On Mon, May 13, 2024 at 04:39:22PM +0200, Ronald Wahl wrote:
From: Ronald Wahl ronald.wahl@raritan.com
Under some circumstances it may happen that the ks8851 Ethernet driver stops sending data.
Currently the interrupt handler resets the interrupt status flags in the hardware after handling TX. With this approach we may lose interrupts in the time window between handling the TX interrupt and resetting the TX interrupt status bit.
When all of the three following conditions are true then transmitting data stops:
- TX queue is stopped to wait for room in the hardware TX buffer
- no queued SKBs in the driver (txq) that wait for being written to hw
- hardware TX buffer is empty and the last TX interrupt was lost
This is because reenabling the TX queue happens when handling the TX interrupt status but if the TX status bit has already been cleared then this interrupt will never come.
With this commit the interrupt status flags will be cleared before they are handled. That way we stop losing interrupts.
The wrong handling of the ISR flags was there from the beginning but with commit 3dc5d4454545 ("net: ks8851: Fix TX stall caused by TX buffer overrun") the issue becomes apparent.
Fixes: 3dc5d4454545 ("net: ks8851: Fix TX stall caused by TX buffer overrun") Cc: "David S. Miller" davem@davemloft.net Cc: Eric Dumazet edumazet@google.com Cc: Jakub Kicinski kuba@kernel.org Cc: Paolo Abeni pabeni@redhat.com Cc: Simon Horman horms@kernel.org Cc: netdev@vger.kernel.org Cc: stable@vger.kernel.org # 5.10+ Signed-off-by: Ronald Wahl ronald.wahl@raritan.com
Reviewed-by: Simon Horman horms@kernel.org