This is a note to let you know that I've just added the patch titled

qed: Fix interrupt flags on Rx LL2

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: qed-fix-interrupt-flags-on-rx-ll2.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Mon Dec 18 14:12:34 CET 2017

From: Ram Amrani Ram.Amrani@cavium.com Date: Tue, 14 Mar 2017 15:26:02 +0200 Subject: qed: Fix interrupt flags on Rx LL2

From: Ram Amrani Ram.Amrani@cavium.com

[ Upstream commit 1df2adedcce17ad4a39fba74f0e2b611f797fe10 ]

Before iterating over the the LL2 Rx ring, the ring's spinlock is taken via spin_lock_irqsave(). The actual processing of the packet [including handling by the protocol driver] is done without said lock, so qed releases the spinlock and re-claims it afterwards.

Problem is that the final spin_lock_irqrestore() at the end of the iteration uses the original flags saved from the initial irqsave() instead of the flags from the most recent irqsave(). So it's possible that the interrupt status would be incorrect at the end of the processing.

Fixes: 0a7fb11c23c0 ("qed: Add Light L2 support"); CC: Ram Amrani Ram.Amrani@cavium.com Signed-off-by: Yuval Mintz Yuval.Mintz@cavium.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/qlogic/qed/qed_ll2.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.c +++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.c @@ -443,7 +443,7 @@ qed_ll2_rxq_completion_gsi(struct qed_hw static int qed_ll2_rxq_completion_reg(struct qed_hwfn *p_hwfn, struct qed_ll2_info *p_ll2_conn, union core_rx_cqe_union *p_cqe, - unsigned long lock_flags, + unsigned long *p_lock_flags, bool b_last_cqe) { struct qed_ll2_rx_queue *p_rx = &p_ll2_conn->rx_queue; @@ -464,10 +464,10 @@ static int qed_ll2_rxq_completion_reg(st "Mismatch between active_descq and the LL2 Rx chain\n"); list_add_tail(&p_pkt->list_entry, &p_rx->free_descq);

- spin_unlock_irqrestore(&p_rx->lock, lock_flags); + spin_unlock_irqrestore(&p_rx->lock, *p_lock_flags); qed_ll2b_complete_rx_packet(p_hwfn, p_ll2_conn->my_id, p_pkt, &p_cqe->rx_cqe_fp, b_last_cqe); - spin_lock_irqsave(&p_rx->lock, lock_flags); + spin_lock_irqsave(&p_rx->lock, *p_lock_flags);

return 0; } @@ -507,7 +507,8 @@ static int qed_ll2_rxq_completion(struct break; case CORE_RX_CQE_TYPE_REGULAR: rc = qed_ll2_rxq_completion_reg(p_hwfn, p_ll2_conn, - cqe, flags, b_last_cqe); + cqe, &flags, + b_last_cqe); break; default: rc = -EIO;

Patches currently in stable-queue which might be from Ram.Amrani@cavium.com are

queue-4.9/qed-fix-interrupt-flags-on-rx-ll2.patch queue-4.9/qed-align-cids-according-to-dorq-requirement.patch