linux-kernel - [PATCH v2 2/2] serial: msm_serial: add sparse context annotation

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Date:   Thu, 23 Jul 2020 14:33:27 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>
Subject: [PATCH v2 2/2] serial: msm_serial: add sparse context annotation

Add sparse context annotation to the receive handlers, which release and
reacquire the port lock, to silence sparse warnings:

	drivers/tty/serial/msm_serial.c:748:25: warning: context imbalance in 'msm_handle_rx_dm' - unexpected unlock
	drivers/tty/serial/msm_serial.c:814:28: warning: context imbalance in 'msm_handle_rx' - unexpected unlock

Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/tty/serial/msm_serial.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 60a9c53fa7cb..87f005e5d2af 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -696,6 +696,7 @@ static void msm_enable_ms(struct uart_port *port)
 }
 
 static void msm_handle_rx_dm(struct uart_port *port, unsigned int misr)
+	__must_hold(&port->lock)
 {
 	struct tty_port *tport = &port->state->port;
 	unsigned int sr;
@@ -771,6 +772,7 @@ static void msm_handle_rx_dm(struct uart_port *port, unsigned int misr)
 }
 
 static void msm_handle_rx(struct uart_port *port)
+	__must_hold(&port->lock)
 {
 	struct tty_port *tport = &port->state->port;
 	unsigned int sr;
-- 
2.26.2