[PATCH V2 01/36] smartpqi: correct remove scsi devices

[Don Brace]

From: Kevin Barnett <kevin.barn...@microsemi.com>

correct a problem caused by holding a spinlock during device deletion.

Reviewed-by: Scott Benesh <scott.ben...@microsemi.com>
Reviewed-by: Scott Teel <scott.t...@microsemi.com>
Signed-off-by: Kevin Barnett <kevin.barn...@microsemi.com>
Signed-off-by: Don Brace <don.br...@microsemi.com>
---
 drivers/scsi/smartpqi/smartpqi_init.c |   20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c 
b/drivers/scsi/smartpqi/smartpqi_init.c
index 657ad15..dd00c69 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -1823,19 +1823,25 @@ static void pqi_remove_all_scsi_devices(struct 
pqi_ctrl_info *ctrl_info)
 {
        unsigned long flags;
        struct pqi_scsi_dev *device;
-       struct pqi_scsi_dev *next;
 
-       spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
+       while (1) {
+               spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
+
+               device = list_first_entry_or_null(&ctrl_info->scsi_device_list,
+                       struct pqi_scsi_dev, scsi_device_list_entry);
+               if (device)
+                       list_del(&device->scsi_device_list_entry);
+
+               spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock,
+                       flags);
+
+               if (!device)
+                       break;
 
-       list_for_each_entry_safe(device, next, &ctrl_info->scsi_device_list,
-               scsi_device_list_entry) {
                if (device->sdev)
                        pqi_remove_device(ctrl_info, device);
-               list_del(&device->scsi_device_list_entry);
                pqi_free_device(device);
        }
-
-       spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
 }
 
 static int pqi_scan_scsi_devices(struct pqi_ctrl_info *ctrl_info)