[PATCH 5.4 23/84] net: macb: ensure the device is available before accessing GEMGXL control registers

Greg Kroah-Hartman
2021-06-14T10:58:45Z

From: Zong Li <zong.li@sifive.com>

[ Upstream commit 5eff1461a6dec84f04fafa9128548bad51d96147 ]

If runtime power menagement is enabled, the gigabit ethernet PLL would
be disabled after macb_probe(). During this period of time, the system
would hang up if we try to access GEMGXL control registers.

We can't put runtime_pm_get/runtime_pm_put/ there due to the issue of
sleep inside atomic section (7fa2955ff70ce453 ("sh_eth: Fix sleeping
function called from invalid context"). Add netif_running checking to
ensure the device is available before accessing GEMGXL device.

Changed in v2:
- Use netif_running instead of its own flag

Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/cadence/macb_main.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 377668465535..ebd0853a6f31 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -2536,6 +2536,9 @@ static struct net_device_stats *gem_get_stats(struct macb *bp)
struct gem_stats *hwstat = &bp->hw_stats.gem;
struct net_device_stats *nstat = &bp->dev->stats;

+ if (!netif_running(bp->dev))
+ return nstat;
+
gem_update_stats(bp);

nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
--
2.30.2