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net/mlx5: Fix read from coherent memory

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Use accessor function READ_ONCE to read from coherent memory modified
by the device and read by the driver. This becomes most important in
preemptive kernels where cond_resched implementation does not have the
side effect which guaranteed the updated value.

Fixes: 269d26f47f ("net/mlx5: Reduce command polling interval")
Change-Id: Ie6deeb565ffaf76777b07448c7fbcce3510bbb8a
Signed-off-by: Eli Cohen <eli@mellanox.com>
Reported-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Eli Cohen 2018-09-02 12:01:53 +03:00 committed by Saeed Mahameed
parent c73480910e
commit 250ae0d46d
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/mellanox/mlx5/core/cmd.c
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@ -206,7 +206,7 @@ static void poll_timeout(struct mlx5_cmd_work_ent *ent)
u8 own;
do {
own = ent->lay->status_own;
own = READ_ONCE(ent->lay->status_own);
if (!(own & CMD_OWNER_HW)) {
ent->ret = 0;
return;