tree 1e662bb29f04c2b875207d907db917476ddce60b
parent 811fa4004485dec8977176bf605a5b0508ee206c
author Rafael J. Wysocki <rjw@sisk.pl> 1332970202 +0200
committer Rafael J. Wysocki <rjw@sisk.pl> 1332970202 +0200

firmware_class: Do not warn that system is not ready from async loads

If firmware is requested asynchronously, by calling
request_firmware_nowait(), there is no reason to fail the request
(and warn the user) when the system is (presumably temporarily)
unready to handle it (because user space is not available yet or
frozen).  For this reason, introduce an alternative routine for
read-locking umhelper_sem, usermodehelper_read_lock_wait(), that
will wait for usermodehelper_disabled to be unset (possibly with
a timeout) and make request_firmware_work_func() use it instead of
usermodehelper_read_trylock().

Accordingly, modify request_firmware() so that it uses
usermodehelper_read_trylock() to acquire umhelper_sem and remove
the code related to that lock from _request_firmware().

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org