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net: macb: ensure the device is available before accessing GEMGXL control registers

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[ 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 (7fa2955ff7 ("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>
This commit is contained in:
Zong Li 2021-05-22 17:16:11 +08:00 committed by Greg Kroah-Hartman
parent bbb48789b6
commit a385cbf31e
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/cadence/macb_main.c
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@ -2709,6 +2709,9 @@ 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 +