linux-kernel - [PATCH RESEND drm-misc 4/4] dma-buf: heaps: make dma_heap

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Message-Id: <20240305-class_cleanup-drm-v1-4-94f82740525a@marliere.net>
Date: Tue, 05 Mar 2024 08:34:13 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Hans de Goede <hdegoede@...hat.com>, Helge Deller <deller@....de>, 
 Sumit Semwal <sumit.semwal@...aro.org>, 
 Benjamin Gaignard <benjamin.gaignard@...labora.com>, 
 Brian Starkey <Brian.Starkey@....com>, John Stultz <jstultz@...gle.com>, 
 "T.J. Mercier" <tjmercier@...gle.com>, 
 Christian König <christian.koenig@....com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-fbdev@...r.kernel.org, linux-media@...r.kernel.org, 
 linaro-mm-sig@...ts.linaro.org, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH RESEND drm-misc 4/4] dma-buf: heaps: make dma_heap_class
 constant

Since commit 43a7206b0963 ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the dma_heap_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 drivers/dma-buf/dma-heap.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
index 84ae708fafe7..bcca6a2bbce8 100644
--- a/drivers/dma-buf/dma-heap.c
+++ b/drivers/dma-buf/dma-heap.c
@@ -43,10 +43,18 @@ struct dma_heap {
 	struct cdev heap_cdev;
 };

+static char *dma_heap_devnode(const struct device *dev, umode_t *mode)
+{
+	return kasprintf(GFP_KERNEL, "dma_heap/%s", dev_name(dev));
+}
+
 static LIST_HEAD(heap_list);
 static DEFINE_MUTEX(heap_list_lock);
 static dev_t dma_heap_devt;
-static struct class *dma_heap_class;
+static struct class dma_heap_class = {
+	.name = DEVNAME,
+	.devnode = dma_heap_devnode,
+};
 static DEFINE_XARRAY_ALLOC(dma_heap_minors);

 static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
@@ -261,7 +269,7 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
 		goto err1;
 	}

-	dev_ret = device_create(dma_heap_class,
+	dev_ret = device_create(&dma_heap_class,
 				NULL,
 				heap->heap_devt,
 				NULL,
@@ -291,7 +299,7 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
 	return heap;

 err3:
-	device_destroy(dma_heap_class, heap->heap_devt);
+	device_destroy(&dma_heap_class, heap->heap_devt);
 err2:
 	cdev_del(&heap->heap_cdev);
 err1:
@@ -301,11 +309,6 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
 	return err_ret;
 }

-static char *dma_heap_devnode(const struct device *dev, umode_t *mode)
-{
-	return kasprintf(GFP_KERNEL, "dma_heap/%s", dev_name(dev));
-}
-
 static int dma_heap_init(void)
 {
 	int ret;
@@ -314,12 +317,11 @@ static int dma_heap_init(void)
 	if (ret)
 		return ret;

-	dma_heap_class = class_create(DEVNAME);
-	if (IS_ERR(dma_heap_class)) {
+	ret = class_register(&dma_heap_class);
+	if (ret) {
 		unregister_chrdev_region(dma_heap_devt, NUM_HEAP_MINORS);
-		return PTR_ERR(dma_heap_class);
+		return ret;
 	}
-	dma_heap_class->devnode = dma_heap_devnode;

 	return 0;
 }

-- 
2.43.0