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 3cba7bfba296..30199663c7d8 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 e95408314078..36ec3901cfd4 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c @@ -3155,6 +3155,7 @@ 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 af09bd282cb9..313248c7bab9 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