disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/media/v4l2-core/videobuf-dma-contig.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * helper functions for physically contiguous capture buffers
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  *
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@@ -8,10 +9,6 @@
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  *
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  * Based on videobuf-vmalloc.c,
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  * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2
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  */
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13
 
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 #include <linux/init.h>
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@@ -39,12 +36,11 @@
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36
 
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 static int __videobuf_dc_alloc(struct device *dev,
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 			       struct videobuf_dma_contig_memory *mem,
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-			       unsigned long size, gfp_t flags)
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+			       unsigned long size)
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 {
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 	mem->size = size;
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-	mem->vaddr = dma_alloc_coherent(dev, mem->size,
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-					&mem->dma_handle, flags);
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-
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+	mem->vaddr = dma_alloc_coherent(dev, mem->size, &mem->dma_handle,
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+					GFP_KERNEL);
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 	if (!mem->vaddr) {
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 		dev_err(dev, "memory alloc size %ld failed\n", mem->size);
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 		return -ENOMEM;
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@@ -172,7 +168,7 @@
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 	mem->size = PAGE_ALIGN(vb->size + offset);
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 	ret = -EINVAL;
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-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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 	vma = find_vma(mm, untagged_baddr);
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 	if (!vma)
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@@ -204,7 +200,7 @@
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 	}
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 out_up:
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-	up_read(&current->mm->mmap_sem);
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+	mmap_read_unlock(current->mm);
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 	return ret;
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 }
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@@ -249,7 +245,7 @@
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 		/* All handling should be done by __videobuf_mmap_mapper() */
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 		if (!mem->vaddr) {
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-			dev_err(q->dev, "memory is not alloced/mmapped.\n");
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+			dev_err(q->dev, "memory is not allocated/mmapped.\n");
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 			return -EINVAL;
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 		}
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 		break;
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@@ -261,8 +257,7 @@
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 			return videobuf_dma_contig_user_get(mem, vb);
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 		/* allocate memory for the read() method */
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-		if (__videobuf_dc_alloc(q->dev, mem, PAGE_ALIGN(vb->size),
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-					GFP_KERNEL))
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+		if (__videobuf_dc_alloc(q->dev, mem, PAGE_ALIGN(vb->size)))
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 			return -ENOMEM;
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 		break;
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 	case V4L2_MEMORY_OVERLAY:
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@@ -281,7 +276,6 @@
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 	struct videobuf_dma_contig_memory *mem;
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 	struct videobuf_mapping *map;
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 	int retval;
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-	unsigned long size;
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 	dev_dbg(q->dev, "%s\n", __func__);
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..
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@@ -299,23 +293,18 @@
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 	BUG_ON(!mem);
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 	MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
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-	if (__videobuf_dc_alloc(q->dev, mem, PAGE_ALIGN(buf->bsize),
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-				GFP_KERNEL | __GFP_COMP))
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+	if (__videobuf_dc_alloc(q->dev, mem, PAGE_ALIGN(buf->bsize)))
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 		goto error;
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-
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-	/* Try to remap memory */
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-	size = vma->vm_end - vma->vm_start;
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-	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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 	/* the "vm_pgoff" is just used in v4l2 to find the
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 	 * corresponding buffer data structure which is allocated
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 	 * earlier and it does not mean the offset from the physical
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 	 * buffer start address as usual. So set it to 0 to pass
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-	 * the sanity check in vm_iomap_memory().
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+	 * the sanity check in dma_mmap_coherent().
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 	 */
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 	vma->vm_pgoff = 0;
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-
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-	retval = vm_iomap_memory(vma, mem->dma_handle, size);
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+	retval = dma_mmap_coherent(q->dev, vma, mem->vaddr, mem->dma_handle,
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+				   mem->size);
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 	if (retval) {
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 		dev_err(q->dev, "mmap: remap failed with error %d. ",
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 			retval);