[PATCH v4 2/4] firmware: qcom_scm: Clear scm pointer on probe failure

From: Maximilian Luz <luzmaximilian@gmail.com>
To: Bjorn Andersson <andersson@kernel.org>
Cc: Maximilian Luz <luzmaximilian@gmail.com>,
	Andy Gross <agross@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	Ard Biesheuvel <ardb@kernel.org>,
	Ilias Apalodimas <ilias.apalodimas@linaro.org>,
	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Johan Hovold <johan@kernel.org>,
	Steev Klimaszewski <steev@kali.org>,
	linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v4 2/4] firmware: qcom_scm: Clear scm pointer on probe failure
Date: Mon, 29 May 2023 01:03:49 +0200	[thread overview]
Message-ID: <20230528230351.168210-3-luzmaximilian@gmail.com> (raw)
In-Reply-To: <20230528230351.168210-1-luzmaximilian@gmail.com>

When setting-up the IRQ goes wrong, the __scm pointer currently remains
set even though we fail to probe the driver successfully. Due to this,
access to __scm may go wrong since associated resources (clocks, ...)
have been released. Therefore, clear the __scm pointer when setting-up
the IRQ fails.

Fixes: 6bf325992236 ("firmware: qcom: scm: Add wait-queue handling logic")
Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
---

Patch introduced in v4

---
 drivers/firmware/qcom_scm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index fde33acd46b7..d0070b833889 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -1488,8 +1488,10 @@ static int qcom_scm_probe(struct platform_device *pdev)
 	} else {
 		ret = devm_request_threaded_irq(__scm->dev, irq, NULL, qcom_scm_irq_handler,
 						IRQF_ONESHOT, "qcom-scm", __scm);
-		if (ret < 0)
+		if (ret < 0) {
+			__scm = NULL;
 			return dev_err_probe(scm->dev, ret, "Failed to request qcom-scm irq\n");
+		}
 	}
 
 	__get_convention();
-- 
2.40.1

