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[AUTOSEL,4.19,07/36] scsi: lpfc: fix remoteport access

Message ID 20181122195240.13123-7-sashal@kernel.org (mailing list archive)
State Not Applicable
Headers show
Series None | expand

Commit Message

Sasha Levin Nov. 22, 2018, 7:52 p.m. UTC 
From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit f8d294324598ec85bea2779512e48c94cbe4d7c6 ]

The addition of a spinlock in lpfc_debugfs_nodelist_data() introduced
a bug that lets us not skip NULL pointers correctly, as noticed by
gcc-8:

drivers/scsi/lpfc/lpfc_debugfs.c: In function 'lpfc_debugfs_nodelist_data.constprop':
drivers/scsi/lpfc/lpfc_debugfs.c:728:13: error: 'nrport' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   if (nrport->port_role & FC_PORT_ROLE_NVME_INITIATOR)

This changes the logic back to what it was, while keeping the added
spinlock.

Fixes: 9e210178267b ("scsi: lpfc: Synchronize access to remoteport via rport")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/lpfc/lpfc_debugfs.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c
index aec5b10a8c85..ca6c3982548d 100644
--- a/drivers/scsi/lpfc/lpfc_debugfs.c
+++ b/drivers/scsi/lpfc/lpfc_debugfs.c
@@ -700,6 +700,8 @@  lpfc_debugfs_nodelist_data(struct lpfc_vport *vport, char *buf, int size)
 		rport = lpfc_ndlp_get_nrport(ndlp);
 		if (rport)
 			nrport = rport->remoteport;
+		else
+			nrport = NULL;
 		spin_unlock(&phba->hbalock);
 		if (!nrport)
 			continue;