[PATCH 2/6] nvme-apple: Don't set a DMA direction for commands without a data transfer

[Sven Peter]

Setting the DMA direction for commands that don't do any transfer likely
triggered the PRP NULL check for which we needed a chicken bit. That bit
has disappeared starting with macOS 15 so let's just do this correctly
instead.

Fixes: 5bd2927aceba ("nvme-apple: Add initial Apple SoC NVMe driver")
Signed-off-by: Sven Peter <sven at kernel.org>
---
 drivers/nvme/host/apple.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c
index 321502847a2c..f134b5ffb774 100644
--- a/drivers/nvme/host/apple.c
+++ b/drivers/nvme/host/apple.c
@@ -324,7 +324,9 @@ static void apple_nvme_submit_cmd_t8103(struct apple_nvme_queue *q,
 	tcb->length = cmd->rw.length;
 	tcb->command_id = tag;
 
-	if (nvme_is_write(cmd))
+	if (!cmd->common.dptr.prp1)
+		tcb->dma_flags = 0;
+	else if (nvme_is_write(cmd))
 		tcb->dma_flags = APPLE_ANS_TCB_DMA_TO_DEVICE;
 	else
 		tcb->dma_flags = APPLE_ANS_TCB_DMA_FROM_DEVICE;

-- 
2.55.0