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dma-contiguous: check for memory region overlap

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In the process of parsing the DTS, check whether the memory region
specified by the DTS CMA node area overlaps with the kernel text
memory space reserved by memblock before calling
early_init_fdt_scan_reserved_mem.

Signed-off-by: Binglei Wang <l3b2w1@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Binglei Wang 2023-07-26 22:28:23 +08:00 committed by Christoph Hellwig
parent bf29bfaa54
commit 3fa6456ebe
1 changed files with 5 additions and 0 deletions
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5
kernel/dma/contiguous.c
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@ -473,6 +473,11 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem)
return -EBUSY;
}
if (memblock_is_region_reserved(rmem->base, rmem->size)) {
pr_info("Reserved memory: overlap with other memblock reserved region\n");
return -EBUSY;
}
if (!of_get_flat_dt_prop(node, "reusable", NULL) ||
of_get_flat_dt_prop(node, "no-map", NULL))
return -EINVAL;