[SCSI] gdth: fix Error: Driver 'gdth' is already registered, aborting...

This message appears on modprobe/rmmod/modprobe of the driver.  It's
caused because if the driver has no instances, it returns an error
from gdth_init, which causes the module to fail to load.
Unfortunately, the module's pci driver is still registered at this
point.

Fix this by making gdth behave like a modern driver and insert even if
it doesn't find any instances (in case of hot plug or software driven
binding).

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 16785a2ad035..46771d4c81bd 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -550,7 +550,6 @@ static int __init gdth_search_isa(ulong32 bios_adr)
 #endif /* CONFIG_ISA */
 
 #ifdef CONFIG_PCI
-static bool gdth_pci_registered;
 
 static bool gdth_search_vortex(ushort device)
 {
@@ -5157,8 +5156,13 @@ static int __init gdth_init(void)
 
 #ifdef CONFIG_PCI
         /* scanning for PCI controllers */
-        if (pci_register_driver(&gdth_pci_driver) == 0)
-                gdth_pci_registered = true;
+        if (pci_register_driver(&gdth_pci_driver)) {
+                gdth_ha_str *ha;
+
+                list_for_each_entry(ha, &gdth_instances, list)
+                        gdth_remove_one(ha);
+                return -ENODEV;
+        }
 #endif /* CONFIG_PCI */
 
         TRACE2(("gdth_detect() %d controller detected\n", gdth_ctr_count));
@@ -5181,8 +5185,7 @@ static void __exit gdth_exit(void)
 #endif
 
 #ifdef CONFIG_PCI
-        if (gdth_pci_registered)
-                pci_unregister_driver(&gdth_pci_driver);
+        pci_unregister_driver(&gdth_pci_driver);
 #endif
 
         list_for_each_entry(ha, &gdth_instances, list)