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net/mlx5: Free IRQ rmap and notifier on kernel shutdown
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commit 314ded5 upstream.

The kernel IRQ system needs the irq affinity notifier to be clear
before attempting to free the irq, see WARN_ON log below.

On a normal driver unload we don't have this issue since we do the
complete cleanup of the irq resources.

To fix this, put the important resources cleanup in a helper function
and use it in both normal driver unload and shutdown flows.

[ 4497.498434] ------------[ cut here ]------------
[ 4497.498726] WARNING: CPU: 0 PID: 9 at kernel/irq/manage.c:2034 free_irq+0x295/0x340
[ 4497.499193] Modules linked in:
[ 4497.499386] CPU: 0 PID: 9 Comm: kworker/0:1 Tainted: G        W          6.4.0-rc4+ Freescale#10
[ 4497.499876] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014
[ 4497.500518] Workqueue: events do_poweroff
[ 4497.500849] RIP: 0010:free_irq+0x295/0x340
[ 4497.501132] Code: 85 c0 0f 84 1d ff ff ff 48 89 ef ff d0 0f 1f 00 e9 10 ff ff ff 0f 0b e9 72 ff ff ff 49 8d 7f 28 ff d0 0f 1f 00 e9 df fd ff ff <0f> 0b 48 c7 80 c0 008
[ 4497.502269] RSP: 0018:ffffc90000053da0 EFLAGS: 00010282
[ 4497.502589] RAX: ffff888100949600 RBX: ffff88810330b948 RCX: 0000000000000000
[ 4497.503035] RDX: ffff888100949600 RSI: ffff888100400490 RDI: 0000000000000023
[ 4497.503472] RBP: ffff88810330c7e0 R08: ffff8881004005d0 R09: ffffffff8273a260
[ 4497.503923] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881009ae000
[ 4497.504359] R13: ffff8881009ae148 R14: 0000000000000000 R15: ffff888100949600
[ 4497.504804] FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
[ 4497.505302] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4497.505671] CR2: 00007fce98806298 CR3: 000000000262e005 CR4: 0000000000370ef0
[ 4497.506104] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4497.506540] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4497.507002] Call Trace:
[ 4497.507158]  <TASK>
[ 4497.507299]  ? free_irq+0x295/0x340
[ 4497.507522]  ? __warn+0x7c/0x130
[ 4497.507740]  ? free_irq+0x295/0x340
[ 4497.507963]  ? report_bug+0x171/0x1a0
[ 4497.508197]  ? handle_bug+0x3c/0x70
[ 4497.508417]  ? exc_invalid_op+0x17/0x70
[ 4497.508662]  ? asm_exc_invalid_op+0x1a/0x20
[ 4497.508926]  ? free_irq+0x295/0x340
[ 4497.509146]  mlx5_irq_pool_free_irqs+0x48/0x90
[ 4497.509421]  mlx5_irq_table_free_irqs+0x38/0x50
[ 4497.509714]  mlx5_core_eq_free_irqs+0x27/0x40
[ 4497.509984]  shutdown+0x7b/0x100
[ 4497.510184]  pci_device_shutdown+0x30/0x60
[ 4497.510440]  device_shutdown+0x14d/0x240
[ 4497.510698]  kernel_power_off+0x30/0x70
[ 4497.510938]  process_one_work+0x1e6/0x3e0
[ 4497.511183]  worker_thread+0x49/0x3b0
[ 4497.511407]  ? __pfx_worker_thread+0x10/0x10
[ 4497.511679]  kthread+0xe0/0x110
[ 4497.511879]  ? __pfx_kthread+0x10/0x10
[ 4497.512114]  ret_from_fork+0x29/0x50
[ 4497.512342]  </TASK>

Fixes: 9c2d080 ("net/mlx5: Free irqs only on shutdown callback")
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@gregkh
Saeed Mahameed authored and gregkh committed Sep 19, 2023
1 parent 017a058 commit 8eea0af
Showing 1 changed file with 20 additions and 6 deletions.
26 changes: 20 additions & 6 deletions drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -123,18 +123,32 @@ int mlx5_set_msix_vec_count(struct mlx5_core_dev *dev, int function_id,
return ret;
}

static void irq_release(struct mlx5_irq *irq)
/* mlx5_system_free_irq - Free an IRQ
* @irq: IRQ to free
*
* Free the IRQ and other resources such as rmap from the system.
* BUT doesn't free or remove reference from mlx5.
* This function is very important for the shutdown flow, where we need to
* cleanup system resoruces but keep mlx5 objects alive,
* see mlx5_irq_table_free_irqs().
*/
static void mlx5_system_free_irq(struct mlx5_irq *irq)
{
struct mlx5_irq_pool *pool = irq->pool;

xa_erase(&pool->irqs, irq->index);
/* free_irq requires that affinity_hint and rmap will be cleared
* before calling it. This is why there is asymmetry with set_rmap
* which should be called after alloc_irq but before request_irq.
*/
irq_update_affinity_hint(irq->irqn, NULL);
free_cpumask_var(irq->mask);
free_irq(irq->irqn, &irq->nh);
}

static void irq_release(struct mlx5_irq *irq)
{
struct mlx5_irq_pool *pool = irq->pool;

xa_erase(&pool->irqs, irq->index);
mlx5_system_free_irq(irq);
free_cpumask_var(irq->mask);
kfree(irq);
}

Expand Down Expand Up @@ -597,7 +611,7 @@ static void mlx5_irq_pool_free_irqs(struct mlx5_irq_pool *pool)
unsigned long index;

xa_for_each(&pool->irqs, index, irq)
free_irq(irq->irqn, &irq->nh);
mlx5_system_free_irq(irq);
}

static void mlx5_irq_pools_free_irqs(struct mlx5_irq_table *table)
Expand Down

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