1 # Copyright (c) 2012 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 import subprocess 6 from autotest_lib.client.bin import test 7 from autotest_lib.client.common_lib import error 8 9 class kernel_AsyncDriverProbe(test.test): 10 """ 11 Handle checking asynchronous device probing. 12 """ 13 version = 1 14 15 def module_loaded(self, module): 16 """ 17 Detect if the given module is already loaded in the kernel. 18 19 @param module: name of module to check 20 """ 21 module = module.replace('-', '_') 22 match = "%s " % (module) 23 for line in open("/proc/modules"): 24 if line.startswith(match): 25 return True 26 return False 27 28 def rmmod(self, module): 29 """ 30 Unload a module if it is already loaded in the kernel. 31 32 @param module: name of module to unload 33 """ 34 if self.module_loaded(module): 35 subprocess.call(["rmmod", module]) 36 37 def run_once(self): 38 """ 39 Try loading the test module. It will time registration for 40 synchronous and asynchronous cases and will fail to load if 41 timing is off. 42 """ 43 44 module = "test_async_driver_probe" 45 46 # Start from a clean slate. 47 self.rmmod(module) 48 49 exit_code = subprocess.call(["modprobe", "-n", "-q", module]) 50 if exit_code: 51 raise error.TestNAError( 52 "%s.ko module does not seem to be available " 53 "(modprobe rc=%s); skipping async probe test" % 54 (module, exit_code)) 55 56 # Try loading the module. If it loads successfully test passes. 57 subprocess.call(["modprobe", module]) 58 loaded = self.module_loaded(module) 59 60 # Clean up after ourselves 61 self.rmmod(module) 62 63 if not loaded: 64 raise error.TestFail("Test module failed to load") 65
