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authorLukas Wunner <lukas@wunner.de>2022-09-11 10:22:01 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-09-22 16:37:59 +0200
commit60f361722ad2ae5ee667d0b0545d40c42f754daf (patch)
treeb7a226b198aee528b11c555c5f0b1910fe43329b /drivers
parent1d10cd4da593bc0196a239dcc54dac24b6b0a74e (diff)
serial: fsl_lpuart: Reset prior to registration
Since commit bd5305dcabbc ("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: bd5305dcabbc ("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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/tty/serial/fsl_lpuart.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index b20f6f2fa51c..fbc4b071b330 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -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;
}