| From | Robert Richter <> | Subject | [PATCH 02/15] cxl/core: Check physical address before mapping it in devm_cxl_iomap_block() | Date | Wed, 31 Aug 2022 10:15:50 +0200 |
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The physical base address of a CXL range can be invalid and is then set to CXL_RESOURCE_NONE. Early check this case before mapping a memory block in devm_cxl_iomap_block().
Signed-off-by: Robert Richter <rrichter@amd.com> --- drivers/cxl/core/regs.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c index 39a129c57d40..f216c017a474 100644 --- a/drivers/cxl/core/regs.c +++ b/drivers/cxl/core/regs.c @@ -165,6 +165,9 @@ void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr, void __iomem *ret_val; struct resource *res; + if (addr == CXL_RESOURCE_NONE) + return NULL; + res = devm_request_mem_region(dev, addr, length, dev_name(dev)); if (!res) { resource_size_t end = addr + length - 1; -- 2.30.2
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