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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Mike Snitzer <snitzer@redhat.com>,
        Christoph Hellwig <hch@lst.de>, Xiao Ni <xni@redhat.com>,
        Mariusz Dabrowski <mariusz.dabrowski@intel.com>,
        Rui Salvaterra <rsalvaterra@gmail.com>,
        Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>,
        Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Subject: [PATCH 4.19 53/55] block: cleanup __blkdev_issue_discard()
Date:   Thu, 30 Jan 2020 19:39:34 +0100
Message-Id: <20200130183618.023559040@linuxfoundation.org>
In-Reply-To: <20200130183608.563083888@linuxfoundation.org>
References: <20200130183608.563083888@linuxfoundation.org>
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From: Ming Lei <ming.lei@redhat.com>

commit ba5d73851e71847ba7f7f4c27a1a6e1f5ab91c79 upstream.

Cleanup __blkdev_issue_discard() a bit:

- remove local variable of 'end_sect'
- remove code block of 'fail'

Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Xiao Ni <xni@redhat.com>
Cc: Mariusz Dabrowski <mariusz.dabrowski@intel.com>
Tested-by: Rui Salvaterra <rsalvaterra@gmail.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 block/blk-lib.c |   23 ++++++-----------------
 1 file changed, 6 insertions(+), 17 deletions(-)

--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -52,15 +52,12 @@ int __blkdev_issue_discard(struct block_
 	if ((sector | nr_sects) & bs_mask)
 		return -EINVAL;
 
-	while (nr_sects) {
-		unsigned int req_sects = nr_sects;
-		sector_t end_sect;
-
-		if (!req_sects)
-			goto fail;
-		req_sects = min(req_sects, bio_allowed_max_sectors(q));
+	if (!nr_sects)
+		return -EINVAL;
 
-		end_sect = sector + req_sects;
+	while (nr_sects) {
+		unsigned int req_sects = min_t(unsigned int, nr_sects,
+				bio_allowed_max_sectors(q));
 
 		bio = next_bio(bio, 0, gfp_mask);
 		bio->bi_iter.bi_sector = sector;
@@ -68,8 +65,8 @@ int __blkdev_issue_discard(struct block_
 		bio_set_op_attrs(bio, op, 0);
 
 		bio->bi_iter.bi_size = req_sects << 9;
+		sector += req_sects;
 		nr_sects -= req_sects;
-		sector = end_sect;
 
 		/*
 		 * We can loop for a long time in here, if someone does
@@ -82,14 +79,6 @@ int __blkdev_issue_discard(struct block_
 
 	*biop = bio;
 	return 0;
-
-fail:
-	if (bio) {
-		submit_bio_wait(bio);
-		bio_put(bio);
-	}
-	*biop = NULL;
-	return -EOPNOTSUPP;
 }
 EXPORT_SYMBOL(__blkdev_issue_discard);