diff options
| author | Christoph Hellwig <hch@lst.de> | 2024-08-22 07:56:31 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2024-08-29 07:22:12 +0300 |
| commit | b5a73bf4d1de95e620bf5f592557b81f71c76f0e (patch) | |
| tree | ccd96b9293be16fb7fe882213e22898c456c092e /drivers/scsi | |
| parent | 833bd284a45448f04ab9fcd4fdf7ef594d458eed (diff) | |
| download | linux-b5a73bf4d1de95e620bf5f592557b81f71c76f0e.tar.xz | |
scsi: check that busses support the DMA API before setting dma parameters
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>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 3958a6d14bf4..7f0394c44920 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -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); |