linux-kernel - [PATCH 5.15 053/135] net/mlx5: Fix deadlock in sync reset flow

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Date:   Tue, 10 May 2022 15:07:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Moshe Shemesh <moshe@...dia.com>,
        Maher Sanalla <msanalla@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [PATCH 5.15 053/135] net/mlx5: Fix deadlock in sync reset flow

From: Moshe Shemesh <moshe@...dia.com>

commit cb7786a76ea39f394f0a059787fe24fa8e340fb6 upstream.

The sync reset flow can lead to the following deadlock when
poll_sync_reset() is called by timer softirq and waiting on
del_timer_sync() for the same timer. Fix that by moving the part of the
flow that waits for the timer to reset_reload_work.

It fixes the following kernel Trace:
RIP: 0010:del_timer_sync+0x32/0x40
...
Call Trace:
 <IRQ>
 mlx5_sync_reset_clear_reset_requested+0x26/0x50 [mlx5_core]
 poll_sync_reset.cold+0x36/0x52 [mlx5_core]
 call_timer_fn+0x32/0x130
 __run_timers.part.0+0x180/0x280
 ? tick_sched_handle+0x33/0x60
 ? tick_sched_timer+0x3d/0x80
 ? ktime_get+0x3e/0xa0
 run_timer_softirq+0x2a/0x50
 __do_softirq+0xe1/0x2d6
 ? hrtimer_interrupt+0x136/0x220
 irq_exit+0xae/0xb0
 smp_apic_timer_interrupt+0x7b/0x140
 apic_timer_interrupt+0xf/0x20
 </IRQ>

Fixes: 3c5193a87b0f ("net/mlx5: Use del_timer_sync in fw reset flow of halting poll")
Signed-off-by: Moshe Shemesh <moshe@...dia.com>
Reviewed-by: Maher Sanalla <msanalla@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c |   34 ++++++++++-----------
 1 file changed, 17 insertions(+), 17 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
@@ -111,22 +111,6 @@ static void mlx5_fw_reset_complete_reloa
 	}
 }
 
-static void mlx5_sync_reset_reload_work(struct work_struct *work)
-{
-	struct mlx5_fw_reset *fw_reset = container_of(work, struct mlx5_fw_reset,
-						      reset_reload_work);
-	struct mlx5_core_dev *dev = fw_reset->dev;
-	int err;
-
-	mlx5_enter_error_state(dev, true);
-	mlx5_unload_one(dev);
-	err = mlx5_health_wait_pci_up(dev);
-	if (err)
-		mlx5_core_err(dev, "reset reload flow aborted, PCI reads still not working\n");
-	fw_reset->ret = err;
-	mlx5_fw_reset_complete_reload(dev);
-}
-
 static void mlx5_stop_sync_reset_poll(struct mlx5_core_dev *dev)
 {
 	struct mlx5_fw_reset *fw_reset = dev->priv.fw_reset;
@@ -149,6 +133,23 @@ static int mlx5_sync_reset_clear_reset_r
 	return 0;
 }
 
+static void mlx5_sync_reset_reload_work(struct work_struct *work)
+{
+	struct mlx5_fw_reset *fw_reset = container_of(work, struct mlx5_fw_reset,
+						      reset_reload_work);
+	struct mlx5_core_dev *dev = fw_reset->dev;
+	int err;
+
+	mlx5_sync_reset_clear_reset_requested(dev, false);
+	mlx5_enter_error_state(dev, true);
+	mlx5_unload_one(dev);
+	err = mlx5_health_wait_pci_up(dev);
+	if (err)
+		mlx5_core_err(dev, "reset reload flow aborted, PCI reads still not working\n");
+	fw_reset->ret = err;
+	mlx5_fw_reset_complete_reload(dev);
+}
+
 #define MLX5_RESET_POLL_INTERVAL	(HZ / 10)
 static void poll_sync_reset(struct timer_list *t)
 {
@@ -163,7 +164,6 @@ static void poll_sync_reset(struct timer
 
 	if (fatal_error) {
 		mlx5_core_warn(dev, "Got Device Reset\n");
-		mlx5_sync_reset_clear_reset_requested(dev, false);
 		queue_work(fw_reset->wq, &fw_reset->reset_reload_work);
 		return;
 	}