Patch "bcm63xx_enet: avoid uninitialized variable warning" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

bcm63xx_enet: avoid uninitialized variable warning

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
bcm63xx_enet-avoid-uninitialized-variable-warning.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Arnd Bergmann <[email protected]>
Date: Wed, 18 Jan 2017 15:52:53 +0100
Subject: bcm63xx_enet: avoid uninitialized variable warning

From: Arnd Bergmann <[email protected]>

commit df384d435a5c034c735df3d9ea87a03172c59b56 upstream.

gcc-7 and probably earlier versions get confused by this function and print a harmless warning:

drivers/net/ethernet/broadcom/bcm63xx_enet.c: In function 'bcm_enet_open':
drivers/net/ethernet/broadcom/bcm63xx_enet.c:1130:3: error: 'phydev' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This adds an initialization for the 'phydev' variable when it is unused and changes the check to test for that NULL pointer to make it clear that we always pass a valid pointer here.

---
 drivers/net/ethernet/broadcom/bcm63xx_enet.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

@@ -913,6 +913,8 @@ static int bcm_enet_open(struct net_devi
 		priv->old_link = 0;
 		priv->old_duplex = -1;
 		priv->old_pause = -1;
+	} else {
+		phydev = NULL;
 	}
 
 	/* mask all interrupts and request them */

@@ -1083,7 +1085,7 @@ static int bcm_enet_open(struct net_devi
 	enet_dmac_writel(priv, priv->dma_chan_int_mask,
 			 ENETDMAC_IRMASK, priv->tx_chan);
 
-	if (priv->has_phy)
+	if (phydev)
 		phy_start(phydev);
 	else
 		bcm_enet_adjust_link(dev);

@@ -1126,7 +1128,7 @@ out_freeirq:
 	free_irq(dev->irq, dev);
 
 out_phy_disconnect:
-	if (priv->has_phy)
+	if (phydev)
 		phy_disconnect(phydev);
 
 	return ret;

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/mips-ip27-disable-qlge-driver-in-defconfig.patch queue-4.9/bcm63xx_enet-avoid-uninitialized-variable-warning.patch queue-4.9/mips-update-ip27_defconfig-for-scsi_dh-change.patch queue-4.9/mtd-pmcmsp-use-kstrndup-instead-of-kmalloc-strncpy.patch queue-4.9/cpmac-remove-hopeless-warning.patch queue-4.9/mips-vdso-avoid-duplicate-cac_base-definition.patch queue-4.9/mips-ip22-fix-ip28-build-for-modern-gcc.patch queue-4.9/mips-update-lemote2f_defconfig-for-cpu_freq_stat-change.patch queue-4.9/crypto-improve-gcc-optimization-flags-for-serpent-and-wp512.patch queue-4.9/mips-ralink-remove-unused-rt-_wdt_reset-functions.patch queue-4.9/mips-ralink-remove-unused-timer-functions.patch queue-4.9/mips-update-defconfigs-for-nf_ct_proto_dccp-udplite-change.patch