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isdn/gigaset: improve error handling querying firmware version
commit e055d03 upstream. An out-of-place "OK" response to the "AT+GMR" (get firmware version) command turns out to be, more often than not, a delayed response to a previous command rather than an actual error, so continue waiting for the version number in that case. Signed-off-by: Tilman Schmidt <firstname.lastname@example.org> Signed-off-by: David S. Miller <email@example.com> [bwh: Backported to 3.2: adjust indentation] Signed-off-by: Ben Hutchings <firstname.lastname@example.org>
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