linux-kernel - [PATCH 4.4 088/159] scsi: libsas: always unregister the old device if going to discover new

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Message-Id: <20191122100810.346407112@linuxfoundation.org>
Date:   Fri, 22 Nov 2019 11:27:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jason Yan <yanaijie@...wei.com>,
        chenxiang <chenxiang66@...ilicon.com>,
        John Garry <john.garry@...wei.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Ewan Milne <emilne@...hat.com>, Christoph Hellwig <hch@....de>,
        Tomas Henzl <thenzl@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Hannes Reinecke <hare@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 088/159] scsi: libsas: always unregister the old device if going to discover new

From: Jason Yan <yanaijie@...wei.com>

[ Upstream commit 32c850bf587f993b2620b91e5af8a64a7813f504 ]

If we went into sas_rediscover_dev() the attached_sas_addr was already insured
not to be zero. So it's unnecessary to check if the attached_sas_addr is zero.

And although if the sas address is not changed, we always have to unregister
the old device when we are going to register a new one. We cannot just leave
the device there and bring up the new.

Signed-off-by: Jason Yan <yanaijie@...wei.com>
CC: chenxiang <chenxiang66@...ilicon.com>
CC: John Garry <john.garry@...wei.com>
CC: Johannes Thumshirn <jthumshirn@...e.de>
CC: Ewan Milne <emilne@...hat.com>
CC: Christoph Hellwig <hch@....de>
CC: Tomas Henzl <thenzl@...hat.com>
CC: Dan Williams <dan.j.williams@...el.com>
CC: Hannes Reinecke <hare@...e.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/libsas/sas_expander.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 400eee9d77832..d44f18f773c0f 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -2049,14 +2049,11 @@ static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
 		return res;
 	}
 
-	/* delete the old link */
-	if (SAS_ADDR(phy->attached_sas_addr) &&
-	    SAS_ADDR(sas_addr) != SAS_ADDR(phy->attached_sas_addr)) {
-		SAS_DPRINTK("ex %016llx phy 0x%x replace %016llx\n",
-			    SAS_ADDR(dev->sas_addr), phy_id,
-			    SAS_ADDR(phy->attached_sas_addr));
-		sas_unregister_devs_sas_addr(dev, phy_id, last);
-	}
+	/* we always have to delete the old device when we went here */
+	SAS_DPRINTK("ex %016llx phy 0x%x replace %016llx\n",
+		    SAS_ADDR(dev->sas_addr), phy_id,
+		    SAS_ADDR(phy->attached_sas_addr));
+	sas_unregister_devs_sas_addr(dev, phy_id, last);
 
 	return sas_discover_new(dev, phy_id);
 }
-- 
2.20.1