drv: always mask segment_size

The max_segment_size must be a multiple of PAGE_SIZE. So mask it with PAGE_MASK to avoid problems. Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

drv: always mask segment_size
The max_segment_size must be a multiple of PAGE_SIZE. So mask it with PAGE_MASK to avoid problems. Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
b316e4d7 · Federico Vaga · 095365df · b316e4d7
Commit b316e4d7 authored Sep 14, 2020 by Federico Vaga
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fa-dma.c kernel/fa-dma.c +1 -1

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--- a/kernel/fa-dma.c
+++ b/kernel/fa-dma.c
@@ -397,11 +397,11 @@ static int zfad_dma_prep_slave_sg(struct dma_chan *dchan,

 	max_segment_size = min(zfad_block->block->datalen + PAGE_SIZE, /* PAGE aligned */
 			       (size_t)dma_get_max_seg_size(dchan->device->dev));
-	max_segment_size &= PAGE_MASK; /* to make alloc_table happy */
 	/* Find something that fits in the [SW-]IOMMU */
 	do {
 		dev_dbg(&fa->pdev->dev, "DMA max segment %ld\n",
 			max_segment_size);
+		max_segment_size &= PAGE_MASK; /* to make alloc_table happy */
 		err = fa->sg_alloc_table_from_pages(&zfad_block->sgt, pages,
 						    nr_pages,
 						    offset_in_page(zfad_block->block->data),