linux-kernel - [PATCH] scsi: megaraid_sas: use spin

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Message-ID: <20201021064502.35469-1-tian.xianting@h3c.com>
Date:   Wed, 21 Oct 2020 14:45:02 +0800
From:   Xianting Tian <tian.xianting@....com>
To:     <kashyap.desai@...adcom.com>, <sumit.saxena@...adcom.com>,
        <shivasharan.srikanteshwara@...adcom.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>
CC:     <megaraidlinux.pdl@...adcom.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Xianting Tian <tian.xianting@....com>
Subject: [PATCH] scsi: megaraid_sas: use spin_lock() in hard IRQ

Since we already in hard IRQ context when running megasas_isr(), so use
spin_lock() is enough, which is faster than spin_lock_irqsave().

Signed-off-by: Xianting Tian <tian.xianting@....com>
---
 drivers/scsi/megaraid/megaraid_sas_base.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 2b7e7b5f3..bd186254d 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -3977,15 +3977,14 @@ static irqreturn_t megasas_isr(int irq, void *devp)
 {
 	struct megasas_irq_context *irq_context = devp;
 	struct megasas_instance *instance = irq_context->instance;
-	unsigned long flags;
 	irqreturn_t rc;
 
 	if (atomic_read(&instance->fw_reset_no_pci_access))
 		return IRQ_HANDLED;
 
-	spin_lock_irqsave(&instance->hba_lock, flags);
+	spin_lock(&instance->hba_lock);
 	rc = megasas_deplete_reply_queue(instance, DID_OK);
-	spin_unlock_irqrestore(&instance->hba_lock, flags);
+	spin_unlock(&instance->hba_lock);
 
 	return rc;
 }
-- 
2.17.1