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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-serial@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jirislaby@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH 15/18] serial: pch: Don't disable interrupts while acquiring lock in ISR.
Date: Fri,  1 Mar 2024 22:45:28 +0100	[thread overview]
Message-ID: <20240301215246.891055-16-bigeasy@linutronix.de> (raw)
In-Reply-To: <20240301215246.891055-1-bigeasy@linutronix.de>

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().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/tty/serial/pch_uart.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 124eb816fca7e..6e259f4139153 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -1010,11 +1010,10 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
 	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(int irq, void *dev_id)
 		handled |= (unsigned int)ret;
 	}
 
-	spin_unlock_irqrestore(&priv->lock, flags);
+	spin_unlock(&priv->lock);
 	return IRQ_RETVAL(handled);
 }
 
-- 
2.43.0


  parent reply	other threads:[~2024-03-01 21:52 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-01 21:45 [PATCH 00/18] serial: Use uart_prepare_sysrq_char() Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 01/18] serial: amba-pl011: " Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 02/18] serial: ar933x: " Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 03/18] serial: bcm63xx: " Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 04/18] serial: meson: " Sebastian Andrzej Siewior
2024-03-01 21:45   ` Sebastian Andrzej Siewior
2024-03-01 21:45   ` Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 05/18] serial: msm: " Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 06/18] serial: omap: " Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 07/18] serial: pxa: " Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 08/18] serial: sunplus: " Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 09/18] serial: lpc32xx_hs: Use uart_prepare_sysrq_char() to handle sysrq Sebastian Andrzej Siewior
2024-03-01 21:45   ` Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 10/18] serial: owl: " Sebastian Andrzej Siewior
2024-03-01 21:45   ` Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 11/18] serial: rda: " Sebastian Andrzej Siewior
2024-03-01 21:45   ` Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 12/18] serial: sifive: " Sebastian Andrzej Siewior
2024-03-01 21:45   ` Sebastian Andrzej Siewior
2024-03-07  1:39   ` Samuel Holland
2024-03-07  1:39     ` Samuel Holland
2024-03-01 21:45 ` [PATCH 13/18] serial: pch: Invoke handle_rx_to() directly Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 14/18] serial: pch: Make push_rx() return void Sebastian Andrzej Siewior
2024-03-01 21:45 ` Sebastian Andrzej Siewior [this message]
2024-03-01 21:45 ` [PATCH 16/18] serial: pch: Don't initialize uart_port's spin_lock Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 17/18] serial: pch: Remove eg20t_port::lock Sebastian Andrzej Siewior
2024-03-01 21:45 ` [PATCH 18/18] serial: pch: Use uart_prepare_sysrq_char() Sebastian Andrzej Siewior

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