bnxt_en: Unregister PTP during PCI shutdown and suspend

jira LE-2522
Rebuild_History Non-Buildable kernel-5.14.0-503.29.1.el9_5
commit-author Michael Chan <[email protected]>
commit 3661c05

If we go through the PCI shutdown or suspend path, we shutdown the
NIC but PTP remains registered.  If the kernel continues to run for
a little bit, the periodic PTP .do_aux_work() function may be called
and it will read the PHC from the BAR register.  Since the device
has already been disabled, it will cause a PCIe completion timeout.
Fix it by calling bnxt_ptp_clear() in the PCI shutdown/suspend
handlers.  bnxt_ptp_clear() will unregister from PTP and
.do_aux_work() will be canceled.

In bnxt_resume(), we need to re-initialize PTP.

Fixes: a521c8a ("bnxt_en: Move bnxt_ptp_init() from bnxt_open() back to bnxt_init_one()")
	Cc: Richard Cochran <[email protected]>
	Reviewed-by: Somnath Kotur <[email protected]>
	Reviewed-by: Pavan Chebbi <[email protected]>
	Reviewed-by: Kalesh AP <[email protected]>
	Signed-off-by: Michael Chan <[email protected]>
	Signed-off-by: Paolo Abeni <[email protected]>

(cherry picked from commit 3661c05)
	Signed-off-by: Jonathan Maple <[email protected]>

Author: PlaidCat

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -14552,6 +14552,7 @@ static void bnxt_shutdown(struct pci_dev *pdev)
 	if (netif_running(dev))
 		dev_close(dev);
 
+	bnxt_ptp_clear(bp);
 	bnxt_clear_int_mode(bp);
 	pci_disable_device(pdev);
 
@@ -14578,6 +14579,7 @@ static int bnxt_suspend(struct device *device)
 		rc = bnxt_close(dev);
 	}
 	bnxt_hwrm_func_drv_unrgtr(bp);
+	bnxt_ptp_clear(bp);
 	pci_disable_device(bp->pdev);
 	bnxt_free_ctx_mem(bp);
 	rtnl_unlock();
@@ -14619,6 +14621,10 @@ static int bnxt_resume(struct device *device)
 		goto resume_exit;
 	}
 
+	if (bnxt_ptp_init(bp)) {
+		kfree(bp->ptp_cfg);
+		bp->ptp_cfg = NULL;
+	}
 	bnxt_get_wol_settings(bp);
 	if (netif_running(dev)) {
 		rc = bnxt_open(dev);