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-rw-r--r--kernel/dma/swiotlb.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 50a0e9c45c39..394494a6b1f3 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -903,9 +903,7 @@ static inline phys_addr_t slot_addr(phys_addr_t start, phys_addr_t idx)
*/
static inline unsigned long get_max_slots(unsigned long boundary_mask)
{
- if (boundary_mask == ~0UL)
- return 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
- return nr_slots(boundary_mask + 1);
+ return (boundary_mask >> IO_TLB_SHIFT) + 1;
}
static unsigned int wrap_area_index(struct io_tlb_pool *mem, unsigned int index)