Re: [RESEND][PATCH] Bluetooth: Make request workqueue freezable

At Tue, 19 May 2015 10:26:46 -0400 (EDT),
Alan Stern wrote:

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 Of just have request_firmware()
actually sleep until userspace is ready. Seriously, why is
request_firmware not just sleeping for us.

It won't work.  The request_firmware call is part of the probe 
sequence, which in turn is part of the resume sequence.  Userspace 
doesn't start running again until the resume sequence is finished.  If 
request_firmware waited for userspace, it would hang.

Note that the recent request_firmware() doesn't need the user-space
invocation (unless the fallback is explicitly enabled) but loads the
file directly.  And, request_firmware() for the cached data is valid
to be called in the resume path.


Takashi