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

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Date:   Wed,  5 Jul 2023 09:06:24 +0800
From:   Xiaolei Wang <xiaolei.wang@...driver.com>
To:     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, 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