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serial: stm32: Ignore return value of uart_remove_one_port() in .remove() 

[ Upstream commit 6bd6cd29c9 ]

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 5c5a7680e6 ("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>
This commit is contained in:
Uwe Kleine-König 2023-05-12 19:38:09 +02:00 committed by Greg Kroah-Hartman
parent 759ffc164d
commit 9eb0bd1eea
1 changed files with 1 additions and 4 deletions
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5
drivers/tty/serial/stm32-usart.c
View File

@ -1755,13 +1755,10 @@ 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);