linux-kernel - [PATCH 5.1 36/70] memstick: mspro_block: Fix an error code in mspro_block_issue

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Date:   Sun,  9 Jun 2019 18:41:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 5.1 36/70] memstick: mspro_block: Fix an error code in mspro_block_issue_req()

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 61009f82a93f7c0b33cd9b3b263a6ab48f8b49d4 upstream.

We accidentally changed the error code from -EAGAIN to 1 when we did the
blk-mq conversion.

Maybe a contributing factor to this mistake is that it wasn't obvious
that the "while (chunk) {" condition is always true.  I have cleaned
that up as well.

Fixes: d0be12274dad ("mspro_block: convert to blk-mq")
Cc: stable@...r.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/memstick/core/mspro_block.c |   13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -694,13 +694,13 @@ static void h_mspro_block_setup_cmd(stru
 
 /*** Data transfer ***/
 
-static int mspro_block_issue_req(struct memstick_dev *card, bool chunk)
+static int mspro_block_issue_req(struct memstick_dev *card)
 {
 	struct mspro_block_data *msb = memstick_get_drvdata(card);
 	u64 t_off;
 	unsigned int count;
 
-	while (chunk) {
+	while (true) {
 		msb->current_page = 0;
 		msb->current_seg = 0;
 		msb->seg_count = blk_rq_map_sg(msb->block_req->q,
@@ -709,6 +709,7 @@ static int mspro_block_issue_req(struct
 
 		if (!msb->seg_count) {
 			unsigned int bytes = blk_rq_cur_bytes(msb->block_req);
+			bool chunk;
 
 			chunk = blk_update_request(msb->block_req,
 							BLK_STS_RESOURCE,
@@ -718,7 +719,7 @@ static int mspro_block_issue_req(struct
 			__blk_mq_end_request(msb->block_req,
 						BLK_STS_RESOURCE);
 			msb->block_req = NULL;
-			break;
+			return -EAGAIN;
 		}
 
 		t_off = blk_rq_pos(msb->block_req);
@@ -735,8 +736,6 @@ static int mspro_block_issue_req(struct
 		memstick_new_req(card->host);
 		return 0;
 	}
-
-	return 1;
 }
 
 static int mspro_block_complete_req(struct memstick_dev *card, int error)
@@ -779,7 +778,7 @@ static int mspro_block_complete_req(stru
 		chunk = blk_update_request(msb->block_req,
 				errno_to_blk_status(error), t_len);
 		if (chunk) {
-			error = mspro_block_issue_req(card, chunk);
+			error = mspro_block_issue_req(card);
 			if (!error)
 				goto out;
 		} else {
@@ -849,7 +848,7 @@ static blk_status_t mspro_queue_rq(struc
 	msb->block_req = bd->rq;
 	blk_mq_start_request(bd->rq);
 
-	if (mspro_block_issue_req(card, true))
+	if (mspro_block_issue_req(card))
 		msb->block_req = NULL;
 
 	spin_unlock_irq(&msb->q_lock);