linux-kernel - [PATCH v3 1/2] scsi: core: cleanup scsi_dev_queue

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Message-ID: <20231018113746.1940197-2-haowenchao2@huawei.com>
Date:   Wed, 18 Oct 2023 19:37:45 +0800
From:   Wenchao Hao <haowenchao2@...wei.com>
To:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        Bart Van Assche <bvanassche@....org>
CC:     "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <louhongxiang@...wei.com>, Wenchao Hao <haowenchao2@...wei.com>
Subject: [PATCH v3 1/2] scsi: core: cleanup scsi_dev_queue_ready()

This is just a cleanup for scsi_dev_queue_ready() to avoid
redundant goto and if statement, it did not change the origin
logic.

Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>
---
 drivers/scsi/scsi_lib.c | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index aca57c3ab626..cf3864f72093 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1251,28 +1251,26 @@ static inline int scsi_dev_queue_ready(struct request_queue *q,
 	int token;
 
 	token = sbitmap_get(&sdev->budget_map);
-	if (atomic_read(&sdev->device_blocked)) {
-		if (token < 0)
-			goto out;
+	if (token < 0)
+		return -1;
 
-		if (scsi_device_busy(sdev) > 1)
-			goto out_dec;
+	if (!atomic_read(&sdev->device_blocked))
+		return token;
 
-		/*
-		 * unblock after device_blocked iterates to zero
-		 */
-		if (atomic_dec_return(&sdev->device_blocked) > 0)
-			goto out_dec;
-		SCSI_LOG_MLQUEUE(3, sdev_printk(KERN_INFO, sdev,
-				   "unblocking device at zero depth\n"));
+	/*
+	 * Only unblock if no other commands are pending and
+	 * if device_blocked has decreased to zero
+	 */
+	if (scsi_device_busy(sdev) > 1 ||
+	    atomic_dec_return(&sdev->device_blocked) > 0) {
+		sbitmap_put(&sdev->budget_map, token);
+		return -1;
 	}
 
+	SCSI_LOG_MLQUEUE(3, sdev_printk(KERN_INFO, sdev,
+			 "unblocking device at zero depth\n"));
+
 	return token;
-out_dec:
-	if (token >= 0)
-		sbitmap_put(&sdev->budget_map, token);
-out:
-	return -1;
 }
 
 /*
-- 
2.32.0