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

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

[Sasha Levin]

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(+)

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;
-- 
2.17.1

[PATCH AUTOSEL 4.19 08/36] scsi: hisi_sas: Remove set but not used variable 'dq_list'

[Sasha Levin]

From: YueHaibing <yuehaibing@huawei.com>

[ Upstream commit e34ff8edcae89922d187425ab0b82e6a039aa371 ]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/scsi/hisi_sas/hisi_sas_v1_hw.c: In function 'start_delivery_v1_hw':
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c:907:20: warning:
 variable 'dq_list' set but not used [-Wunused-but-set-variable]

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c: In function 'start_delivery_v2_hw':
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c:1671:20: warning:
 variable 'dq_list' set but not used [-Wunused-but-set-variable]

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c: In function 'start_delivery_v3_hw':
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c:889:20: warning:
 variable 'dq_list' set but not used [-Wunused-but-set-variable]

It never used since introduction in commit
fa222db0b036 ("scsi: hisi_sas: Don't lock DQ for complete task sending")

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 2 --
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 2 --
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 2 --
 3 files changed, 6 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
index 8f60f0e04599..410eccf0bc5e 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
@@ -904,11 +904,9 @@ static void start_delivery_v1_hw(struct hisi_sas_dq *dq)
 {
 	struct hisi_hba *hisi_hba = dq->hisi_hba;
 	struct hisi_sas_slot *s, *s1, *s2 = NULL;
-	struct list_head *dq_list;
 	int dlvry_queue = dq->id;
 	int wp;
 
-	dq_list = &dq->list;
 	list_for_each_entry_safe(s, s1, &dq->list, delivery) {
 		if (!s->ready)
 			break;
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 9c5c5a601332..1c4ea58da1ae 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -1666,11 +1666,9 @@ static void start_delivery_v2_hw(struct hisi_sas_dq *dq)
 {
 	struct hisi_hba *hisi_hba = dq->hisi_hba;
 	struct hisi_sas_slot *s, *s1, *s2 = NULL;
-	struct list_head *dq_list;
 	int dlvry_queue = dq->id;
 	int wp;
 
-	dq_list = &dq->list;
 	list_for_each_entry_safe(s, s1, &dq->list, delivery) {
 		if (!s->ready)
 			break;
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 08b503e274b8..687ff61bba9f 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -883,11 +883,9 @@ static void start_delivery_v3_hw(struct hisi_sas_dq *dq)
 {
 	struct hisi_hba *hisi_hba = dq->hisi_hba;
 	struct hisi_sas_slot *s, *s1, *s2 = NULL;
-	struct list_head *dq_list;
 	int dlvry_queue = dq->id;
 	int wp;
 
-	dq_list = &dq->list;
 	list_for_each_entry_safe(s, s1, &dq->list, delivery) {
 		if (!s->ready)
 			break;
-- 
2.17.1

[PATCH AUTOSEL 4.19 09/36] scsi: NCR5380: Return false instead of NULL

[Sasha Levin]

From: Finn Thain <fthain@telegraphics.com.au>

[ Upstream commit 96edebd6bb995f2acb7694bed6e01bf6f5a7b634 ]

I overlooked this statement when I recently converted the function result
type from struct scsi_cmnd * to bool. No change to object code.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/NCR5380.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 90ea0f5d9bdb..fbcbd6db371f 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -1190,7 +1190,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
 
 out:
 	if (!hostdata->selecting)
-		return NULL;
+		return false;
 	hostdata->selecting = NULL;
 	return cmd;
 }
-- 
2.17.1

Re: [PATCH AUTOSEL 4.19 09/36] scsi: NCR5380: Return false instead of NULL

[Finn Thain]

This patch is not relevant to any -stable branch. Please don't backport.

-- 

On Thu, 22 Nov 2018, Sasha Levin wrote:

> From: Finn Thain <fthain@telegraphics.com.au>
> 
> [ Upstream commit 96edebd6bb995f2acb7694bed6e01bf6f5a7b634 ]
> 
> I overlooked this statement when I recently converted the function result
> type from struct scsi_cmnd * to bool. No change to object code.
> 
> Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
>  drivers/scsi/NCR5380.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
> index 90ea0f5d9bdb..fbcbd6db371f 100644
> --- a/drivers/scsi/NCR5380.c
> +++ b/drivers/scsi/NCR5380.c
> @@ -1190,7 +1190,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
>  
>  out:
>  	if (!hostdata->selecting)
> -		return NULL;
> +		return false;
>  	hostdata->selecting = NULL;
>  	return cmd;
>  }
> 

Re: [PATCH AUTOSEL 4.19 09/36] scsi: NCR5380: Return false instead of NULL

[Sasha Levin]

On Fri, Nov 23, 2018 at 08:49:39AM +1100, Finn Thain wrote:
>
>This patch is not relevant to any -stable branch. Please don't backport.

Heh, I see why. I wonder why git applied it cleanly :/

Now dropped, thank you.