[PATCH net-next] net: sungem_phy: Constify struct mii_phy_def

[PATCH net-next] net: sungem_phy: Constify struct mii_phy_def

[Christophe JAILLET]

'struct mii_phy_def' are not modified in this driver.

Constifying these structures moves some data to a read-only section, so
increase overall security.

While at it fix the checkpatch warning related to this patch (some missing
newlines and spaces around *)

On a x86_64, with allmodconfig:
Before:
======
  27709	    928	      0	  28637	   6fdd	drivers/net/sungem_phy.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  28157	    476	      0	  28633	   6fd9	drivers/net/sungem_phy.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
Compile tested-only.
---
 drivers/net/sungem_phy.c   | 35 +++++++++++++++++++----------------
 include/linux/sungem_phy.h |  2 +-
 2 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/drivers/net/sungem_phy.c b/drivers/net/sungem_phy.c
index d591e33268e5..55aa8d0c8e1f 100644
--- a/drivers/net/sungem_phy.c
+++ b/drivers/net/sungem_phy.c
@@ -893,7 +893,7 @@ static const struct mii_phy_ops bcm5201_phy_ops = {
 	.read_link	= genmii_read_link,
 };
 
-static struct mii_phy_def bcm5201_phy_def = {
+static const struct mii_phy_def bcm5201_phy_def = {
 	.phy_id		= 0x00406210,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5201",
@@ -912,7 +912,7 @@ static const struct mii_phy_ops bcm5221_phy_ops = {
 	.read_link	= genmii_read_link,
 };
 
-static struct mii_phy_def bcm5221_phy_def = {
+static const struct mii_phy_def bcm5221_phy_def = {
 	.phy_id		= 0x004061e0,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5221",
@@ -930,7 +930,8 @@ static const struct mii_phy_ops bcm5241_phy_ops = {
 	.poll_link	= genmii_poll_link,
 	.read_link	= genmii_read_link,
 };
-static struct mii_phy_def bcm5241_phy_def = {
+
+static const struct mii_phy_def bcm5241_phy_def = {
 	.phy_id		= 0x0143bc30,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5241",
@@ -949,7 +950,7 @@ static const struct mii_phy_ops bcm5400_phy_ops = {
 	.read_link	= bcm54xx_read_link,
 };
 
-static struct mii_phy_def bcm5400_phy_def = {
+static const struct mii_phy_def bcm5400_phy_def = {
 	.phy_id		= 0x00206040,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5400",
@@ -968,7 +969,7 @@ static const struct mii_phy_ops bcm5401_phy_ops = {
 	.read_link	= bcm54xx_read_link,
 };
 
-static struct mii_phy_def bcm5401_phy_def = {
+static const struct mii_phy_def bcm5401_phy_def = {
 	.phy_id		= 0x00206050,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5401",
@@ -987,7 +988,7 @@ static const struct mii_phy_ops bcm5411_phy_ops = {
 	.read_link	= bcm54xx_read_link,
 };
 
-static struct mii_phy_def bcm5411_phy_def = {
+static const struct mii_phy_def bcm5411_phy_def = {
 	.phy_id		= 0x00206070,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5411",
@@ -1007,7 +1008,7 @@ static const struct mii_phy_ops bcm5421_phy_ops = {
 	.enable_fiber   = bcm5421_enable_fiber,
 };
 
-static struct mii_phy_def bcm5421_phy_def = {
+static const struct mii_phy_def bcm5421_phy_def = {
 	.phy_id		= 0x002060e0,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5421",
@@ -1026,7 +1027,7 @@ static const struct mii_phy_ops bcm5421k2_phy_ops = {
 	.read_link	= bcm54xx_read_link,
 };
 
-static struct mii_phy_def bcm5421k2_phy_def = {
+static const struct mii_phy_def bcm5421k2_phy_def = {
 	.phy_id		= 0x002062e0,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5421-K2",
@@ -1045,7 +1046,7 @@ static const struct mii_phy_ops bcm5461_phy_ops = {
 	.enable_fiber   = bcm5461_enable_fiber,
 };
 
-static struct mii_phy_def bcm5461_phy_def = {
+static const struct mii_phy_def bcm5461_phy_def = {
 	.phy_id		= 0x002060c0,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5461",
@@ -1064,7 +1065,7 @@ static const struct mii_phy_ops bcm5462V_phy_ops = {
 	.read_link	= bcm54xx_read_link,
 };
 
