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scsi: check that busses support the DMA API before setting dma parameters

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We'll start throwing warnings soon when dma_set_seg_boundary and
dma_set_max_seg_size are called on devices for buses that don't fully
support the DMA API.  Prepare for that by making the calls in the SCSI
midlayer conditional.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2024-08-22 06:56:31 +02:00
parent 833bd284a4
commit b5a73bf4d1
1 changed files with 9 additions and 2 deletions
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11
drivers/scsi/scsi_lib.c
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@ -1988,8 +1988,15 @@ void scsi_init_limits(struct Scsi_Host *shost, struct queue_limits *lim)
if (shost->no_highmem)
lim->features |= BLK_FEAT_BOUNCE_HIGH;
dma_set_seg_boundary(dev, shost->dma_boundary);
dma_set_max_seg_size(dev, shost->max_segment_size);
/*
* Propagate the DMA formation properties to the dma-mapping layer as
* a courtesy service to the LLDDs. This needs to check that the buses
* actually support the DMA API first, though.
*/
if (dev->dma_parms) {
dma_set_seg_boundary(dev, shost->dma_boundary);
dma_set_max_seg_size(dev, shost->max_segment_size);
}
}
EXPORT_SYMBOL_GPL(scsi_init_limits);