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From:   linan666@huaweicloud.com
To:     axboe@kernel.dk, vishal.l.verma@intel.com, dan.j.williams@intel.com
Cc:     linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        linan122@huawei.com, yukuai3@huawei.com, yi.zhang@huawei.com,
        houtao1@huawei.com, yangerkun@huawei.com
Subject: [PATCH 01/10] block/badblocks: only set bb->changed when badblocks changes
Date:   Fri, 28 Apr 2023 16:50:11 +0800
Message-Id: <20230428085020.2283981-2-linan666@huaweicloud.com>
In-Reply-To: <20230428085020.2283981-1-linan666@huaweicloud.com>
References: <20230428085020.2283981-1-linan666@huaweicloud.com>
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From: Li Nan <linan122@huawei.com>

bb->changed and unacked_exist is set and badblocks_update_acked() is
involked even if no badblocks changes in badblocks_set(). Only update
them when badblocks changes.

Fixes: 9e0e252a048b ("badblocks: Add core badblock management code")
Signed-off-by: Li Nan <linan122@huawei.com>
---
 block/badblocks.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/block/badblocks.c b/block/badblocks.c
index 1b4caa42c5f1..7e6ebe2ac12c 100644
--- a/block/badblocks.c
+++ b/block/badblocks.c
@@ -166,6 +166,7 @@ int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
 	int lo, hi;
 	int rv = 0;
 	unsigned long flags;
+	bool changed = false;
 
 	if (bb->shift < 0)
 		/* badblocks are disabled */
@@ -229,6 +230,7 @@ int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
 				s = a + BB_MAX_LEN;
 			}
 			sectors = e - s;
+			changed = true;
 		}
 	}
 	if (sectors && hi < bb->count) {
@@ -259,6 +261,7 @@ int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
 			sectors = e - s;
 			lo = hi;
 			hi++;
+			changed = true;
 		}
 	}
 	if (sectors == 0 && hi < bb->count) {
@@ -277,6 +280,7 @@ int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
 			memmove(p + hi, p + hi + 1,
 				(bb->count - hi - 1) * 8);
 			bb->count--;
+			changed = true;
 		}
 	}
 	while (sectors) {
@@ -299,14 +303,17 @@ int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
 			p[hi] = BB_MAKE(s, this_sectors, acknowledged);
 			sectors -= this_sectors;
 			s += this_sectors;
+			changed = true;
 		}
 	}
 
-	bb->changed = true;
-	if (!acknowledged)
-		bb->unacked_exist = true;
-	else
-		badblocks_update_acked(bb);
+	if (changed) {
+		bb->changed = changed;
+		if (!acknowledged)
+			bb->unacked_exist = true;
+		else
+			badblocks_update_acked(bb);
+	}
 	write_sequnlock_irqrestore(&bb->lock, flags);
 
 	return rv;
-- 
2.31.1