[SCSI] aacraid: add an ifdef'd device delete case instead of taking the device offline

Problem description:
--------------------

The problem reported by one of the customer was when a logical array
is deleted(from the SDK, from the GUI, from arcconf) then the
corresponding physical device (/dev/sdb, for example) is not removed
from the Linux namespace. So you end up with a "dead" device
entry. And some of the linux tools go slightly wonky.

Solution:
---------

Based on the notification from FW, the driver calls
"scsi_remove_device" for the DELETED drive. This call not only informs
the scsi device status to the SCSI mid layer and also it will remove
corresponding scsi device entries from the Linux sysfs.

Signed-off-by: Mahesh Rajashekhara <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 11 insertions, 1 deletions

diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index 9f985267c30f..4dbcc055ac78 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -12,7 +12,7 @@
  *----------------------------------------------------------------------------*/
 
 #ifndef AAC_DRIVER_BUILD
-# define AAC_DRIVER_BUILD 26000
+# define AAC_DRIVER_BUILD 26400
 # define AAC_DRIVER_BRANCH "-ms"
 #endif
 #define MAXIMUM_NUM_CONTAINERS  32
@@ -26,6 +26,8 @@
 #define AAC_MAX_HOSTPHYSMEMPAGES (0xfffff)
 #define AAC_MAX_32BIT_SGBCOUNT  ((unsigned short)256)
 
+#define AAC_DEBUG_INSTRUMENT_AIF_DELETE
+
 /*
  * These macros convert from physical channels to virtual channels
  */
diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index 69692b050e3c..70079146e203 100644
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -1133,6 +1133,9 @@ retry_next:
         if (device) {
                 switch (device_config_needed) {
                 case DELETE:
+#if (defined(AAC_DEBUG_INSTRUMENT_AIF_DELETE))
+                        scsi_remove_device(device);
+#else
                         if (scsi_device_online(device)) {
                                 scsi_device_set_state(device, SDEV_OFFLINE);
                                 sdev_printk(KERN_INFO, device,
@@ -1141,6 +1144,7 @@ retry_next:
                                                 "array deleted" :
                                                 "enclosure services event");
                         }
+#endif
                         break;
                 case ADD:
                         if (!scsi_device_online(device)) {
@@ -1155,12 +1159,16 @@ retry_next:
                 case CHANGE:
                         if ((channel == CONTAINER_CHANNEL)
                          && (!dev->fsa_dev[container].valid)) {
+#if (defined(AAC_DEBUG_INSTRUMENT_AIF_DELETE))
+                                scsi_remove_device(device);
+#else
                                 if (!scsi_device_online(device))
                                         break;
                                 scsi_device_set_state(device, SDEV_OFFLINE);
                                 sdev_printk(KERN_INFO, device,
                                         "Device offlined - %s\n",
                                         "array failed");
+#endif
                                 break;
                         }
                         scsi_rescan_device(&device->sdev_gendev);