netdev - [PATCH net] net/mlx5: Avoid MMIO when the error is detected

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Message-Id: <20230807083205.18557-1-ganeshgr@linux.ibm.com>
Date: Mon,  7 Aug 2023 14:02:05 +0530
From: Ganesh Goudar <ganeshgr@...ux.ibm.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, moshe@...dia.com, leon@...nel.org,
        mahesh@...ux.ibm.com, oohall@...il.com,
        Ganesh Goudar <ganeshgr@...ux.ibm.com>
Subject: [PATCH net] net/mlx5: Avoid MMIO when the error is detected

When the drivers are notfied about the pci error, All
the IO to the card must be stopped, Else the recovery would
fail, Avoid memory-mapped IO until the device recovers
from pci error.

Signed-off-by: Ganesh Goudar <ganeshgr@...ux.ibm.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index 932fbc843c69..010dee4eec14 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -221,10 +221,13 @@ static void mlx5_timestamp_overflow(struct work_struct *work)
 	clock = container_of(timer, struct mlx5_clock, timer);
 	mdev = container_of(clock, struct mlx5_core_dev, clock);
 
+	if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)
+		goto out;
 	write_seqlock_irqsave(&clock->lock, flags);
 	timecounter_read(&timer->tc);
 	mlx5_update_clock_info_page(mdev);
 	write_sequnlock_irqrestore(&clock->lock, flags);
+out:
 	schedule_delayed_work(&timer->overflow_work, timer->overflow_period);
 }
 
-- 
2.40.1