Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 6.1 01/34] serial: stm32: Ignore return value of uart_remove_one_port() in .remove() | Date | Sun, 23 Jul 2023 21:32:04 -0400 |
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From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
[ Upstream commit 6bd6cd29c92401a101993290051fa55078238a52 ]
Returning early from stm32_usart_serial_remove() results in a resource leak as several cleanup functions are not called. The driver core ignores the return value and there is no possibility to clean up later.
uart_remove_one_port() only returns non-zero if there is some inconsistency (i.e. stm32_usart_driver.state[port->line].uart_port == NULL). This should never happen, and even if it does it's a bad idea to exit early in the remove callback without cleaning up.
This prepares changing the prototype of struct platform_driver::remove to return void. See commit 5c5a7680e67b ("platform: Provide a remove callback that returns no value") for further details about this quest.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20230512173810.131447-2-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/tty/serial/stm32-usart.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 28edbaf7bb329..2a9c4058824a8 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -1753,13 +1753,10 @@ static int stm32_usart_serial_remove(struct platform_device *pdev) struct uart_port *port = platform_get_drvdata(pdev); struct stm32_port *stm32_port = to_stm32_port(port); const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; - int err; u32 cr3; pm_runtime_get_sync(&pdev->dev); - err = uart_remove_one_port(&stm32_usart_driver, port); - if (err) - return(err); + uart_remove_one_port(&stm32_usart_driver, port); pm_runtime_disable(&pdev->dev); pm_runtime_set_suspended(&pdev->dev); -- 2.39.2
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