BLK_PRE_RUNTIME_SUSP(9) Block Devices BLK_PRE_RUNTIME_SUSP(9)NAMEblk_pre_runtime_suspend - Pre runtime suspend check
SYNOPSIS
int blk_pre_runtime_suspend(struct request_queue * q);
ARGUMENTS
q
the queue of the device
DESCRIPTION
This function will check if runtime suspend is allowed for the device
by examining if there are any requests pending in the queue. If there
are requests pending, the device can not be runtime suspended;
otherwise, the queue's status will be updated to SUSPENDING and the
driver can proceed to suspend the device.
For the not allowed case, we mark last busy for the device so that
runtime PM core will try to autosuspend it some time later.
This function should be called near the start of the device's
runtime_suspend callback.
RETURN
0 - OK to runtime suspend the device -EBUSY - Device should not be
runtime suspended
COPYRIGHTKernel Hackers Manual 3.11 November 2013 BLK_PRE_RUNTIME_SUSP(9)