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net/mlx5_core: Avoid usage command work entry after writing command doorbell

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Avoid usage of command work entry in cmd_work_handler since it can be released
by mlx5_cmd_invoke before the work handler returns to running.

Signed-off-by: Ira Gusinsky <irenag@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ira Gusinsky 2015-04-02 17:07:27 +03:00 committed by David S. Miller
parent 05e4ecd1dc
commit 21db507439
1 changed files with 2 additions and 1 deletions
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drivers/net/ethernet/mellanox/mlx5/core/cmd.c
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@ -515,10 +515,11 @@ static void cmd_work_handler(struct work_struct *work)
ent->ts1 = ktime_get_ns();
/* ring doorbell after the descriptor is valid */
mlx5_core_dbg(dev, "writing 0x%x to command doorbell\n", 1 << ent->idx);
wmb();
iowrite32be(1 << ent->idx, &dev->iseg->cmd_dbell);
mlx5_core_dbg(dev, "write 0x%x to command doorbell\n", 1 << ent->idx);
mmiowb();
/* if not in polling don't use ent after this point */
if (cmd->mode == CMD_MODE_POLLING) {
poll_timeout(ent);
/* make sure we read the descriptor after ownership is SW */