SFP device polling can cause problems during the shutdown process if the
parent devices of the network controller have been shut down already.
This problem was seen on the iMX6 platform with PCIe devices, where
accessing the device after the bus is shut down causes a hang.

Stop all delayed work in the SFP driver during the shutdown process to
avoid this problem.

Signed-off-by: Robert Hancock <redacted>
---
 drivers/net/phy/sfp.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 554acc8..6b6c83d 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c

@@ -1928,9 +1928,18 @@ static int sfp_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void sfp_shutdown(struct platform_device *pdev)
+{
+	struct sfp *sfp = platform_get_drvdata(pdev);
+
+	cancel_delayed_work_sync(&sfp->poll);
+	cancel_delayed_work_sync(&sfp->timeout);
+}
+
 static struct platform_driver sfp_driver = {
 	.probe = sfp_probe,
 	.remove = sfp_remove,
+	.shutdown = sfp_shutdown,
 	.driver = {
 		.name = "sfp",
 		.of_match_table = sfp_of_match,

-- 
1.8.3.1