4.19-stable review patch. If anyone has any objections, please let me know.
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[ 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(+)
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;