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net: atl1e: fix soft lockup on out-of-range hw_next_to_clean read

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Same issue as atl1c (see the first commit in this series, "net:
atl1c: fix soft lockup on out-of-range tpd_cons read"): the hardware
can report an out-of-range hw_next_to_clean (seen as 0xffff) while
the PCIe link/MAC is resetting. An out-of-range value can never be
reached and the loop below would spin forever. Treat it as "nothing
new to clean" instead.

Fixes: a6a5325239 ("atl1e: Atheros L1E Gigabit Ethernet driver")
Cc: stable@vger.kernel.org
Signed-off-by: Gajdos Tamás <tamas@rimpianto.com>
Link: https://patch.msgid.link/20260921091334.3571525-3-tamas@rimpianto.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Gajdos Tamás 2026-09-21 11:13:33 +02:00 committed by Paolo Abeni
parent 36c2009d90
commit 374bf9e4b9
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/atheros/atl1e/atl1e_main.c
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@ -1234,6 +1234,9 @@ static bool atl1e_clean_tx_irq(struct atl1e_adapter *adapter)
u16 hw_next_to_clean = AT_READ_REGW(&adapter->hw, REG_TPD_CONS_IDX);
u16 next_to_clean = atomic_read(&tx_ring->next_to_clean);
if (unlikely(hw_next_to_clean >= tx_ring->count))
hw_next_to_clean = next_to_clean;
while (next_to_clean != hw_next_to_clean) {
tx_buffer = &tx_ring->tx_buffer[next_to_clean];
if (tx_buffer->dma) {