On Mon, Sep 07, 2015 at 02:23:46PM +0200, Tomeu Vizoso wrote: > Some initcalls in the late level assume that some devices will have > already probed without explicitly checking for that. > > After the recent move to defer most device probes when they are > registered, pressure increased in the late initcall level. > > By starting the processing of the deferred queue in device_initcall_sync > we increase the chances that the initcalls mentioned before will find > the devices they depend on to have already probed. Which cases do we have that are outside the driver model and thus affected by this? USB gadgets are one case I'm aware of, and cpufreq is still problematic. I'm wondering if it might be tractable to address the actual problems with the remaining reliance on init ordering here. I'm also wondering if we might end up running into situations where this makes the problem with havinng to defer probes more of an issue on some systems - since we start trying earlier while we are still doing our first pass initialisation we could end up deferring some device then retrying it a bunch of times while going through the earlier phases of init as we continue to register more devices.
Attachment:
signature.asc
Description: Digital signature
