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swiotlb: clean up swiotlb_tbl_unmap_single

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Remove a layer of pointless indentation, replace a hard to follow
ternary expression with a plain if/else.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jianxiong Gao <jxgao@google.com>
Tested-by: Jianxiong Gao <jxgao@google.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Christoph Hellwig 2021-02-04 10:13:40 +01:00 committed by Konrad Rzeszutek Wilk
parent c32a77fd18
commit ca10d0f8e5
1 changed files with 21 additions and 20 deletions
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41
kernel/dma/swiotlb.c
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@ -626,28 +626,29 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
* with slots below and above the pool being returned.
*/
spin_lock_irqsave(&io_tlb_lock, flags);
{
count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ?
io_tlb_list[index + nslots] : 0);
/*
* Step 1: return the slots to the free list, merging the
* slots with superceeding slots
*/
for (i = index + nslots - 1; i >= index; i--) {
io_tlb_list[i] = ++count;
io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
}
/*
* Step 2: merge the returned slots with the preceding slots,
* if available (non zero)
*/
for (i = index - 1;
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 &&
io_tlb_list[i]; i--)
io_tlb_list[i] = ++count;
if (index + nslots < ALIGN(index + 1, IO_TLB_SEGSIZE))
count = io_tlb_list[index + nslots];
else
count = 0;
io_tlb_used -= nslots;
/*
* Step 1: return the slots to the free list, merging the slots with
* superceeding slots
*/
for (i = index + nslots - 1; i >= index; i--) {
io_tlb_list[i] = ++count;
io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
}
/*
* Step 2: merge the returned slots with the preceding slots, if
* available (non zero)
*/
for (i = index - 1;
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 && io_tlb_list[i];
i--)
io_tlb_list[i] = ++count;
io_tlb_used -= nslots;
spin_unlock_irqrestore(&io_tlb_lock, flags);
}