tree 190edf149f3eeeda3d07b43aecbe8c286eae3c11
parent 608024a3a186c9bf958fe01dac244e187b1b04af
author Alexander Shiyan <shc_work@mail.ru> 1545218360 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1575556481 +0100

serial: max310x: Fix tx_empty() callback

[ Upstream commit a8da3c7873ea57acb8f9cea58c0af477522965aa ]

Function max310x_tx_empty() accesses the IRQSTS register, which is
cleared by IC when reading, so if there is an interrupt status, we
will lose it. This patch implement the transmitter check only by
the current FIFO level.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>