From: Barry Song <song.bao.hua@hisilicon.com>
To: <vkoul@kernel.org>, <dmaengine@vger.kernel.org>
Cc: <linuxarm@huawei.com>, Barry Song <song.bao.hua@hisilicon.com>,
"Peter Ujfalusi" <peter.ujfalusi@ti.com>
Subject: [PATCH v2 02/10] dmaengine: ti: k3-udma: remove redundant irqsave and irqrestore in hardIRQ
Date: Wed, 28 Oct 2020 10:52:44 +1300 [thread overview]
Message-ID: <20201027215252.25820-3-song.bao.hua@hisilicon.com> (raw)
In-Reply-To: <20201027215252.25820-1-song.bao.hua@hisilicon.com>
Running in hardIRQ, disabling IRQ is redundant since hardIRQ has disabled
IRQ. This patch removes the irqsave and irqstore to save some instruction
cycles.
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
---
drivers/dma/ti/k3-udma.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 82cf6c77f5c9..e508280b3d70 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -1020,13 +1020,12 @@ static irqreturn_t udma_ring_irq_handler(int irq, void *data)
{
struct udma_chan *uc = data;
struct udma_desc *d;
- unsigned long flags;
dma_addr_t paddr = 0;
if (udma_pop_from_ring(uc, &paddr) || !paddr)
return IRQ_HANDLED;
- spin_lock_irqsave(&uc->vc.lock, flags);
+ spin_lock(&uc->vc.lock);
/* Teardown completion message */
if (cppi5_desc_is_tdcm(paddr)) {
@@ -1077,7 +1076,7 @@ static irqreturn_t udma_ring_irq_handler(int irq, void *data)
}
}
out:
- spin_unlock_irqrestore(&uc->vc.lock, flags);
+ spin_unlock(&uc->vc.lock);
return IRQ_HANDLED;
}
@@ -1086,9 +1085,8 @@ static irqreturn_t udma_udma_irq_handler(int irq, void *data)
{
struct udma_chan *uc = data;
struct udma_desc *d;
- unsigned long flags;
- spin_lock_irqsave(&uc->vc.lock, flags);
+ spin_lock(&uc->vc.lock);
d = uc->desc;
if (d) {
d->tr_idx = (d->tr_idx + 1) % d->sglen;
@@ -1103,7 +1101,7 @@ static irqreturn_t udma_udma_irq_handler(int irq, void *data)
}
}
- spin_unlock_irqrestore(&uc->vc.lock, flags);
+ spin_unlock(&uc->vc.lock);
return IRQ_HANDLED;
}
--
2.25.1
next prev parent reply other threads:[~2020-10-27 21:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-27 21:52 [PATCH v2 00/10] dmaengine: a bundle of cleanup on spin_lock_irqsave/irqrestore Barry Song
2020-10-27 21:52 ` [PATCH v2 01/10] dmaengine: ipu_idmac: remove redundant irqsave and restore in hardIRQ Barry Song
2020-10-27 21:52 ` Barry Song [this message]
2020-10-27 21:52 ` [PATCH v2 03/10] dmaengine: sf-pdma: remove redundant irqsave and irqrestore " Barry Song
2020-10-27 21:52 ` [PATCH v2 04/10] dmaengine: tegra210-adma: " Barry Song
2020-10-27 21:52 ` [PATCH v2 05/10] dmaengine: milbeaut-xdmac: " Barry Song
2020-10-27 21:52 ` [PATCH v2 06/10] dmaengine: k3dma: " Barry Song
2020-10-27 21:52 ` [PATCH v2 07/10] dmaengine: hisi_dma: " Barry Song
2020-10-27 21:52 ` [PATCH v2 08/10] dmaengine: moxart-dma: " Barry Song
2020-10-27 21:52 ` [PATCH v2 09/10] dmaengine: ste_dma40: " Barry Song
2020-11-05 13:48 ` Linus Walleij
2020-10-27 21:52 ` [PATCH v2 10/10] dmaengine: pxa_dma: " Barry Song
2020-11-09 11:56 ` [PATCH v2 00/10] dmaengine: a bundle of cleanup on spin_lock_irqsave/irqrestore Vinod Koul
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