Re: Can request_firmware be called from a platform_driver ?
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Hi Mike, On Wed, Apr 18, 2012 at 11:07 AM, Holmes, Michael A (Mike) <Mike.Holmes@xxxxxxx> wrote: > Hi > > I have a fully working system to which I want to add the request firmware > mechanism to an existing platform driver I have working. > > I instrumented mdev in busybox 1.5.1 and in firmware_class.c 2.6.35 so that > I could figure this out. > > What I see with firmware_request() is that the kernel makes the firmware > request and does not find any firmware and mdev sees nothing. > > However if I change my code to do request_firmare_nowait(), the entire > system comes up and about 30seconds in the timeout calls my kernel side > continue for request_firmare_nowait() and I DO now see my request handled by > mdev, however it is a REMOVE request not the ADD request. > > All this makes me think that platform drivers exist before the hotplug > mechanism is able to operate, is this true ? Well, request_firmware is ultimately serviced by a user-space process. So platform drivers compiled statically into the kernel get initialized long before user-space starts. Platform drivers compiled as modules will get the firmware loaded much more quickly after loading the module. -- Dave Hylands Shuswap, BC, Canada http://www.davehylands.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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