[PATCH net-next 04/15] net: mlx5: Replace in_irq() usage.

[Sebastian Andrzej Siewior]

mlx5_eq_async_int() uses in_irq() to decide whether eq::lock needs to be
acquired and released with spin_[un]lock() or the irq saving/restoring
variants.

The usage of in_*() in drivers is phased out and Linus clearly requested
that code which changes behaviour depending on context should either be
seperated or the context be conveyed in an argument passed by the caller,
which usually knows the context.

mlx5_eq_async_int() knows the context via the action argument already so
using it for the lock variant decision is a straight forward replacement
for in_irq().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
Cc: Saeed Mahameed <saeedm at nvidia.com>
Cc: Leon Romanovsky <leon at kernel.org>
Cc: "David S. Miller" <davem at davemloft.net>
Cc: Jakub Kicinski <kuba at kernel.org>
Cc: linux-rdma at vger.kernel.org
---
 drivers/net/ethernet/mellanox/mlx5/core/eq.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 8ebfe782f95e5..3800e9415158b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -189,19 +189,21 @@ u32 mlx5_eq_poll_irq_disabled(struct mlx5_eq_comp *eq)
 	return count_eqe;
 }
 
-static void mlx5_eq_async_int_lock(struct mlx5_eq_async *eq, unsigned long *flags)
+static void mlx5_eq_async_int_lock(struct mlx5_eq_async *eq, bool recovery,
+				   unsigned long *flags)
 	__acquires(&eq->lock)
 {
-	if (in_irq())
+	if (!recovery)
 		spin_lock(&eq->lock);
 	else
 		spin_lock_irqsave(&eq->lock, *flags);
 }
 
-static void mlx5_eq_async_int_unlock(struct mlx5_eq_async *eq, unsigned long *flags)
+static void mlx5_eq_async_int_unlock(struct mlx5_eq_async *eq, bool recovery,
+				     unsigned long *flags)
 	__releases(&eq->lock)
 {
-	if (in_irq())
+	if (!recovery)
 		spin_unlock(&eq->lock);
 	else
 		spin_unlock_irqrestore(&eq->lock, *flags);
@@ -222,12 +224,14 @@ static int mlx5_eq_async_int(struct notifier_block *nb,
 	struct mlx5_core_dev *dev;
 	struct mlx5_eqe *eqe;
 	unsigned long flags;
+	bool recovery;
 	int num_eqes = 0;
 
 	dev = eq->dev;
 	eqt = dev->priv.eq_table;
 
-	mlx5_eq_async_int_lock(eq_async, &flags);
+	recovery = action == ASYNC_EQ_RECOVER;
+	mlx5_eq_async_int_lock(eq_async, recovery, &flags);
 
 	eqe = next_eqe_sw(eq);
 	if (!eqe)
@@ -249,9 +253,9 @@ static int mlx5_eq_async_int(struct notifier_block *nb,
 
 out:
 	eq_update_ci(eq, 1);
-	mlx5_eq_async_int_unlock(eq_async, &flags);
+	mlx5_eq_async_int_unlock(eq_async, recovery, &flags);
 
-	return unlikely(action == ASYNC_EQ_RECOVER) ? num_eqes : 0;
+	return unlikely(recovery) ? num_eqes : 0;
 }
 
 void mlx5_cmd_eq_recover(struct mlx5_core_dev *dev)
-- 
2.28.0