cciss: do not attempt PCI power management reset method if we know it won't work.

Just go straight to the soft-reset method instead.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 31 insertions, 5 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 7990b98d4f73..865484e40841 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -558,7 +558,7 @@ static void __devinit cciss_procinit(ctlr_info_t *h)
 #define to_hba(n) container_of(n, struct ctlr_info, dev)
 #define to_drv(n) container_of(n, drive_info_struct, dev)
 
-/* List of controllers which cannot be reset on kexec with reset_devices */
+/* List of controllers which cannot be hard reset on kexec with reset_devices */
 static u32 unresettable_controller[] = {
         0x324a103C, /* Smart Array P712m */
         0x324b103C, /* SmartArray P711m */
@@ -576,23 +576,45 @@ static u32 unresettable_controller[] = {
         0x409D0E11, /* Smart Array 6400 EM */
 };
 
-static int ctlr_is_resettable(struct ctlr_info *h)
+/* List of controllers which cannot even be soft reset */
+static u32 soft_unresettable_controller[] = {
+        0x409C0E11, /* Smart Array 6400 */
+        0x409D0E11, /* Smart Array 6400 EM */
+};
+
+static int ctlr_is_hard_resettable(u32 board_id)
 {
         int i;
 
         for (i = 0; i < ARRAY_SIZE(unresettable_controller); i++)
-                if (unresettable_controller[i] == h->board_id)
+                if (unresettable_controller[i] == board_id)
                         return 0;
         return 1;
 }
 
+static int ctlr_is_soft_resettable(u32 board_id)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(soft_unresettable_controller); i++)
+                if (soft_unresettable_controller[i] == board_id)
+                        return 0;
+        return 1;
+}
+
+static int ctlr_is_resettable(u32 board_id)
+{
+        return ctlr_is_hard_resettable(board_id) ||
+                ctlr_is_soft_resettable(board_id);
+}
+
 static ssize_t host_show_resettable(struct device *dev,
                                     struct device_attribute *attr,
                                     char *buf)
 {
         struct ctlr_info *h = to_hba(dev);
 
-        return snprintf(buf, 20, "%d\n", ctlr_is_resettable(h));
+        return snprintf(buf, 20, "%d\n", ctlr_is_resettable(h->board_id));
 }
 static DEVICE_ATTR(resettable, S_IRUGO, host_show_resettable, NULL);
 
@@ -4601,12 +4623,16 @@ static __devinit int cciss_kdump_hard_reset_controller(struct pci_dev *pdev)
          * likely not be happy.  Just forbid resetting this conjoined mess.
          */
         cciss_lookup_board_id(pdev, &board_id);
-        if (board_id == 0x409C0E11 || board_id == 0x409D0E11) {
+        if (!ctlr_is_resettable(board_id)) {
                 dev_warn(&pdev->dev, "Cannot reset Smart Array 640x "
                                 "due to shared cache module.");
                 return -ENODEV;
         }
 
+        /* if controller is soft- but not hard resettable... */
+        if (!ctlr_is_hard_resettable(board_id))
+                return -ENOTSUPP; /* try soft reset later. */
+
         /* Save the PCI command register */
         pci_read_config_word(pdev, 4, &command_register);
         /* Turn the board off.  This is so that later pci_restore_state()