[PATCH] block, nvme: Increase max segments parameter setting value

From: Tokunori Ikegami <ikegami.t@gmail.com>
To: linux-block@vger.kernel.org
Cc: Tokunori Ikegami <ikegami.t@gmail.com>, linux-nvme@lists.infradead.org
Subject: [PATCH] block, nvme: Increase max segments parameter setting value
Date: Tue, 24 Mar 2020 03:23:24 +0900	[thread overview]
Message-ID: <20200323182324.3243-1-ikegami.t@gmail.com> (raw)

Currently data length can be specified as UINT_MAX but failed.
This is caused by the max segments parameter limit set as USHRT_MAX.
To resolve this issue change to increase the value limit range.

Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>
Cc: linux-block@vger.kernel.org
Cc: linux-nvme@lists.infradead.org
---
 block/blk-settings.c     | 2 +-
 drivers/nvme/host/core.c | 2 +-
 include/linux/blkdev.h   | 7 ++++---
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index c8eda2e7b91e..ed40bda573c2 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -266,7 +266,7 @@ EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors);
  *    Enables a low level driver to set an upper limit on the number of
  *    hw data segments in a request.
  **/
-void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments)
+void blk_queue_max_segments(struct request_queue *q, unsigned int max_segments)
 {
 	if (!max_segments) {
 		max_segments = 1;
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index a4d8c90ee7cc..2b48aab0969e 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2193,7 +2193,7 @@ static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
 
 		max_segments = min_not_zero(max_segments, ctrl->max_segments);
 		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
-		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
+		blk_queue_max_segments(q, min_t(u32, max_segments, UINT_MAX));
 	}
 	if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
 	    is_power_of_2(ctrl->max_hw_sectors))
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f629d40c645c..4f4224e20c28 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -338,8 +338,8 @@ struct queue_limits {
 	unsigned int		max_write_zeroes_sectors;
 	unsigned int		discard_granularity;
 	unsigned int		discard_alignment;
+	unsigned int		max_segments;
 
-	unsigned short		max_segments;
 	unsigned short		max_integrity_segments;
 	unsigned short		max_discard_segments;
 
@@ -1067,7 +1067,8 @@ extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
 extern void blk_queue_bounce_limit(struct request_queue *, u64);
 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
-extern void blk_queue_max_segments(struct request_queue *, unsigned short);
+extern void blk_queue_max_segments(struct request_queue *q,
+				   unsigned int max_segments);
 extern void blk_queue_max_discard_segments(struct request_queue *,
 		unsigned short);
 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
@@ -1276,7 +1277,7 @@ static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
 	return q->limits.max_hw_sectors;
 }
 
-static inline unsigned short queue_max_segments(const struct request_queue *q)
+static inline unsigned int queue_max_segments(const struct request_queue *q)
 {
 	return q->limits.max_segments;
 }
-- 
2.17.1

