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serial: fsl_lpuart: Reset prior to registration

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Since commit bd5305dcab ("tty: serial: fsl_lpuart: do software reset
for imx7ulp and imx8qxp"), certain i.MX UARTs are reset after they've
already been registered.  Register state may thus be clobbered after
user space has begun to open and access the UART.

Avoid by performing the reset prior to registration.

Fixes: bd5305dcab ("tty: serial: fsl_lpuart: do software reset for imx7ulp and imx8qxp")
Cc: stable@vger.kernel.org # v5.15+
Cc: Fugang Duan <fugang.duan@nxp.com>
Cc: Sherry Sun <sherry.sun@nxp.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: https://lore.kernel.org/r/72fb646c1b0b11c989850c55f52f9ff343d1b2fa.1662884345.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Wunner 2022-09-11 10:22:01 +02:00 committed by Greg Kroah-Hartman
parent 1d10cd4da5
commit 60f361722a
1 changed files with 5 additions and 4 deletions
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9
drivers/tty/serial/fsl_lpuart.c
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@ -2724,14 +2724,15 @@ static int lpuart_probe(struct platform_device *pdev)
lpuart_reg.cons = LPUART_CONSOLE;
handler = lpuart_int;
}
ret = uart_add_one_port(&lpuart_reg, &sport->port);
if (ret)
goto failed_attach_port;
ret = lpuart_global_reset(sport);
if (ret)
goto failed_reset;
ret = uart_add_one_port(&lpuart_reg, &sport->port);
if (ret)
goto failed_attach_port;
ret = uart_get_rs485_mode(&sport->port);
if (ret)
goto failed_get_rs485;
@ -2747,9 +2748,9 @@ static int lpuart_probe(struct platform_device *pdev)
failed_irq_request:
failed_get_rs485:
failed_reset:
uart_remove_one_port(&lpuart_reg, &sport->port);
failed_attach_port:
failed_reset:
lpuart_disable_clks(sport);
return ret;
}