linux-kernel - [PATCH 16/36] sh: dma-sysfs: move to use bus_get_dev

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Message-Id: <20230313182918.1312597-16-gregkh@linuxfoundation.org>
Date:   Mon, 13 Mar 2023 19:28:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     rafael@...nel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org
Subject: [PATCH 16/36] sh: dma-sysfs: move to use bus_get_dev_root()

Direct access to the struct bus_type dev_root pointer is going away soon
so replace that with a call to bus_get_dev_root() instead, which is what
it is there for.

Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc: Rich Felker <dalias@...c.org>
Cc: linux-sh@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
Note, this is a patch that is a prepatory cleanup as part of a larger
series of patches that is working on resolving some old driver core
design mistakes.  It will build and apply cleanly on top of 6.3-rc2 on
its own, but I'd prefer if I could take it through my driver-core tree
so that the driver core changes can be taken through there for 6.4-rc1.

 arch/sh/drivers/dma/dma-sysfs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/sh/drivers/dma/dma-sysfs.c b/arch/sh/drivers/dma/dma-sysfs.c
index 8ef318150f84..431bc18f0a41 100644
--- a/arch/sh/drivers/dma/dma-sysfs.c
+++ b/arch/sh/drivers/dma/dma-sysfs.c
@@ -45,13 +45,19 @@ static DEVICE_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
 
 static int __init dma_subsys_init(void)
 {
+	struct device *dev_root;
 	int ret;
 
 	ret = subsys_system_register(&dma_subsys, NULL);
 	if (unlikely(ret))
 		return ret;
 
-	return device_create_file(dma_subsys.dev_root, &dev_attr_devices);
+	dev_root = bus_get_dev_root(&dma_subsys);
+	if (dev_root) {
+		ret = device_create_file(dev_root, &dev_attr_devices);
+		put_device(dev_root);
+	}
+	return ret;
 }
 postcore_initcall(dma_subsys_init);
 
-- 
2.39.2