-static struct mii_phy_def bcm5462V_phy_def = {
+static const struct mii_phy_def bcm5462V_phy_def = {
 	.phy_id		= 0x002060d0,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "BCM5462-Vesta",
@@ -1094,7 +1095,7 @@ static const struct mii_phy_ops marvell88e1111_phy_ops = {
 /* two revs in darwin for the 88e1101 ... I could use a datasheet
  * to get the proper names...
  */
-static struct mii_phy_def marvell88e1101v1_phy_def = {
+static const struct mii_phy_def marvell88e1101v1_phy_def = {
 	.phy_id		= 0x01410c20,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "Marvell 88E1101v1",
@@ -1102,7 +1103,8 @@ static struct mii_phy_def marvell88e1101v1_phy_def = {
 	.magic_aneg	= 1,
 	.ops		= &marvell88e1101_phy_ops
 };
-static struct mii_phy_def marvell88e1101v2_phy_def = {
+
+static const struct mii_phy_def marvell88e1101v2_phy_def = {
 	.phy_id		= 0x01410c60,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "Marvell 88E1101v2",
@@ -1110,7 +1112,8 @@ static struct mii_phy_def marvell88e1101v2_phy_def = {
 	.magic_aneg	= 1,
 	.ops		= &marvell88e1101_phy_ops
 };
-static struct mii_phy_def marvell88e1111_phy_def = {
+
+static const struct mii_phy_def marvell88e1111_phy_def = {
 	.phy_id		= 0x01410cc0,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "Marvell 88E1111",
@@ -1127,7 +1130,7 @@ static const struct mii_phy_ops generic_phy_ops = {
 	.read_link	= genmii_read_link
 };
 
-static struct mii_phy_def genmii_phy_def = {
+static const struct mii_phy_def genmii_phy_def = {
 	.phy_id		= 0x00000000,
 	.phy_id_mask	= 0x00000000,
 	.name		= "Generic MII",
@@ -1136,7 +1139,7 @@ static struct mii_phy_def genmii_phy_def = {
 	.ops		= &generic_phy_ops
 };
 
-static struct mii_phy_def* mii_phy_table[] = {
+static const struct mii_phy_def *mii_phy_table[] = {
 	&bcm5201_phy_def,
 	&bcm5221_phy_def,
 	&bcm5241_phy_def,
@@ -1156,9 +1159,9 @@ static struct mii_phy_def* mii_phy_table[] = {
 
 int sungem_phy_probe(struct mii_phy *phy, int mii_id)
 {
+	const struct mii_phy_def *def;
 	int rc;
 	u32 id;
-	struct mii_phy_def* def;
 	int i;
 
 	/* We do not reset the mii_phy structure as the driver
diff --git a/include/linux/sungem_phy.h b/include/linux/sungem_phy.h
index c505f30e8b68..eecc7eb63bfb 100644
--- a/include/linux/sungem_phy.h
+++ b/include/linux/sungem_phy.h
@@ -40,7 +40,7 @@ enum {
 /* An instance of a PHY, partially borrowed from mii_if_info */
 struct mii_phy
 {
-	struct mii_phy_def*	def;
+	const struct mii_phy_def *def;
 	u32			advertising;
 	int			mii_id;
 
-- 
2.45.2

Re: [PATCH net-next] net: sungem_phy: Constify struct mii_phy_def

[Andrew Lunn]

On Wed, Aug 07, 2024 at 02:22:26PM +0200, Christophe JAILLET wrote:
> 'struct mii_phy_def' are not modified in this driver.
> 
> Constifying these structures moves some data to a read-only section, so
> increase overall security.
> 
> While at it fix the checkpatch warning related to this patch (some missing
> newlines and spaces around *)
> 
> On a x86_64, with allmodconfig:
> Before:
> ======
>   27709	    928	      0	  28637	   6fdd	drivers/net/sungem_phy.o
> 
> After:
> =====
>    text	   data	    bss	    dec	    hex	filename
>   28157	    476	      0	  28633	   6fd9	drivers/net/sungem_phy.o
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH net-next] net: sungem_phy: Constify struct mii_phy_def

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed,  7 Aug 2024 14:22:26 +0200 you wrote:
> 'struct mii_phy_def' are not modified in this driver.
> 
> Constifying these structures moves some data to a read-only section, so
> increase overall security.
> 
> While at it fix the checkpatch warning related to this patch (some missing
> newlines and spaces around *)
> 
> [...]

Here is the summary with links:
  - [net-next] net: sungem_phy: Constify struct mii_phy_def
    https://git.kernel.org/netdev/net-next/c/09612576046a

You are awesome, thank you!
-- 
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