linux-kernel - RE: [PATCH] PCI: imx6: Add deinit for imx pci

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Date:   Wed, 5 Jul 2023 02:33:42 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     Xiaolei Wang <xiaolei.wang@...driver.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "kw@...ux.com" <kw@...ux.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] PCI: imx6: Add deinit for imx pci

Hi Xiaolei:
Thanks for your patch.
The similar issue had been fixed by another mail-loop.
Issued by Mark and Fabio.
https://lkml.org/lkml/2023/7/3/816
https://patchwork.kernel.org/project/linux-pci/patch/20230704122635.1362156-1-festevam@gmail.com/

Best Regards
Richard Zhu

> -----Original Message-----
> From: Xiaolei Wang <xiaolei.wang@...driver.com>
> Sent: 2023年7月5日 9:06
> To: Hongxing Zhu <hongxing.zhu@....com>; l.stach@...gutronix.de;
> kw@...ux.com; bhelgaas@...gle.com; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
> dl-linux-imx <linux-imx@....com>
> Cc: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org
> Subject: [PATCH] PCI: imx6: Add deinit for imx pci
> 
> Commit da56a1bfbab5("PCI: dwc: Wait for link up only if link is started") adds
> the judgment on the return value of dw_pcie_wait_for_link(). When no pci
> device is connected and pci does not appear link up, the link will be stopped at
> this time. Run host_deinit, so add host_deinit callback function.
> 
>   WARNING: CPU: 2 PID: 70 at drivers/regulator/core.c:2398
> _regulator_put.part.0+0x17c/0x194
>   Modules linked in:
>   CPU: 2 PID: 70 Comm: kworker/u8:4 Not tainted
> 6.4.0-rc1-00001-gda56a1bfbab5-dirty #22
>   Hardware name: NXP i.MX8MQ EVK (DT)
>     Call trace:
>     _regulator_put.part.0+0x17c/0x194
>     regulator_put+0x3c/0x54
>     devm_regulator_release+0x14/0x20
>     release_nodes+0x8c/0x13c
>     devres_release_all+0x8c/0x108
>     device_unbind_cleanup+0x18/0x68
>     really_probe+0xe4/0x27c
>     __driver_probe_device+0x78/0x12c
>     driver_probe_device+0x3c/0x118
>     __device_attach_driver+0xb8/0xf8
>     bus_for_each_drv+0x84/0xe4
>     __device_attach_async_helper+0xc0/0xe4
>     async_run_entry_fn+0x34/0xe0
>     process_one_work+0x290/0x5c4
>     worker_thread+0x4c/0x408
>     kthread+0x128/0x134
>     ret_from_fork+0x10/0x20
> 
> Signed-off-by: Xiaolei Wang <xiaolei.wang@...driver.com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> b/drivers/pci/controller/dwc/pci-imx6.c
> index 52906f999f2b..e4942bd2598d 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1039,6 +1039,7 @@ static void imx6_pcie_host_exit(struct dw_pcie_rp
> *pp)
> 
>  static const struct dw_pcie_host_ops imx6_pcie_host_ops = {
>  	.host_init = imx6_pcie_host_init,
> +	.host_deinit = imx6_pcie_host_exit,
>  };
> 
>  static const struct dw_pcie_ops dw_pcie_ops = {
> --
> 2.25.1