redonkable/alistair23-linux
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PCI: endpoint: Cast the page number to phys_addr_t

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Modify pci_epc_mem_alloc_addr() to cast the variable 'pageno'
from type 'int' to 'phys_addr_t' before shifting left. This
cast is needed to avoid treating bit 31 of 'pageno' as the
sign bit which would otherwise get sign-extended to produce
a negative value. When added to the base address of PCI memory
space, the negative value would produce an invalid physical
address which falls before the start of the PCI memory space.

Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Alan Mikhak 2019-10-09 10:06:56 -07:00 committed by Lorenzo Pieralisi
parent 54ecb8f702
commit daee4f4e42
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/endpoint/pci-epc-mem.c
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@ -134,7 +134,7 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
if (pageno < 0)
return NULL;
*phys_addr = mem->phys_base + (pageno << page_shift);
*phys_addr = mem->phys_base + ((phys_addr_t)pageno << page_shift);
virt_addr = ioremap(*phys_addr, size);
if (!virt_addr)
bitmap_release_region(mem->bitmap, pageno, order);