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commit1e451977e1upstream. There are fuel gauges in the bq27xxx series (e.g. bq27z561) which may in some cases report 0xff as the value of BQ27XXX_REG_FLAGS that should not be interpreted as "no battery" like for a disconnected battery with some built in bq27000 chip. So restrict the no-battery detection originally introduced by commit3dd843e1c2("bq27000: report missing device better.") to the bq27000. There is no need to backport further because this was hidden before commitf16d9fb6cf("power: supply: bq27xxx: Retrieve again when busy") Fixes:f16d9fb6cf("power: supply: bq27xxx: Retrieve again when busy") Suggested-by: Jerry Lv <Jerry.Lv@axis.com> Cc: stable@vger.kernel.org Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> Link: https://lore.kernel.org/r/dd979fa6855fd051ee5117016c58daaa05966e24.1755945297.git.hns@goldelico.com Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>