linux-kernel - [PATCH v2 1/2] serial: pmac_zilog: add sparse context annotation

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Message-Id: <20200723123327.5843-2-johan@kernel.org>
Date:   Thu, 23 Jul 2020 14:33:26 +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>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v2 1/2] serial: pmac_zilog: add sparse context annotation

Add sparse context annotation to the receive handler, which releases and
reacquires the port lock, to silence a sparse warning:

	drivers/tty/serial/pmac_zilog.c:255:36: sparse: sparse: context imbalance in 'pmz_receive_chars' - unexpected unlock

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/tty/serial/pmac_zilog.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index ba65a3bbd72a..96e7aa479961 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -213,6 +213,7 @@ static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
 }
 
 static bool pmz_receive_chars(struct uart_pmac_port *uap)
+	__must_hold(&uap->port.lock)
 {
 	struct tty_port *port;
 	unsigned char ch, r1, drop, flag;
-- 
2.26.2