[PATCH net] net: dsa: mt7530: correct ds->num_ports

[PATCH net] net: dsa: mt7530: correct ds->num_ports

[DENG Qingfang]

Setting ds->num_ports to DSA_MAX_PORTS made DSA core allocate unnecessary
dsa_port's and call mt7530_port_disable for non-existent ports.

Set it to MT7530_NUM_PORTS to fix that, and dsa_is_user_port check in
port_enable/disable is no longer required.

Cc: stable@vger.kernel.org
Signed-off-by: DENG Qingfang <dqfext@gmail.com>
---
 drivers/net/dsa/mt7530.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index a3b49abd32f1..dbd15da977b5 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -1035,9 +1035,6 @@ mt7530_port_enable(struct dsa_switch *ds, int port,
 {
 	struct mt7530_priv *priv = ds->priv;
 
-	if (!dsa_is_user_port(ds, port))
-		return 0;
-
 	mutex_lock(&priv->reg_mutex);
 
 	/* Allow the user port gets connected to the cpu port and also
@@ -1060,9 +1057,6 @@ mt7530_port_disable(struct dsa_switch *ds, int port)
 {
 	struct mt7530_priv *priv = ds->priv;
 
-	if (!dsa_is_user_port(ds, port))
-		return;
-
 	mutex_lock(&priv->reg_mutex);
 
 	/* Clear up all port matrix which could be restored in the next
@@ -3265,7 +3259,7 @@ mt7530_probe(struct mdio_device *mdiodev)
 		return -ENOMEM;
 
 	priv->ds->dev = &mdiodev->dev;
-	priv->ds->num_ports = DSA_MAX_PORTS;
+	priv->ds->num_ports = MT7530_NUM_PORTS;
 
 	/* Use medatek,mcm property to distinguish hardware type that would
 	 * casues a little bit differences on power-on sequence.
-- 
2.25.1

Re: [PATCH net] net: dsa: mt7530: correct ds->num_ports

[Florian Fainelli]

On 10/15/2021 11:24 PM, DENG Qingfang wrote:
> Setting ds->num_ports to DSA_MAX_PORTS made DSA core allocate unnecessary
> dsa_port's and call mt7530_port_disable for non-existent ports.
> 
> Set it to MT7530_NUM_PORTS to fix that, and dsa_is_user_port check in
> port_enable/disable is no longer required.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: DENG Qingfang <dqfext@gmail.com>

Do you really want to target the net tree for this change?
-- 
Florian

Re: [PATCH net] net: dsa: mt7530: correct ds->num_ports

[DENG Qingfang]

On Sat, Oct 16, 2021 at 07:36:14PM -0700, Florian Fainelli wrote:
> On 10/15/2021 11:24 PM, DENG Qingfang wrote:
> > Setting ds->num_ports to DSA_MAX_PORTS made DSA core allocate unnecessary
> > dsa_port's and call mt7530_port_disable for non-existent ports.
> > 
> > Set it to MT7530_NUM_PORTS to fix that, and dsa_is_user_port check in
> > port_enable/disable is no longer required.
> > 
> > Cc: stable@vger.kernel.org
> > Signed-off-by: DENG Qingfang <dqfext@gmail.com>
> 
> Do you really want to target the net tree for this change?

Yes because I consider this a bug fix.

Re: [PATCH net] net: dsa: mt7530: correct ds->num_ports

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:

On Sat, 16 Oct 2021 14:24:14 +0800 you wrote:
> Setting ds->num_ports to DSA_MAX_PORTS made DSA core allocate unnecessary
> dsa_port's and call mt7530_port_disable for non-existent ports.
> 
> Set it to MT7530_NUM_PORTS to fix that, and dsa_is_user_port check in
> port_enable/disable is no longer required.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: DENG Qingfang <dqfext@gmail.com>
> 
> [...]

Here is the summary with links:
  - [net] net: dsa: mt7530: correct ds->num_ports
    https://git.kernel.org/netdev/net/c/342afce10d6f

You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [PATCH net] net: dsa: mt7530: correct ds->num_ports

[Florian Fainelli]

On 10/18/21 1:42 AM, DENG Qingfang wrote:
> On Sat, Oct 16, 2021 at 07:36:14PM -0700, Florian Fainelli wrote:
>> On 10/15/2021 11:24 PM, DENG Qingfang wrote:
>>> Setting ds->num_ports to DSA_MAX_PORTS made DSA core allocate unnecessary
>>> dsa_port's and call mt7530_port_disable for non-existent ports.
>>>
>>> Set it to MT7530_NUM_PORTS to fix that, and dsa_is_user_port check in
>>> port_enable/disable is no longer required.
>>>
>>> Cc: stable@vger.kernel.org
>>> Signed-off-by: DENG Qingfang <dqfext@gmail.com>
>>
>> Do you really want to target the net tree for this change?
> 
> Yes because I consider this a bug fix.


OK, why not provide a Fixes tag to help with targeting the back port
then? This has been applied anyway, so hopefully the auto selection will
do its job and tell you where it stops applying cleanly.
-- 
Florian

Re: [PATCH net] net: dsa: mt7530: correct ds->num_ports

[Greg KH]

On Mon, Oct 18, 2021 at 09:22:49AM -0700, Florian Fainelli wrote:
> On 10/18/21 1:42 AM, DENG Qingfang wrote:
> > On Sat, Oct 16, 2021 at 07:36:14PM -0700, Florian Fainelli wrote:
> >> On 10/15/2021 11:24 PM, DENG Qingfang wrote:
> >>> Setting ds->num_ports to DSA_MAX_PORTS made DSA core allocate unnecessary
> >>> dsa_port's and call mt7530_port_disable for non-existent ports.
> >>>
> >>> Set it to MT7530_NUM_PORTS to fix that, and dsa_is_user_port check in
> >>> port_enable/disable is no longer required.
> >>>
> >>> Cc: stable@vger.kernel.org
> >>> Signed-off-by: DENG Qingfang <dqfext@gmail.com>
> >>
> >> Do you really want to target the net tree for this change?
> > 
> > Yes because I consider this a bug fix.
> 
> 
> OK, why not provide a Fixes tag to help with targeting the back port
> then? This has been applied anyway, so hopefully the auto selection will
> do its job and tell you where it stops applying cleanly.

Without a "Fixes:" tag, I just backport things as far are they are easy
to go and then stop without an email saying anything fails on older
kernels.

thanks,

greg k-h