linux-kernel - [PATCH 1/5] platform/chrome: cros_ec_lpc: Move mec

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Date:   Fri, 28 Oct 2022 14:14:45 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Cc:     chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>
Subject: [PATCH 1/5] platform/chrome: cros_ec_lpc: Move mec_init/destroy to device probe/remove

Disregarding the weird global state hiding in this cros_ec_lpc_mec_*()
stuff, it belongs in device probe/remove. We shouldn't assume we can
access hardware resources when the device isn't attached to the driver.

Signed-off-by: Brian Norris <briannorris@...omium.org>
---

 drivers/platform/chrome/cros_ec_lpc.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 7677ab3c0ead..0b6c7c912ec7 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -354,6 +354,9 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
 		return -EBUSY;
 	}
 
+	cros_ec_lpc_mec_init(EC_HOST_CMD_REGION0,
+			     EC_LPC_ADDR_MEMMAP + EC_MEMMAP_SIZE);
+
 	/*
 	 * Read the mapped ID twice, the first one is assuming the
 	 * EC is a Microchip Embedded Controller (MEC) variant, if the
@@ -456,6 +459,8 @@ static int cros_ec_lpc_remove(struct platform_device *pdev)
 
 	cros_ec_unregister(ec_dev);
 
+	cros_ec_lpc_mec_destroy();
+
 	return 0;
 }
 
@@ -586,9 +591,6 @@ static int __init cros_ec_lpc_init(void)
 		return -ENODEV;
 	}
 
-	cros_ec_lpc_mec_init(EC_HOST_CMD_REGION0,
-			     EC_LPC_ADDR_MEMMAP + EC_MEMMAP_SIZE);
-
 	/* Register the driver */
 	ret = platform_driver_register(&cros_ec_lpc_driver);
 	if (ret) {
@@ -615,7 +617,6 @@ static void __exit cros_ec_lpc_exit(void)
 	if (!cros_ec_lpc_acpi_device_found)
 		platform_device_unregister(&cros_ec_lpc_device);
 	platform_driver_unregister(&cros_ec_lpc_driver);
-	cros_ec_lpc_mec_destroy();
 }
 
 module_init(cros_ec_lpc_init);
-- 
2.38.1.273.g43a17bfeac-goog