netdev - Re: [PATCH] net: stmmac: Do not enable/disable runtime PM for PCI devices

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Date: Thu, 21 Mar 2024 16:04:22 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Mikhail Malyshev <mike.malyshev@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>, netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: stmmac: Do not enable/disable runtime PM for PCI
 devices

Thu, Mar 21, 2024 at 02:54:15PM CET, mike.malyshev@...il.com wrote:
>Common function stmmac_dvr_probe is called for both PCI and non-PCI
>device. For PCI devices pm_runtime_enable/disable are called by framework
>and should not be called by the driver.

I don't follow. The rest of the pm_runtime* functions are okay to call,
but enable() is not. Why? You need to provide more reasoning.


>
>For PCI devices plat->pdev != NULL. Use this fact to detect PCI devices

Sentence ends with "."

I assume this is a bug fix. Do you have a trace or some other symptoms?
Please add it to the patch description. You also need to add "Fixes"
tag.

Make sure you read:
https://www.kernel.org/doc/html/next/process/maintainer-netdev.html?highlight=network#tl-dr

Thanks

pw-bot: cr


>
>Signed-off-by: Mikhail Malyshev <mike.malyshev@...il.com>
>---
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>index 24cd80490d19..db45d8dbc1eb 100644
>--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>@@ -7743,7 +7743,9 @@ int stmmac_dvr_probe(struct device *device,
> 
> 	pm_runtime_get_noresume(device);
> 	pm_runtime_set_active(device);
>-	if (!pm_runtime_enabled(device))
>+
>+	/* For PCI devices PM is disabled/enabled by the framework */
>+	if (!priv->plat->pdev)
> 		pm_runtime_enable(device);
> 
> 	if (priv->hw->pcs != STMMAC_PCS_TBI &&
>@@ -7846,7 +7848,10 @@ void stmmac_dvr_remove(struct device *dev)
> 	mutex_destroy(&priv->lock);
> 	bitmap_free(priv->af_xdp_zc_qps);
> 
>-	pm_runtime_disable(dev);
>+	/* For PCI devices PM is disabled/enabled by the framework */
>+	if (!priv->plat->pdev)
>+		pm_runtime_disable(dev);
>+
> 	pm_runtime_put_noidle(dev);
> }
> EXPORT_SYMBOL_GPL(stmmac_dvr_remove);
>
>---
>base-commit: 23956900041d968f9ad0f30db6dede4daccd7aa9
>change-id: 20240321-stmmac-fix-f506d52882d2
>
>Best regards,
>-- 
>Mikhail Malyshev <mike.malyshev@...il.com>
>
>