ta.h | 20 +++---- drivers/nvmem/stm32-romem.c | 26 ++++----- drivers/nvmem/sunplus-ocotp.c | 4 +- drivers/nvmem/sunxi_sid.c | 15 +++--- drivers/nvmem/u-boot-env.c | 6 +-- drivers/nvmem/uniphier-efuse.c | 6 +-- drivers/nvmem/vf610-ocotp.c | 7 +-- drivers/nvmem/zynqmp_nvmem.c | 13 ++--- include/linux/nvmem-provider.h | 4 +- 40 files changed, 253 insertions(+), 231 deletions(-)