target: Fix divide by zero bug in fabric_max_sectors for unconfigured devices

[linux-2.6-block.git] / drivers / target / target_core_device.c

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index e2695101bb9911f1d02ba03217a3b0f059fbf0ac..f2aa7543d20aca556855c4fbde2ba3aa00b8ffcc 100644 (file)
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -941,6 +941,8 @@ int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
 
 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
 {
+       int block_size = dev->dev_attrib.block_size;
+
        if (dev->export_count) {
                pr_err("dev[%p]: Unable to change SE Device"
                        " fabric_max_sectors while export_count is %d\n",
@@ -978,8 +980,12 @@ int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
        /*
         * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
         */
+       if (!block_size) {
+               block_size = 512;
+               pr_warn("Defaulting to 512 for zero block_size\n");
+       }
        fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
-                                                     dev->dev_attrib.block_size);
+                                                     block_size);
 
        dev->dev_attrib.fabric_max_sectors = fabric_max_sectors;
        pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",