linux-kernel - [PATCH v2 06/11] scsi: scsi_debug: Drop scsi_debug_bus

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Message-Id: <20230313084505.1487337-7-john.g.garry@oracle.com>
Date:   Mon, 13 Mar 2023 08:45:01 +0000
From:   John Garry <john.g.garry@...cle.com>
To:     jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, bvanassche@....org,
        linux-kernel@...r.kernel.org, dgilbert@...erlog.com,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH v2 06/11] scsi: scsi_debug: Drop scsi_debug_bus_reset() NULL pointer checks

The checks for SCSI cmnd, SCSI device, and SCSI host are unnecessary, so
drop them. Likewise, drop the NULL check for sdbg_host.

The only caller is scsi_try_bus_reset() -> eh_bus_reset_handler(),
and there those pointers cannot be NULL.

Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 drivers/scsi/scsi_debug.c | 26 ++++++++------------------
 1 file changed, 8 insertions(+), 18 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 6364d6f08861..749358b48335 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -5412,34 +5412,24 @@ static int scsi_debug_target_reset(struct scsi_cmnd *SCpnt)
 
 static int scsi_debug_bus_reset(struct scsi_cmnd *SCpnt)
 {
-	struct sdebug_host_info *sdbg_host;
+	struct scsi_device *sdp = SCpnt->device;
+	struct sdebug_host_info *sdbg_host = shost_to_sdebug_host(sdp->host);
 	struct sdebug_dev_info *devip;
-	struct scsi_device *sdp;
-	struct Scsi_Host *hp;
 	int k = 0;
 
 	++num_bus_resets;
-	if (!(SCpnt && SCpnt->device))
-		goto lie;
-	sdp = SCpnt->device;
+
 	if (SDEBUG_OPT_ALL_NOISE & sdebug_opts)
 		sdev_printk(KERN_INFO, sdp, "%s\n", __func__);
-	hp = sdp->host;
-	if (hp) {
-		sdbg_host = shost_to_sdebug_host(hp);
-		if (sdbg_host) {
-			list_for_each_entry(devip,
-					    &sdbg_host->dev_info_list,
-					    dev_list) {
-				set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
-				++k;
-			}
-		}
+
+	list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
+		set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
+		++k;
 	}
+
 	if (SDEBUG_OPT_RESET_NOISE & sdebug_opts)
 		sdev_printk(KERN_INFO, sdp,
 			    "%s: %d device(s) found in host\n", __func__, k);
-lie:
 	return SUCCESS;
 }
 
-- 
2.35.3