serial: mvebu-uart: do not allow changing baudrate when uartclk is not available

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Testing mvuart->clk for non-error is not enough as mvuart->clk may contain
valid clk pointer but when clk_prepare_enable(mvuart->clk) failed then
port->uartclk is zero.

When mvuart->clk is not available then port->uartclk is zero too.

Parent clock rate port->uartclk is needed to calculate UART clock divisor
and without it is not possible to change baudrate.

So fix test condition when it is possible to change baudrate.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 68a0db1d7d ("serial: mvebu-uart: add function to change baudrate")
Link: https://lore.kernel.org/r/20210624224909.6350-3-pali@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Pali Rohár 2021-06-25 00:49:01 +02:00 • committed by Greg Kroah-Hartman

parent 9078204ca5

commit ecd6b010d8

1 changed files with 2 additions and 3 deletions

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drivers/tty/serial/mvebu-uart.c

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