[PATCH v3 8/9] scsi: core: Set BLK_SUB_PAGE_SEGMENTS for small max_segment_size values

[Bart Van Assche <bvanassche@xxxxxxx>]

The block layer only accepts max_segment_size values smaller than the
page size if the QUEUE_FLAG_SUB_PAGE_SEGMENTS flag is set. Hence this
patch.

Cc: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
Cc: Kiwoong Kim <kwmad.kim@xxxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
 drivers/scsi/scsi_lib.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 9ed1ebcb7443..91f2e7f787d8 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1876,6 +1876,9 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
 {
 	struct device *dev = shost->dma_dev;
 
+	if (shost->max_segment_size && shost->max_segment_size < PAGE_SIZE)
+		blk_queue_flag_set(QUEUE_FLAG_SUB_PAGE_SEGMENTS, q);
+
 	/*
 	 * this limit is imposed by hardware restrictions
 	 */