iwlwifi: dbg_ini: use vzalloc to allocate dumping memory regions

During dump flow, the driver allocates spaces to store the memory
regions that will be included in the dump. These regions can be very
large so in order to avoid allocation failure, use vzalloc instead.
The kmalloc uses GFP_KERNEL and the driver does not make any use of the
fact that the memory is contiguous so the same functionality is
maintained.
Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/dbg.c

@@ -1846,7 +1846,7 @@ static u32 iwl_dump_ini_mem(struct iwl_fw_runtime *fwrt, struct list_head *list,
 	if (!size)
 		return 0;
 
-	entry = kmalloc(sizeof(*entry) + sizeof(*tlv) + size, GFP_KERNEL);
+	entry = vzalloc(sizeof(*entry) + sizeof(*tlv) + size);
 	if (!entry)
 		return 0;
 
@@ -1892,7 +1892,7 @@ static u32 iwl_dump_ini_mem(struct iwl_fw_runtime *fwrt, struct list_head *list,
 	return entry->size;
 
 out_err:
-	kfree(entry);
+	vfree(entry);
 
 	return 0;
 }
@@ -1914,7 +1914,7 @@ static u32 iwl_dump_ini_info(struct iwl_fw_runtime *fwrt,
 		num_of_cfg_names++;
 	}
 
-	entry = kmalloc(sizeof(*entry) + size, GFP_KERNEL);
+	entry = vzalloc(sizeof(*entry) + size);
 	if (!entry)
 		return 0;
 
@@ -2121,7 +2121,7 @@ static u32 iwl_dump_ini_file_gen(struct iwl_fw_runtime *fwrt,
 	    !le64_to_cpu(trigger->regions_mask))
 		return 0;
 
-	entry = kmalloc(sizeof(*entry) + sizeof(*hdr), GFP_KERNEL);
+	entry = vzalloc(sizeof(*entry) + sizeof(*hdr));
 	if (!entry)
 		return 0;
 
@@ -2129,7 +2129,7 @@ static u32 iwl_dump_ini_file_gen(struct iwl_fw_runtime *fwrt,
 
 	size = iwl_dump_ini_trigger(fwrt, dump_data, list);
 	if (!size) {
-		kfree(entry);
+		vfree(entry);
 		return 0;
 	}
 
@@ -2195,7 +2195,7 @@ static void iwl_dump_ini_list_free(struct list_head *list)
 			list_entry(list->next, typeof(*entry), list);
 
 		list_del(&entry->list);
-		kfree(entry);
+		vfree(entry);
 	}
 }