From: Mahesh Rajashekhara mahesh.rajashekhara@microchip.com
[ Upstream commit fb4cece17b4583f55b34a8538e27a4adc833c9d4 ]
Correct rescan flag race condition.
Multiple conditions are being evaluated before notifying OS to do a rescan.
Driver will skip rescanning the device if any one of the following conditions are met:
- Devices that have not yet been added to the OS or devices that have been removed.
- Devices which are already marked for removal or in the phase of removal.
Under very rare conditions, after logical volume size expansion, the OS still sees the size of the logical volume which was before expansion.
The rescan flag in the driver is used to signal the need for a logical volume rescan. A race condition can occur in the driver, and it leads to one thread overwriting the flag inadvertently. As a result, driver is not notifying the OS SML to rescan the logical volume.
Move device->rescan update into new function pqi_mark_volumes_for_rescan() and protect with a spin lock.
Move check for device->rescan into new function pqi_volume_rescan_needed() and protect function call with a spin_lock.
Reviewed-by: Scott Teel scott.teel@microchip.com Reviewed-by: Scott Benesh scott.benesh@microchip.com Reviewed-by: Mike McGowen mike.mcgowen@microchip.com Reviewed-by: Kevin Barnett kevin.barnett@microchip.com Co-developed-by: Murthy Bhat Murthy.Bhat@microchip.com Signed-off-by: Murthy Bhat Murthy.Bhat@microchip.com Signed-off-by: Mahesh Rajashekhara mahesh.rajashekhara@microchip.com Signed-off-by: Don Brace don.brace@microchip.com Link: https://lore.kernel.org/r/20231219193653.277553-3-don.brace@microchip.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/smartpqi/smartpqi.h | 1 - drivers/scsi/smartpqi/smartpqi_init.c | 43 ++++++++++++++++++++++----- 2 files changed, 36 insertions(+), 8 deletions(-)
diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h index 041940183516..cdedc271857a 100644 --- a/drivers/scsi/smartpqi/smartpqi.h +++ b/drivers/scsi/smartpqi/smartpqi.h @@ -1347,7 +1347,6 @@ struct pqi_ctrl_info { bool controller_online; bool block_requests; bool scan_blocked; - u8 logical_volume_rescan_needed : 1; u8 inbound_spanning_supported : 1; u8 outbound_spanning_supported : 1; u8 pqi_mode_enabled : 1; diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c index d56201120087..081bb2c09806 100644 --- a/drivers/scsi/smartpqi/smartpqi_init.c +++ b/drivers/scsi/smartpqi/smartpqi_init.c @@ -2093,8 +2093,6 @@ static void pqi_scsi_update_device(struct pqi_ctrl_info *ctrl_info, if (existing_device->devtype == TYPE_DISK) { existing_device->raid_level = new_device->raid_level; existing_device->volume_status = new_device->volume_status; - if (ctrl_info->logical_volume_rescan_needed) - existing_device->rescan = true; memset(existing_device->next_bypass_group, 0, sizeof(existing_device->next_bypass_group)); if (!pqi_raid_maps_equal(existing_device->raid_map, new_device->raid_map)) { kfree(existing_device->raid_map); @@ -2164,6 +2162,20 @@ static inline void pqi_init_device_tmf_work(struct pqi_scsi_dev *device) INIT_WORK(&tmf_work->work_struct, pqi_tmf_worker); }
+static inline bool pqi_volume_rescan_needed(struct pqi_scsi_dev *device) +{ + if (pqi_device_in_remove(device)) + return false; + + if (device->sdev == NULL) + return false; + + if (!scsi_device_online(device->sdev)) + return false; + + return device->rescan; +} + static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info, struct pqi_scsi_dev *new_device_list[], unsigned int num_new_devices) { @@ -2284,9 +2296,13 @@ static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info, if (device->sdev && device->queue_depth != device->advertised_queue_depth) { device->advertised_queue_depth = device->queue_depth; scsi_change_queue_depth(device->sdev, device->advertised_queue_depth); - if (device->rescan) { - scsi_rescan_device(device->sdev); + spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags); + if (pqi_volume_rescan_needed(device)) { device->rescan = false; + spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags); + scsi_rescan_device(device->sdev); + } else { + spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags); } } } @@ -2308,8 +2324,6 @@ static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info, } }
- ctrl_info->logical_volume_rescan_needed = false; - }
static inline bool pqi_is_supported_device(struct pqi_scsi_dev *device) @@ -3702,6 +3716,21 @@ static bool pqi_ofa_process_event(struct pqi_ctrl_info *ctrl_info, return ack_event; }
+static void pqi_mark_volumes_for_rescan(struct pqi_ctrl_info *ctrl_info) +{ + unsigned long flags; + struct pqi_scsi_dev *device; + + spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags); + + list_for_each_entry(device, &ctrl_info->scsi_device_list, scsi_device_list_entry) { + if (pqi_is_logical_device(device) && device->devtype == TYPE_DISK) + device->rescan = true; + } + + spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags); +} + static void pqi_disable_raid_bypass(struct pqi_ctrl_info *ctrl_info) { unsigned long flags; @@ -3742,7 +3771,7 @@ static void pqi_event_worker(struct work_struct *work) ack_event = true; rescan_needed = true; if (event->event_type == PQI_EVENT_TYPE_LOGICAL_DEVICE) - ctrl_info->logical_volume_rescan_needed = true; + pqi_mark_volumes_for_rescan(ctrl_info); else if (event->event_type == PQI_EVENT_TYPE_AIO_STATE_CHANGE) pqi_disable_raid_bypass(ctrl_info); }