[PATCH] ide: fix kmalloc_node breakage in ide driver

Patch fixes oops caused by ide interfaces not on pci.  pcibus_to_node
causes the kernel to crash otherwise.  Patch also adds a BUG_ON to check if
hwif is NULL.

Signed-off-by: Christoph Lameter <christoph@lameter.com>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Cc: Andi Kleen <ak@muc.de>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 13 insertions, 3 deletions

diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 7df85af75371..94daf40ae323 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -960,6 +960,15 @@ static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 }
 #endif /* MAX_HWIFS > 1 */
 
+static inline int hwif_to_node(ide_hwif_t *hwif)
+{
+        if (hwif->pci_dev)
+                return pcibus_to_node(hwif->pci_dev->bus);
+        else
+                /* Add ways to determine the node of other busses here */
+                return -1;
+}
+
 /*
  * init request queue
  */
@@ -978,8 +987,7 @@ static int ide_init_queue(ide_drive_t *drive)
          *      do not.
          */
 
-        q = blk_init_queue_node(do_ide_request, &ide_lock,
-                                pcibus_to_node(drive->hwif->pci_dev->bus));
+        q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
         if (!q)
                 return 1;
 
@@ -1048,6 +1056,8 @@ static int init_irq (ide_hwif_t *hwif)
 
         BUG_ON(in_interrupt());
         BUG_ON(irqs_disabled());        
+        BUG_ON(hwif == NULL);
+
         down(&ide_cfg_sem);
         hwif->hwgroup = NULL;
 #if MAX_HWIFS > 1
@@ -1097,7 +1107,7 @@ static int init_irq (ide_hwif_t *hwif)
                 spin_unlock_irq(&ide_lock);
         } else {
                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t), GFP_KERNEL,
-                        pcibus_to_node(hwif->drives[0].hwif->pci_dev->bus));
+                                        hwif_to_node(hwif->drives[0].hwif));
                 if (!hwgroup)
                         goto out_up;