[lkml]   [2021]   [Jun]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH AUTOSEL 5.12 31/43] net: macb: ensure the device is available before accessing GEMGXL control registers
From: Zong Li <>

[ 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 <>
Signed-off-by: David S. Miller <>
Signed-off-by: Sasha Levin <>
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 0f6a6cb7e98d..51b19172d63b 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -2837,6 +2837,9 @@ 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;

nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
 \ /
  Last update: 2021-06-03 19:11    [W:0.216 / U:0.584 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site