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serial: stm32: Merge hard IRQ and threaded IRQ handling into single IRQ handler
authorMarek Vasut <marex@denx.de>
Fri, 20 Jan 2023 16:03:32 +0000 (17:03 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 31 Jan 2023 10:15:01 +0000 (11:15 +0100)
commit3f6c02fa712bd453871877fe1d1969625617471e
treeec2674ce6c31ef06dacb349bb2b0325951d18151
parent2241ab53cbb5cdb08a6b2d4688feb13971058f65
serial: stm32: Merge hard IRQ and threaded IRQ handling into single IRQ handler

Requesting an interrupt with IRQF_ONESHOT will run the primary handler
in the hard-IRQ context even in the force-threaded mode. The
force-threaded mode is used by PREEMPT_RT in order to avoid acquiring
sleeping locks (spinlock_t) in hard-IRQ context. This combination
makes it impossible and leads to "sleeping while atomic" warnings.

Use one interrupt handler for both handlers (primary and secondary)
and drop the IRQF_ONESHOT flag which is not needed.

Fixes: e359b4411c283 ("serial: stm32: fix threaded interrupt handling")
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Valentin Caron <valentin.caron@foss.st.com> # V3
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230120160332.57930-1-marex@denx.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/serial/stm32-usart.c