[PATCH net-next 1/2] net: stmmac: remove redundant racy tear-down in stmmac_dvr_remove()

[PATCH net-next 1/2] net: stmmac: remove redundant racy tear-down in stmmac_dvr_remove()

[Russell King (Oracle)]

While the network device is registered, it is published to userspace,
and thus userspace can change its state. This means calling
functions such as stmmac_stop_all_dma() and stmmac_mac_set() are
racy.

Moreover, unregister_netdev() will unpublish the network device, and
then if appropriate call the .ndo_stop() method, which is
stmmac_release(). This will first call phylink_stop() which will
synchronously take the link down, resulting in stmmac_mac_link_down()
and stmmac_mac_set(, false) being called.

stmmac_release() will also call stmmac_stop_all_dma().

Consequently, neither of these two functions need to called prior
to unregister_netdev() as that will safely call paths that will
result in this work being done if necessary.

Remove these redundant racy calls.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Furong Xu <0x1207@gmail.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index fa1d7d3a2f43..c2ee6c0af3fd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7768,8 +7768,6 @@ void stmmac_dvr_remove(struct device *dev)
 
 	pm_runtime_get_sync(dev);
 
-	stmmac_stop_all_dma(priv);
-	stmmac_mac_set(priv, priv->ioaddr, false);
 	unregister_netdev(ndev);
 
 #ifdef CONFIG_DEBUG_FS
-- 
2.30.2

[PATCH net-next 2/2] net: stmmac: remove unnecessary stmmac_mac_set() in stmmac_release()

[Russell King (Oracle)]

stmmac_release() calls phylink_stop() and then goes on to call
stmmac_mac_set(, false). However, phylink_stop() will call
stmmac_mac_link_down() before returning, which will do this work.
Remove this unnecessary call.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Furong Xu <0x1207@gmail.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c2ee6c0af3fd..839ecebf5f5f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4129,9 +4129,6 @@ static int stmmac_release(struct net_device *dev)
 	/* Release and free the Rx/Tx resources */
 	free_dma_desc_resources(priv, &priv->dma_conf);
 
-	/* Disable the MAC Rx/Tx */
-	stmmac_mac_set(priv, priv->ioaddr, false);
-
 	/* Powerdown Serdes if there is */
 	if (priv->plat->serdes_powerdown)
 		priv->plat->serdes_powerdown(dev, priv->plat->bsp_priv);
-- 
2.30.2

[PATCH net-next 0/2] net: stmmac: avoid unnecessary work in stmmac_release()/stmmac_dvr_remove()

[Russell King (Oracle)]

Hi,

This small series is a subset of a RFC I sent earlier. These two
patches remove code that is unnecessary and/or wrong in these paths.
Details in each commit.

 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 -----
 1 file changed, 5 deletions(-)

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Re: [PATCH net-next 0/2] net: stmmac: avoid unnecessary work in stmmac_release()/stmmac_dvr_remove()

[Russell King (Oracle)]

On Mon, Mar 10, 2025 at 12:31:32PM +0000, Russell King (Oracle) wrote:
> Hi,
> 
> This small series is a subset of a RFC I sent earlier. These two
> patches remove code that is unnecessary and/or wrong in these paths.
> Details in each commit.
> 
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 -----
>  1 file changed, 5 deletions(-)

Hi Jakub,

Why is this series showing in patchwork, but not being subjected to
any nipabot tests?

There's also "net: phylink: expand on .pcs_config() method
documentation" which isn't being subjected to nipabot tests.

Thanks.

-- 
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Re: [PATCH net-next 0/2] net: stmmac: avoid unnecessary work in stmmac_release()/stmmac_dvr_remove()

[Paolo Abeni]

On 3/13/25 9:12 AM, Russell King (Oracle) wrote:
> On Mon, Mar 10, 2025 at 12:31:32PM +0000, Russell King (Oracle) wrote:
>> Hi,
>>
>> This small series is a subset of a RFC I sent earlier. These two
>> patches remove code that is unnecessary and/or wrong in these paths.
>> Details in each commit.
>>
>>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 -----
>>  1 file changed, 5 deletions(-)
> 
> Hi Jakub,
> 
> Why is this series showing in patchwork, but not being subjected to
> any nipabot tests?
> 
> There's also "net: phylink: expand on .pcs_config() method
> documentation" which isn't being subjected to nipabot tests.

We had an outage in the nipa infra that caused no test running for a
while. At least it entered later CI runs.

Cheers,

Paolo

Re: [PATCH net-next 0/2] net: stmmac: avoid unnecessary work in stmmac_release()/stmmac_dvr_remove()

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Mon, 10 Mar 2025 12:31:32 +0000 you wrote:
> Hi,
> 
> This small series is a subset of a RFC I sent earlier. These two
> patches remove code that is unnecessary and/or wrong in these paths.
> Details in each commit.
> 
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 -----
>  1 file changed, 5 deletions(-)

Here is the summary with links:
  - [net-next,1/2] net: stmmac: remove redundant racy tear-down in stmmac_dvr_remove()
    https://git.kernel.org/netdev/net-next/c/180fa8d0a2cb
  - [net-next,2/2] net: stmmac: remove unnecessary stmmac_mac_set() in stmmac_release()
    https://git.kernel.org/netdev/net-next/c/39b0a10d80d6

You are awesome, thank you!
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