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

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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>

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Zong Li 2021-05-22 17:16:11 +08:00 • committed by David S. Miller

parent ad79fd2c42

commit 5eff1461a6

1 changed files with 3 additions and 0 deletions

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drivers/net/ethernet/cadence/macb_main.c

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