net: ll_temac: Fix race condition causing TX hang

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It is possible that the interrupt handler fires and frees up space in
the TX ring in between checking for sufficient TX ring space and
stopping the TX queue in temac_start_xmit. If this happens, the
queue wake from the interrupt handler will occur before the queue is
stopped, causing a lost wakeup and the adapter's transmit hanging.

To avoid this, after stopping the queue, check again whether there is
sufficient space in the TX ring. If so, wake up the queue again.

This is a port of the similar fix in axienet driver,
commit 7de44285c1 ("net: axienet: Fix race condition causing TX hang").

Fixes: 23ecc4bde2 ("net: ll_temac: fix checksum offload logic")
Signed-off-by: Esben Haabendal <esben@geanix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Esben Haabendal 2020-02-21 07:47:21 +01:00 • committed by David S. Miller

parent 6132c1d903

commit 84823ff80f

1 changed files with 16 additions and 3 deletions

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19

drivers/net/ethernet/xilinx/ll_temac_main.c

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