This is a note to let you know that I've just added the patch titled
net/mlx5: Fix missing lock on sync reset reload
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-mlx5-fix-missing-lock-on-sync-reset-reload.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ce87eab7bd0e07dee18ff45626a01b934c3c1362
Author: Moshe Shemesh <moshe@xxxxxxxxxx>
Date: Tue Jul 30 09:16:34 2024 +0300
net/mlx5: Fix missing lock on sync reset reload
[ Upstream commit 572f9caa9e7295f8c8822e4122c7ae8f1c412ff9 ]
On sync reset reload work, when remote host updates devlink on reload
actions performed on that host, it misses taking devlink lock before
calling devlink_remote_reload_actions_performed() which results in
triggering lock assert like the following:
WARNING: CPU: 4 PID: 1164 at net/devlink/core.c:261 devl_assert_locked+0x3e/0x50
…
CPU: 4 PID: 1164 Comm: kworker/u96:6 Tainted: G S W 6.10.0-rc2+ #116
Hardware name: Supermicro SYS-2028TP-DECTR/X10DRT-PT, BIOS 2.0 12/18/2015
Workqueue: mlx5_fw_reset_events mlx5_sync_reset_reload_work [mlx5_core]
RIP: 0010:devl_assert_locked+0x3e/0x50
…
Call Trace:
<TASK>
? __warn+0xa4/0x210
? devl_assert_locked+0x3e/0x50
? report_bug+0x160/0x280
? handle_bug+0x3f/0x80
? exc_invalid_op+0x17/0x40
? asm_exc_invalid_op+0x1a/0x20
? devl_assert_locked+0x3e/0x50
devlink_notify+0x88/0x2b0
? mlx5_attach_device+0x20c/0x230 [mlx5_core]
? __pfx_devlink_notify+0x10/0x10
? process_one_work+0x4b6/0xbb0
process_one_work+0x4b6/0xbb0
[…]
Fixes: 84a433a40d0e ("net/mlx5: Lock mlx5 devlink reload callbacks")
Signed-off-by: Moshe Shemesh <moshe@xxxxxxxxxx>
Reviewed-by: Maor Gottlieb <maorg@xxxxxxxxxx>
Signed-off-by: Tariq Toukan <tariqt@xxxxxxxxxx>
Reviewed-by: Wojciech Drewek <wojciech.drewek@xxxxxxxxx>
Link: https://patch.msgid.link/20240730061638.1831002-6-tariqt@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
index 3a9cdf79403ae..6b17346aa4cef 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
@@ -206,6 +206,7 @@ int mlx5_fw_reset_set_live_patch(struct mlx5_core_dev *dev)
static void mlx5_fw_reset_complete_reload(struct mlx5_core_dev *dev, bool unloaded)
{
struct mlx5_fw_reset *fw_reset = dev->priv.fw_reset;
+ struct devlink *devlink = priv_to_devlink(dev);
/* if this is the driver that initiated the fw reset, devlink completed the reload */
if (test_bit(MLX5_FW_RESET_FLAGS_PENDING_COMP, &fw_reset->reset_flags)) {
@@ -217,9 +218,11 @@ static void mlx5_fw_reset_complete_reload(struct mlx5_core_dev *dev, bool unload
mlx5_core_err(dev, "reset reload flow aborted, PCI reads still not working\n");
else
mlx5_load_one(dev, true);
- devlink_remote_reload_actions_performed(priv_to_devlink(dev), 0,
+ devl_lock(devlink);
+ devlink_remote_reload_actions_performed(devlink, 0,
BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE));
+ devl_unlock(devlink);
}
}
