From: Jakub Kicinski <kuba@kernel.org>
To: Yan Wang <rk.code@outlook.com>
Cc: davem@davemloft.net, edumazet@google.com, pabeni@redhat.com,
mcoquelin.stm32@gmail.com,
Giuseppe Cavallaro <peppe.cavallaro@st.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Jose Abreu <joabreu@synopsys.com>,
Joakim Zhang <qiangqing.zhang@nxp.com>,
netdev@vger.kernel.org (open list:STMMAC ETHERNET DRIVER),
linux-stm32@st-md-mailman.stormreply.com (moderated
list:ARM/STM32 ARCHITECTURE),
linux-arm-kernel@lists.infradead.org (moderated list:ARM/STM32
ARCHITECTURE), linux-kernel@vger.kernel.org (open list)
Subject: Re: [PATCH net-next v3] net: stmmac:fix system hang when setting up tag_8021q VLAN for DSA ports
Date: Thu, 13 Apr 2023 22:00:46 -0700 [thread overview]
Message-ID: <20230413220046.267fdc31@kernel.org> (raw)
In-Reply-To: <KL1PR01MB544872920F00149E3BDDC7ECE6999@KL1PR01MB5448.apcprd01.prod.exchangelabs.com>
On Fri, 14 Apr 2023 11:07:10 +0800 Yan Wang wrote:
> The system hang because of dsa_tag_8021q_port_setup()->
> stmmac_vlan_rx_add_vid().
>
> I found in stmmac_drv_probe() that cailing pm_runtime_put()
> disabled the clock.
>
> First, when the kernel is compiled with CONFIG_PM=y,The stmmac's
> resume/suspend is active.
>
> Secondly,stmmac as DSA master,the dsa_tag_8021q_port_setup() function
> will callback stmmac_vlan_rx_add_vid when DSA dirver starts. However,
> The system is hanged for the stmmac_vlan_rx_add_vid() accesses its
> registers after stmmac's clock is closed.
>
> I would suggest adding the pm_runtime_resume_and_get() to the
> stmmac_vlan_rx_add_vid().This guarantees that resuming clock output
> while in use.
>
> Fixes: b3dcb3127786 ("net: stmmac: correct clocks enabled in stmmac_vlan_rx_kill_vid()")
> Signed-off-by: Yan Wang <rk.code@outlook.com>
Happy to see you managed to work around the email server problems!
Please make sure to read this doc before posting the next version:
https://www.kernel.org/doc/html/next/process/maintainer-netdev.html
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WARNING: multiple messages have this Message-ID (diff)
From: Jakub Kicinski <kuba@kernel.org>
To: Yan Wang <rk.code@outlook.com>
Cc: davem@davemloft.net, edumazet@google.com, pabeni@redhat.com,
mcoquelin.stm32@gmail.com,
Giuseppe Cavallaro <peppe.cavallaro@st.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Jose Abreu <joabreu@synopsys.com>,
Joakim Zhang <qiangqing.zhang@nxp.com>,
netdev@vger.kernel.org (open list:STMMAC ETHERNET DRIVER),
linux-stm32@st-md-mailman.stormreply.com (moderated
list:ARM/STM32 ARCHITECTURE),
linux-arm-kernel@lists.infradead.org (moderated list:ARM/STM32
ARCHITECTURE), linux-kernel@vger.kernel.org (open list)
Subject: Re: [PATCH net-next v3] net: stmmac:fix system hang when setting up tag_8021q VLAN for DSA ports
Date: Thu, 13 Apr 2023 22:00:46 -0700 [thread overview]
Message-ID: <20230413220046.267fdc31@kernel.org> (raw)
In-Reply-To: <KL1PR01MB544872920F00149E3BDDC7ECE6999@KL1PR01MB5448.apcprd01.prod.exchangelabs.com>
On Fri, 14 Apr 2023 11:07:10 +0800 Yan Wang wrote:
> The system hang because of dsa_tag_8021q_port_setup()->
> stmmac_vlan_rx_add_vid().
>
> I found in stmmac_drv_probe() that cailing pm_runtime_put()
> disabled the clock.
>
> First, when the kernel is compiled with CONFIG_PM=y,The stmmac's
> resume/suspend is active.
>
> Secondly,stmmac as DSA master,the dsa_tag_8021q_port_setup() function
> will callback stmmac_vlan_rx_add_vid when DSA dirver starts. However,
> The system is hanged for the stmmac_vlan_rx_add_vid() accesses its
> registers after stmmac's clock is closed.
>
> I would suggest adding the pm_runtime_resume_and_get() to the
> stmmac_vlan_rx_add_vid().This guarantees that resuming clock output
> while in use.
>
> Fixes: b3dcb3127786 ("net: stmmac: correct clocks enabled in stmmac_vlan_rx_kill_vid()")
> Signed-off-by: Yan Wang <rk.code@outlook.com>
Happy to see you managed to work around the email server problems!
Please make sure to read this doc before posting the next version:
https://www.kernel.org/doc/html/next/process/maintainer-netdev.html
next prev parent reply other threads:[~2023-04-14 5:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-14 3:07 [PATCH net-next v3] net: stmmac:fix system hang when setting up tag_8021q VLAN for DSA ports Yan Wang
2023-04-14 3:07 ` Yan Wang
2023-04-14 5:00 ` Jakub Kicinski [this message]
2023-04-14 5:00 ` Jakub Kicinski
2023-04-17 14:11 ` [PATCH net-next v5] " Yan Wang
2023-04-17 14:11 ` Yan Wang
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