linux-kernel - [PATCH 4.4 099/101] [media] cx23885-dvb: move initialization of a8293

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Message-Id: <20170110131526.626383512@linuxfoundation.org>
Date:   Tue, 10 Jan 2017 14:37:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: [PATCH 4.4 099/101] [media] cx23885-dvb: move initialization of a8293_pdata

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mauro Carvalho Chehab <mchehab@....samsung.com>

commit f0b0faff78c2c2e8efe843de55405a1f0470b8c4 upstream.

Smatch complains about where the au8293_data is placed:

drivers/media/pci/cx23885/cx23885-dvb.c:2174 dvb_register() info: 'a8293_pdata' is not actually initialized (unreached code).

It is not actually expected to have such initialization at

switch {
	foo = bar;

	case:
...
}

Not really sure how gcc does that, but this is something that I would
expect that different compilers would do different things.

David Howells checked with the compiler people: it's not really expected to
initialise as expected.

So, move the initialization outside the switch(), making smatch to
shut up one warning.

Acked-by: David Howells <dhowells@...hat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/pci/cx23885/cx23885-dvb.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/media/pci/cx23885/cx23885-dvb.c
+++ b/drivers/media/pci/cx23885/cx23885-dvb.c
@@ -2168,11 +2168,12 @@ static int dvb_register(struct cx23885_t
 		}
 		port->i2c_client_tuner = client_tuner;
 		break;
-	case CX23885_BOARD_HAUPPAUGE_HVR5525:
-		switch (port->nr) {
+	case CX23885_BOARD_HAUPPAUGE_HVR5525: {
 		struct m88rs6000t_config m88rs6000t_config;
 		struct a8293_platform_data a8293_pdata = {};
 
+		switch (port->nr) {
+
 		/* port b - satellite */
 		case 1:
 			/* attach frontend */
@@ -2267,6 +2268,7 @@ static int dvb_register(struct cx23885_t
 			break;
 		}
 		break;
+	}
 	default:
 		printk(KERN_INFO "%s: The frontend of your DVB/ATSC card "
 			" isn't supported yet\n",