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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 1 Mar 2024 22:45:28 +0100
Subject: [PATCH 15/18] serial: pch: Don't disable interrupts while acquiring
lock in ISR.
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.8/older/patches-6.8.2-rt11.tar.xz
The interrupt service routine is always invoked with disabled
interrupts.
Remove the _irqsave() from the locking functions in the interrupts
service routine/ pch_uart_interrupt().
Link: https://lore.kernel.org/r/20240301215246.891055-16-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/tty/serial/pch_uart.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -1010,11 +1010,10 @@ static irqreturn_t pch_uart_interrupt(in
u8 lsr;
int ret = 0;
unsigned char iid;
- unsigned long flags;
int next = 1;
u8 msr;
- spin_lock_irqsave(&priv->lock, flags);
+ spin_lock(&priv->lock);
handled = 0;
while (next) {
iid = pch_uart_hal_get_iid(priv);
@@ -1074,7 +1073,7 @@ static irqreturn_t pch_uart_interrupt(in
handled |= (unsigned int)ret;
}
- spin_unlock_irqrestore(&priv->lock, flags);
+ spin_unlock(&priv->lock);
return IRQ_RETVAL(handled);
}
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