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net/mlx5_core: Avoid usage command work entry after writing command doorbell
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>
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1 changed files with 2 additions and 1 deletions
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@ -515,10 +515,11 @@ static void cmd_work_handler(struct work_struct *work)
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ent->ts1 = ktime_get_ns();
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/* ring doorbell after the descriptor is valid */
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mlx5_core_dbg(dev, "writing 0x%x to command doorbell\n", 1 << ent->idx);
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wmb();
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iowrite32be(1 << ent->idx, &dev->iseg->cmd_dbell);
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mlx5_core_dbg(dev, "write 0x%x to command doorbell\n", 1 << ent->idx);
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mmiowb();
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/* if not in polling don't use ent after this point */
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if (cmd->mode == CMD_MODE_POLLING) {
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poll_timeout(ent);
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/* make sure we read the descriptor after ownership is SW */
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