cciss: limit commands allocated on reset_devices

This is to conserve memory in a memory-limited kdump scenario

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

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 2e547bddc5a7..9e761b994b4c 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -4079,6 +4079,11 @@ static int __devinit cciss_find_cfgtables(ctlr_info_t *h)
 static void __devinit cciss_get_max_perf_mode_cmds(struct ctlr_info *h)
 {
         h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));
+
+        /* Limit commands in memory limited kdump scenario. */
+        if (reset_devices && h->max_commands > 32)
+                h->max_commands = 32;
+
         if (h->max_commands < 16) {
                 dev_warn(&h->pdev->dev, "Controller reports "
                         "max supported commands of %d, an obvious lie. "