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swiotlb: move slot allocation explanation comment where it belongs

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Move the comment down in front of the loop that actually sets the list
member of struct io_tlb_slot to zero.

Fixes: 26a7e09478 ("swiotlb: refactor swiotlb_tbl_map_single")
Signed-off-by: Petr Tesarik <petr.tesarik.ext@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Petr Tesarik 2023-08-02 18:30:34 +02:00 committed by Christoph Hellwig
parent 1395706a14
commit f94cb36e76
1 changed files with 5 additions and 5 deletions
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10
kernel/dma/swiotlb.c
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@ -1018,11 +1018,6 @@ static int swiotlb_area_find_slots(struct device *dev, struct io_tlb_pool *pool,
continue;
}
/*
* If we find a slot that indicates we have 'nslots' number of
* contiguous buffers, we allocate the buffers from that slot
* and mark the entries as '0' indicating unavailable.
*/
if (!iommu_is_span_boundary(slot_index, nslots,
nr_slots(tbl_dma_addr),
max_slots)) {
@ -1038,6 +1033,11 @@ static int swiotlb_area_find_slots(struct device *dev, struct io_tlb_pool *pool,
return -1;
found:
/*
* If we find a slot that indicates we have 'nslots' number of
* contiguous buffers, we allocate the buffers from that slot onwards
* and set the list of free entries to '0' indicating unavailable.
*/
for (i = slot_index; i < slot_index + nslots; i++) {
pool->slots[i].list = 0;
pool->slots[i].alloc_size = alloc_size - (offset +