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Date:   Thu, 16 Apr 2020 15:58:36 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Jules Irenge <jbi.octave@gmail.com>
Cc:     linux-kernel@vger.kernel.org, boqun.feng@gmail.com,
        Jiri Slaby <jslaby@suse.com>,
        "open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>
Subject: Re: [PATCH 7/7] tty: serial_core: Add missing annotation for
 _unlock_and_check_sysrq()
Message-ID: <20200416135836.GB1295013@kroah.com>
References: <0/7>
 <20200331204643.11262-1-jbi.octave@gmail.com>
 <20200331204643.11262-8-jbi.octave@gmail.com>
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On Tue, Mar 31, 2020 at 09:46:43PM +0100, Jules Irenge wrote:
> Sparse reports a warning at _unlock_and_check_sysrq()
> 
> warning: context imbalance in uart_unlock_and_check_sysrq()
> 	- unexpected unlock
> 
> The root cause is the missing annotation at _unlock_and_check_sysrq()
> Add the missing __releases(&port->lock) annotation.
> 
> Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
> ---
>  drivers/tty/serial/serial_core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index 76e506ee335c..32f93f03efce 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -3121,6 +3121,7 @@ int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
>  EXPORT_SYMBOL_GPL(uart_prepare_sysrq_char);
>  
>  void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
> +	__releases(&port->lock)
>  {
>  	int sysrq_ch;
>  
> -- 
> 2.24.1
> 

This is already in the tree, are you sure you are not working from an
older one?

greg k-h