linux-kernel - [PATCH] [SCSI] libsas: remove expander from dev list on error

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Message-ID: <1311747048.72460.YahooMailNeo@web31810.mail.mud.yahoo.com>
Date:	Tue, 26 Jul 2011 23:10:48 -0700 (PDT)
From:	Luben Tuikov <ltuikov@...oo.com>
To:	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"JBottomley@...allels.com" <JBottomley@...allels.com>,
	Jack Wang <jack_wang@...sh.com>
Subject: [PATCH] [SCSI] libsas: remove expander from dev list on error

If expander discovery fails (sas_discover_expander()),
remove the expander from the port device list
(sas_ex_discover_expander()), before freeing it. Else
the list is corrupted and, e.g., when we attempt to send
SMP commands to other devices, the kernel oopses.

Signed-off-by: Luben Tuikov <ltuikov@...oo.com>
Reviewed-by: Jack Wang <jack_wang@...sh.com>
---
 drivers/scsi/libsas/sas_expander.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 874e29d..f84084b 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -849,6 +849,9 @@ static struct domain_device *sas_ex_discover_expander(
 
        res = sas_discover_expander(child);
        if (res) {
+               spin_lock_irq(&parent->port->dev_list_lock);
+               list_del(&child->dev_list_node);
+               spin_unlock_irq(&parent->port->dev_list_lock);
                kfree(child);
                return NULL;
        }
-- 
1.7.2.2.165.gbc382
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