rsxx: Fix possible kernel panic with invalid config.

This patch fixes a possible Kernel Panic on driver load if
the configuration on the card is messed up or not yet set.
The driver could possible give a 32 bit unsigned all Fs to
the kernel as the device's block size.

Now we only write the block size to the kernel if the
configuration from the card is valid.

Also, driver version is being updated.

Signed-off-by: Philip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2 files changed, 6 insertions, 4 deletions

diff --git a/drivers/block/rsxx/dev.c b/drivers/block/rsxx/dev.c
index d7af441880be..2284f5d3a54a 100644
--- a/drivers/block/rsxx/dev.c
+++ b/drivers/block/rsxx/dev.c
@@ -295,13 +295,15 @@ int rsxx_setup_dev(struct rsxx_cardinfo *card)
                 return -ENOMEM;
         }
 
-        blk_size = card->config.data.block_size;
+        if (card->config_valid) {
+                blk_size = card->config.data.block_size;
+                blk_queue_dma_alignment(card->queue, blk_size - 1);
+                blk_queue_logical_block_size(card->queue, blk_size);
+        }
 
         blk_queue_make_request(card->queue, rsxx_make_request);
         blk_queue_bounce_limit(card->queue, BLK_BOUNCE_ANY);
-        blk_queue_dma_alignment(card->queue, blk_size - 1);
         blk_queue_max_hw_sectors(card->queue, blkdev_max_hw_sectors);
-        blk_queue_logical_block_size(card->queue, blk_size);
         blk_queue_physical_block_size(card->queue, RSXX_HW_BLK_SIZE);
 
         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, card->queue);
diff --git a/drivers/block/rsxx/rsxx_priv.h b/drivers/block/rsxx/rsxx_priv.h
index 23fa05630fef..6bbc64d0f690 100644
--- a/drivers/block/rsxx/rsxx_priv.h
+++ b/drivers/block/rsxx/rsxx_priv.h
@@ -52,7 +52,7 @@ struct proc_cmd;
 #define RS70_PCI_REV_SUPPORTED  4
 
 #define DRIVER_NAME "rsxx"
-#define DRIVER_VERSION "4.0.2.2510"
+#define DRIVER_VERSION "4.0.3.2516"
 
 /* Block size is 4096 */
 #define RSXX_HW_BLK_SHIFT               12