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[88.9.50.147]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49240ee9bc2sm93161565e9.1.2026.06.20.05.01.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 20 Jun 2026 05:01:51 -0700 (PDT) From: Sergio Paracuellos To: linux-gpio@vger.kernel.org Cc: linusw@kernel.org, brgl@kernel.org, vicencb@gmail.com, linux-kernel@vger.kernel.org, Sashiko Subject: [PATCH 3/4] gpio: mt7621: be sure IRQ domain is created before exposing GPIO chips Date: Sat, 20 Jun 2026 14:01:35 +0200 Message-ID: <20260620120136.2482872-4-sergio.paracuellos@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260620120136.2482872-1-sergio.paracuellos@gmail.com> References: <20260620120136.2482872-1-sergio.paracuellos@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Function 'mediatek_gpio_bank_probe()' registers three GPIO chips using 'devm_gpiochip_add_data()'. At this point, the chips become live and visible to consumers. However, the IRQ domain isn't allocated and set up until 'mt7621_gpio_irq_setup()' is called after the GPIO chips setup finishes. If a consumer requests a GPIO IRQ concurrently 'mt7621_gpio_to_irq()' can be called and pass a NULL irq domain pointer irq_create_mapping(), that can corrupt the mappings or cause a crash. Fix this possible problem seting up irq domain before GPIO chips setup is performed. Reported-by: Sashiko Signed-off-by: Sergio Paracuellos --- drivers/gpio/gpio-mt7621.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c index 57384ef74703..1b0b5247d3c9 100644 --- a/drivers/gpio/gpio-mt7621.c +++ b/drivers/gpio/gpio-mt7621.c @@ -466,12 +466,6 @@ mediatek_gpio_probe(struct platform_device *pdev) mtk->num_gpios = MTK_BANK_WIDTH * MTK_BANK_CNT; platform_set_drvdata(pdev, mtk); - for (i = 0; i < MTK_BANK_CNT; i++) { - ret = mediatek_gpio_bank_probe(dev, i); - if (ret) - return ret; - } - if (mtk->gpio_irq > 0) { ret = mt7621_gpio_irq_setup(pdev, mtk); if (ret) @@ -482,6 +476,12 @@ mediatek_gpio_probe(struct platform_device *pdev) if (ret) return ret; + for (i = 0; i < MTK_BANK_CNT; i++) { + ret = mediatek_gpio_bank_probe(dev, i); + if (ret) + return ret; + } + return 0; } -- 2.43.0