linux-kernel - [PATCH for-next 02/32] scsi: ipr: Replace spin_lock_irqsave with spin

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Date:   Sun, 7 Feb 2021 19:36:33 +0800
From:   Xiaofei Tan <tanxiaofei@...wei.com>
To:     <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...neuler.org>, Xiaofei Tan <tanxiaofei@...wei.com>
Subject: [PATCH for-next 02/32] scsi: ipr: Replace spin_lock_irqsave with spin_lock in hard IRQ

It is redundant to do irqsave and irqrestore in hardIRQ context, where
it has been in a irq-disabled context.

Signed-off-by: Xiaofei Tan <tanxiaofei@...wei.com>
---
 drivers/scsi/ipr.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index e451102..0309e8f 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -5815,7 +5815,6 @@ static irqreturn_t ipr_isr(int irq, void *devp)
 {
 	struct ipr_hrr_queue *hrrq = (struct ipr_hrr_queue *)devp;
 	struct ipr_ioa_cfg *ioa_cfg = hrrq->ioa_cfg;
-	unsigned long hrrq_flags = 0;
 	u32 int_reg = 0;
 	int num_hrrq = 0;
 	int irq_none = 0;
@@ -5823,10 +5822,10 @@ static irqreturn_t ipr_isr(int irq, void *devp)
 	irqreturn_t rc = IRQ_NONE;
 	LIST_HEAD(doneq);
 
-	spin_lock_irqsave(hrrq->lock, hrrq_flags);
+	spin_lock(hrrq->lock);
 	/* If interrupts are disabled, ignore the interrupt */
 	if (!hrrq->allow_interrupts) {
-		spin_unlock_irqrestore(hrrq->lock, hrrq_flags);
+		spin_unlock(hrrq->lock);
 		return IRQ_NONE;
 	}
 
@@ -5862,7 +5861,7 @@ static irqreturn_t ipr_isr(int irq, void *devp)
 	if (unlikely(rc == IRQ_NONE))
 		rc = ipr_handle_other_interrupt(ioa_cfg, int_reg);
 
-	spin_unlock_irqrestore(hrrq->lock, hrrq_flags);
+	spin_unlock(hrrq->lock);
 	list_for_each_entry_safe(ipr_cmd, temp, &doneq, queue) {
 		list_del(&ipr_cmd->queue);
 		del_timer(&ipr_cmd->timer);
@@ -5883,16 +5882,15 @@ static irqreturn_t ipr_isr_mhrrq(int irq, void *devp)
 {
 	struct ipr_hrr_queue *hrrq = (struct ipr_hrr_queue *)devp;
 	struct ipr_ioa_cfg *ioa_cfg = hrrq->ioa_cfg;
-	unsigned long hrrq_flags = 0;
 	struct ipr_cmnd *ipr_cmd, *temp;
 	irqreturn_t rc = IRQ_NONE;
 	LIST_HEAD(doneq);
 
-	spin_lock_irqsave(hrrq->lock, hrrq_flags);
+	spin_lock(hrrq->lock);
 
 	/* If interrupts are disabled, ignore the interrupt */
 	if (!hrrq->allow_interrupts) {
-		spin_unlock_irqrestore(hrrq->lock, hrrq_flags);
+		spin_unlock(hrrq->lock);
 		return IRQ_NONE;
 	}
 
@@ -5900,7 +5898,7 @@ static irqreturn_t ipr_isr_mhrrq(int irq, void *devp)
 		if ((be32_to_cpu(*hrrq->hrrq_curr) & IPR_HRRQ_TOGGLE_BIT) ==
 		       hrrq->toggle_bit) {
 			irq_poll_sched(&hrrq->iopoll);
-			spin_unlock_irqrestore(hrrq->lock, hrrq_flags);
+			spin_unlock(hrrq->lock);
 			return IRQ_HANDLED;
 		}
 	} else {
@@ -5911,7 +5909,7 @@ static irqreturn_t ipr_isr_mhrrq(int irq, void *devp)
 				rc =  IRQ_HANDLED;
 	}
 
-	spin_unlock_irqrestore(hrrq->lock, hrrq_flags);
+	spin_unlock(hrrq->lock);
 
 	list_for_each_entry_safe(ipr_cmd, temp, &doneq, queue) {
 		list_del(&ipr_cmd->queue);
@@ -10087,16 +10085,15 @@ static int ipr_request_other_msi_irqs(struct ipr_ioa_cfg *ioa_cfg,
 static irqreturn_t ipr_test_intr(int irq, void *devp)
 {
 	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)devp;
-	unsigned long lock_flags = 0;
 	irqreturn_t rc = IRQ_HANDLED;
 
 	dev_info(&ioa_cfg->pdev->dev, "Received IRQ : %d\n", irq);
-	spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+	spin_lock(ioa_cfg->host->host_lock);
 
 	ioa_cfg->msi_received = 1;
 	wake_up(&ioa_cfg->msi_wait_q);
 
-	spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
+	spin_unlock(ioa_cfg->host->host_lock);
 	return rc;
 }
 
-- 
2.8.1