[v2,14/14] mmc: queue: create dev->dma_parms before call dma_set_max_seg_size()

Commit Message

Bough Chen Dec. 3, 2019, 12:54 p.m. UTC

To make dma_set_max_seg_size() work, need to create dev->dma_parms.

Find this issue on i.MX8QM mek board, this platform config the
max_segment_size to 65535, but this dma_set_max_seg_size do not
actuall work, find sometimes the segment size is 65536, exceed
the hardware max segment limitation, trigger ADMA error.

Signed-off-by: Haibo Chen <[e-mail]>
---
 drivers/mmc/core/queue.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Patch

diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index 9edc08685e86..f74c28c58482 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -359,6 +359,7 @@  static const struct blk_mq_ops mmc_mq_ops = {
 static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
 {
 	struct mmc_host *host = card->host;
+	struct device *dev = mmc_dev(host);
 	unsigned block_size = 512;
 
 	blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
@@ -366,13 +367,12 @@  static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
 	if (mmc_can_erase(card))
 		mmc_queue_setup_discard(mq->queue, card);
 
-	if (!mmc_dev(host)->dma_mask || !*mmc_dev(host)->dma_mask)
+	if (!dev->dma_mask || !*dev->dma_mask)
 		blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
 	blk_queue_max_hw_sectors(mq->queue,
 		min(host->max_blk_count, host->max_req_size / 512));
 	if (host->can_dma_map_merge)
-		WARN(!blk_queue_can_use_dma_map_merging(mq->queue,
-							mmc_dev(host)),
+		WARN(!blk_queue_can_use_dma_map_merging(mq->queue, dev),
 		     "merging was advertised but not possible");
 	blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
 
@@ -389,7 +389,8 @@  static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
 		blk_queue_max_segment_size(mq->queue,
 			round_down(host->max_seg_size, block_size));
 
-	dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
+	dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), GFP_KERNEL);
+	dma_set_max_seg_size(dev, queue_max_segment_size(mq->queue));
 
 	INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
 	INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);