diff options
| -rw-r--r-- | drivers/base/power/runtime.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index cd92e1c77cb..1244930e3d7 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -348,7 +348,24 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev) if (!cb) return -ENOSYS; - retval = __rpm_callback(cb, dev); + if (dev->power.memalloc_noio) { + unsigned int noio_flag; + + /* + * Deadlock might be caused if memory allocation with + * GFP_KERNEL happens inside runtime_suspend and + * runtime_resume callbacks of one block device's + * ancestor or the block device itself. Network + * device might be thought as part of iSCSI block + * device, so network device and its ancestor should + * be marked as memalloc_noio too. + */ + noio_flag = memalloc_noio_save(); + retval = __rpm_callback(cb, dev); + memalloc_noio_restore(noio_flag); + } else { + retval = __rpm_callback(cb, dev); + } dev->power.runtime_error = retval; return retval != -EACCES ? retval : -EIO; |