firmware_class: Move request_firmware_nowait() to workqueues
Oddly enough a work_struct was already part of the firmware_work structure but nobody was using it. Instead of creating a new kthread for each request_firmware_nowait() call just schedule the work on the system workqueue. This should avoid some overhead in forking new threads when they're not strictly necessary. Signed-off-by: NStephen Boyd <sboyd@codeaurora.org> Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
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