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Message-Id: <20210112140121.1487619-1-sebastien.laveze@oss.nxp.com>
Date: Tue, 12 Jan 2021 15:01:22 +0100
From: Sebastien Laveze <sebastien.laveze@....nxp.com>
To: Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...com>,
Jose Abreu <joabreu@...opsys.com>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: linux-rt-users@...r.kernel.org
Subject: [PATCH net] net: stmmac: use __napi_schedule() for PREEMPT_RT
From: Seb Laveze <sebastien.laveze@....com>
Use of __napi_schedule_irqoff() is not safe with PREEMPT_RT in which
hard interrupts are not disabled while running the threaded interrupt.
Using __napi_schedule() works for both PREEMPT_RT and mainline Linux,
just at the cost of an additional check if interrupts are disabled for
mainline (since they are already disabled).
Similar to the fix done for enetc:
215602a8d212 ("enetc: use napi_schedule to be compatible with PREEMPT_RT")
Signed-off-by: Seb Laveze <sebastien.laveze@....com>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 5b1c12ff98c0..2d90d6856ec5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2184,7 +2184,7 @@ static int stmmac_napi_check(struct stmmac_priv *priv, u32 chan)
spin_lock_irqsave(&ch->lock, flags);
stmmac_disable_dma_irq(priv, priv->ioaddr, chan, 1, 0);
spin_unlock_irqrestore(&ch->lock, flags);
- __napi_schedule_irqoff(&ch->rx_napi);
+ __napi_schedule(&ch->rx_napi);
}
}
@@ -2193,7 +2193,7 @@ static int stmmac_napi_check(struct stmmac_priv *priv, u32 chan)
spin_lock_irqsave(&ch->lock, flags);
stmmac_disable_dma_irq(priv, priv->ioaddr, chan, 0, 1);
spin_unlock_irqrestore(&ch->lock, flags);
- __napi_schedule_irqoff(&ch->tx_napi);
+ __napi_schedule(&ch->tx_napi);
}
}
--
2.25.1
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