diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2024-04-17 12:03:27 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-17 14:26:45 +0300 |
| commit | 13c785323b36b845300b256d0e5963c3727667d7 (patch) | |
| tree | ddba327a81f987725ab336b1c67f8d689cd24442 /drivers/tty/serial/dz.h | |
| parent | 1aa4ad4eb695bac1b0a7ba542a16d6833c9c8dd8 (diff) | |
| download | linux-13c785323b36b845300b256d0e5963c3727667d7.tar.xz | |
serial: stm32: Return IRQ_NONE in the ISR if no handling happend
If there is a stuck irq that the handler doesn't address, returning
IRQ_HANDLED unconditionally makes it impossible for the irq core to
detect the problem and disable the irq. So only return IRQ_HANDLED if
an event was handled.
A stuck irq is still problematic, but with this change at least it only
makes the UART nonfunctional instead of occupying the (usually only) CPU
by 100% and so stall the whole machine.
Fixes: 48a6092fb41f ("serial: stm32-usart: Add STM32 USART Driver")
Cc: stable@vger.kernel.org
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/5f92603d0dfd8a5b8014b2b10a902d91e0bb881f.1713344161.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/dz.h')
0 files changed, 0 insertions, 0 deletions