[PATCH AUTOSEL 5.12 093/102] scsi: libsas: Add LUN number check in .slave_alloc callback

Sasha Levin
2021-07-14T19:48:04Z

From: Yufen Yu <yuyufen@huawei.com>

[ Upstream commit 49da96d77938db21864dae6b7736b71e96c1d203 ]

Offlining a SATA device connected to a hisi SAS controller and then
scanning the host will result in detecting 255 non-existent devices:

# lsscsi
[2:0:0:0] disk ATA Samsung SSD 860 2B6Q /dev/sda
[2:0:1:0] disk ATA WDC WD2003FYYS-3 1D01 /dev/sdb
[2:0:2:0] disk SEAGATE ST600MM0006 B001 /dev/sdc
# echo "offline" > /sys/block/sdb/device/state
# echo "- - -" > /sys/class/scsi_host/host2/scan
# lsscsi
[2:0:0:0] disk ATA Samsung SSD 860 2B6Q /dev/sda
[2:0:1:0] disk ATA WDC WD2003FYYS-3 1D01 /dev/sdb
[2:0:1:1] disk ATA WDC WD2003FYYS-3 1D01 /dev/sdh
...
[2:0:1:255] disk ATA WDC WD2003FYYS-3 1D01 /dev/sdjb

After a REPORT LUN command issued to the offline device fails, the SCSI
midlayer tries to do a sequential scan of all devices whose LUN number is
not 0. However, SATA does not support LUN numbers at all.

Introduce a generic sas_slave_alloc() handler which will return -ENXIO for
SATA devices if the requested LUN number is larger than 0 and make libsas
drivers use this function as their .slave_alloc callback.

Link: https://lore.kernel.org/r/20210622034037.1467088-1-yuyufen@huawei.com
Reported-by: Wu Bo <wubo40@huawei.com>
Suggested-by: John Garry <john.garry@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/aic94xx/aic94xx_init.c | 1 +
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 1 +
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 1 +
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 1 +
drivers/scsi/isci/init.c | 1 +
drivers/scsi/libsas/sas_scsi_host.c | 9 +++++++++
drivers/scsi/mvsas/mv_init.c | 1 +
drivers/scsi/pm8001/pm8001_init.c | 1 +
8 files changed, 16 insertions(+)

diff --git a/drivers/scsi/aic94xx/aic94xx_init.c b/drivers/scsi/aic94xx/aic94xx_init.c
index a195bfe9eccc..7a78606598c4 100644
--- a/drivers/scsi/aic94xx/aic94xx_init.c
+++ b/drivers/scsi/aic94xx/aic94xx_init.c
@@ -53,6 +53,7 @@ static struct scsi_host_template aic94xx_sht = {
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
+ .slave_alloc = sas_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
#ifdef CONFIG_COMPAT
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
index 3e359ac752fd..15eaac3a4eb6 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
@@ -1771,6 +1771,7 @@ static struct scsi_host_template sht_v1_hw = {
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
+ .slave_alloc = sas_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
#ifdef CONFIG_COMPAT
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 46f60fc2a069..9df1639ffa65 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -3584,6 +3584,7 @@ static struct scsi_host_template sht_v2_hw = {
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
+ .slave_alloc = sas_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
#ifdef CONFIG_COMPAT
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index b21246b1ba99..de23213945a7 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -3147,6 +3147,7 @@ static struct scsi_host_template sht_v3_hw = {
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
+ .slave_alloc = sas_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
#ifdef CONFIG_COMPAT
diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index c452849e7bb4..ffd33e5decae 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -167,6 +167,7 @@ static struct scsi_host_template isci_sht = {
.eh_abort_handler = sas_eh_abort_handler,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
+ .slave_alloc = sas_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
#ifdef CONFIG_COMPAT
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 1bf939818c98..ee44a0d7730b 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -911,6 +911,14 @@ void sas_task_abort(struct sas_task *task)
blk_abort_request(sc->request);
}

+int sas_slave_alloc(struct scsi_device *sdev)
+{
+ if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun)
+ return -ENXIO;
+
+ return 0;
+}
+
void sas_target_destroy(struct scsi_target *starget)
{
struct domain_device *found_dev = starget->hostdata;
@@ -957,5 +965,6 @@ EXPORT_SYMBOL_GPL(sas_task_abort);
EXPORT_SYMBOL_GPL(sas_phy_reset);
EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
+EXPORT_SYMBOL_GPL(sas_slave_alloc);
EXPORT_SYMBOL_GPL(sas_target_destroy);
EXPORT_SYMBOL_GPL(sas_ioctl);
diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
index 6aa2697c4a15..b03c0f35d7b0 100644
--- a/drivers/scsi/mvsas/mv_init.c
+++ b/drivers/scsi/mvsas/mv_init.c
@@ -46,6 +46,7 @@ static struct scsi_host_template mvs_sht = {
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
+ .slave_alloc = sas_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
#ifdef CONFIG_COMPAT
diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
index 4f3ec2bba8c9..18ea2a3e6b76 100644
--- a/drivers/scsi/pm8001/pm8001_init.c
+++ b/drivers/scsi/pm8001/pm8001_init.c
@@ -101,6 +101,7 @@ static struct scsi_host_template pm8001_sht = {
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
+ .slave_alloc = sas_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
#ifdef CONFIG_COMPAT
--
2.30.2