linux-kernel - [PATCH v2 1/4] bus: hisi_lpc: Don't dereference fwnode handle

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Message-Id: <20220708210859.6774-1-andriy.shevchenko@linux.intel.com>
Date:   Sat,  9 Jul 2022 00:08:56 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-kernel@...r.kernel.org
Cc:     john.garry@...wei.com
Subject: [PATCH v2 1/4] bus: hisi_lpc: Don't dereference fwnode handle

Use dev_fwnode() and acpi_fwnode_handle() instead of dereferencing
an fwnode handle directly, which is a better coding practice.

While at it, reuse fwnode instead of ACPI_COMPANION().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Acked-by: John Garry <john.garry@...wei.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
v2: added tags (John, Rafael), tweaked commit message (John)
 drivers/bus/hisi_lpc.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c
index 2e564803e786..6d432a07cbba 100644
--- a/drivers/bus/hisi_lpc.c
+++ b/drivers/bus/hisi_lpc.c
@@ -347,7 +347,7 @@ static int hisi_lpc_acpi_xlat_io_res(struct acpi_device *adev,
 	unsigned long sys_port;
 	resource_size_t len = resource_size(res);
 
-	sys_port = logic_pio_trans_hwaddr(&host->fwnode, res->start, len);
+	sys_port = logic_pio_trans_hwaddr(acpi_fwnode_handle(host), res->start, len);
 	if (sys_port == ~0UL)
 		return -EFAULT;
 
@@ -615,7 +615,6 @@ static void hisi_lpc_acpi_remove(struct device *hostdev)
 static int hisi_lpc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct acpi_device *acpi_device = ACPI_COMPANION(dev);
 	struct logic_pio_hwaddr *range;
 	struct hisi_lpc_dev *lpcdev;
 	resource_size_t io_end;
@@ -637,7 +636,7 @@ static int hisi_lpc_probe(struct platform_device *pdev)
 	if (!range)
 		return -ENOMEM;
 
-	range->fwnode = dev->fwnode;
+	range->fwnode = dev_fwnode(dev);
 	range->flags = LOGIC_PIO_INDIRECT;
 	range->size = PIO_INDIRECT_SIZE;
 	range->hostdata = lpcdev;
@@ -651,7 +650,7 @@ static int hisi_lpc_probe(struct platform_device *pdev)
 	}
 
 	/* register the LPC host PIO resources */
-	if (acpi_device)
+	if (is_acpi_device_node(range->fwnode))
 		ret = hisi_lpc_acpi_probe(dev);
 	else
 		ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
@@ -672,11 +671,10 @@ static int hisi_lpc_probe(struct platform_device *pdev)
 static int hisi_lpc_remove(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct acpi_device *acpi_device = ACPI_COMPANION(dev);
 	struct hisi_lpc_dev *lpcdev = dev_get_drvdata(dev);
 	struct logic_pio_hwaddr *range = lpcdev->io_host;
 
-	if (acpi_device)
+	if (is_acpi_device_node(range->fwnode))
 		hisi_lpc_acpi_remove(dev);
 	else
 		of_platform_depopulate(dev);
-- 
2.35.1