linux-kernel - [PATCH v2 2/2] firmware: stratix10-svc: fix bug in saving controller data

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Message-Id: <20230621064645.1431883-3-tien.sung.ang@intel.com>
Date:   Wed, 21 Jun 2023 14:46:45 +0800
From:   tien.sung.ang@...el.com
To:     Dinh Nguyen <dinguyen@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Ang Tien Sung <tien.sung.ang@...el.com>
Subject: [PATCH v2 2/2] firmware: stratix10-svc: fix bug in saving controller data

From: Ang Tien Sung <tien.sung.ang@...el.com>

Fix the incorrect usage of platform_set_drvdata and dev_set_drvdata.
They both are of the same data and overrides each other. This resulted
in the rmmod of the svc driver to fail and throw a kernel panic
for kthread_stop and fifo free.

Fixes: b5dc75c915cd ("firmware: stratix10-svc: extend svc to support new RSU features")
Signed-off-by: Ang Tien Sung <tien.sung.ang@...el.com>
---
 drivers/firmware/stratix10-svc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
index ca713f39107e..60e08987c402 100644
--- a/drivers/firmware/stratix10-svc.c
+++ b/drivers/firmware/stratix10-svc.c
@@ -130,6 +130,7 @@ struct stratix10_svc_data {
  * @complete_status: state for completion
  * @invoke_fn: function to issue secure monitor call or hypervisor call
  * @sdm_lock: a mutex lock to allow only one pending sdm message per client
+ * @svc: manages the list of client svc drivers
  *
  * This struct is used to create communication channels for service clients, to
  * handle secure monitor or hypervisor call.
@@ -144,6 +145,7 @@ struct stratix10_svc_controller {
 	svc_invoke_fn *invoke_fn;
 	/* Enforces atomic command sending to SDM */
 	struct mutex *sdm_lock;
+	struct stratix10_svc *svc;
 };
 
 /**
@@ -1252,6 +1254,7 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 		ret = -ENOMEM;
 		goto err_free_kfifo;
 	}
+	controller->svc = svc;
 
 	svc->stratix10_svc_rsu = platform_device_alloc(STRATIX10_RSU, 0);
 	if (!svc->stratix10_svc_rsu) {
@@ -1279,8 +1282,6 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 		goto err_unregister_dev;
 	}
 
-	dev_set_drvdata(dev, svc);
-
 	pr_info("Intel Service Layer Driver Initialized\n");
 
 	return 0;
@@ -1296,8 +1297,8 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 
 static int stratix10_svc_drv_remove(struct platform_device *pdev)
 {
-	struct stratix10_svc *svc = dev_get_drvdata(&pdev->dev);
 	struct stratix10_svc_controller *ctrl = platform_get_drvdata(pdev);
+	struct stratix10_svc *svc = ctrl->svc;
 
 	platform_device_unregister(svc->intel_svc_fcs);
 	platform_device_unregister(svc->stratix10_svc_rsu);
-- 
2.25.1