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Sat, 24 Oct 2026 19:27:20 -0700 (PDT) Received: from d.home.yangfl.dn42 ([2a09:bac5:6216:1250::1d3:c4]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3adebad6306sm3064944a91.2.2026.10.24.19.27.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 24 Oct 2026 19:27:19 -0700 (PDT) From: David Yang To: linux-media@vger.kernel.org Cc: David Yang , stable@vger.kernel.org, Sean Young , Mauro Carvalho Chehab , Zhangfei Gao , Guoxiong Yan , linux-kernel@vger.kernel.org Subject: [PATCH] media: rc: ir-hix5hd2: set up device data before requesting the IRQ Date: Sun, 25 Oct 2026 10:27:02 +0800 Message-ID: <20261025022706.1905466-1-mmyangfl@gmail.com> X-Mailer: git-send-email 2.53.0 X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The hix5hd2 IR interrupt handler passes priv->rdev to the ir_raw_event_*() helpers, which dereference it immediately, and devm_request_irq() unmasks the line as soon as it is called, so the handler can run before probe() returns. hix5hd2_ir_probe() has requested the IRQ before assigning priv->rdev since the driver was introduced, so an interrupt already pending when the line is requested, e.g. decoded symbols left by the boot firmware, would pass a NULL rc_dev to ir_raw_event_store(). On Hi3716CV200 the handler ran 8 ms after the device was bound and took a NULL-pointer fault in ir_raw_event_store() from interrupt context; on Hi3798MV200H the same fault killed every boot 25 s into startup. Request the IRQ only after the device data is set up. The same ordering was fixed for talitos in commit 666d66df2525 ("crypto: talitos - init tasklets before requesting IRQs") and for bgmac in commit ac1f6e58cb77 ("net: bgmac: enable interrupts only after NAPI is ready"). Fixes: a84fcdaa9058 ("[media] rc: Introduce hix5hd2 IR transmitter driver") Cc: stable@vger.kernel.org Signed-off-by: David Yang --- drivers/media/rc/ir-hix5hd2.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/media/rc/ir-hix5hd2.c b/drivers/media/rc/ir-hix5hd2.c index 1b061e4a3dcf..c3b984a0c2e4 100644 --- a/drivers/media/rc/ir-hix5hd2.c +++ b/drivers/media/rc/ir-hix5hd2.c @@ -316,6 +316,10 @@ static int hix5hd2_ir_probe(struct platform_device *pdev) if (ret < 0) goto clkerr; + priv->rdev = rdev; + priv->dev = dev; + platform_set_drvdata(pdev, priv); + if (devm_request_irq(dev, priv->irq, hix5hd2_ir_rx_interrupt, 0, pdev->name, priv) < 0) { dev_err(dev, "IRQ %d register failed\n", priv->irq); @@ -323,10 +327,6 @@ static int hix5hd2_ir_probe(struct platform_device *pdev) goto regerr; } - priv->rdev = rdev; - priv->dev = dev; - platform_set_drvdata(pdev, priv); - return ret; regerr: -- 2.53.0