linux-kernel - [PATCH net-next 3/4] net: ipa: get rid of some unneeded IPA interrupt code

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Date:   Tue, 27 Jul 2021 14:46:28 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     bjorn.andersson@...aro.org, evgreen@...omium.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 3/4] net: ipa: get rid of some unneeded IPA interrupt code

The pending IPA interrupts are checked by ipa_isr_thread(), and
interrupts are processed only if an enabled interrupt has a
condition pending.  But ipa_interrupt_process_all() now makes the
same check, so the one in ipa_isr_thread() can just be skipped.

Also in ipa_isr_thread(), any interrupt conditions pending which are
not enabled are cleared.  Here too, ipa_interrupt_process_all() now
clears such excess interrupt conditions, so ipa_isr_thread() doesn't
have to.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_interrupt.c | 17 +----------------
 1 file changed, 1 insertion(+), 16 deletions(-)

diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c
index c12d0c33557cd..d149e496ffa72 100644
--- a/drivers/net/ipa/ipa_interrupt.c
+++ b/drivers/net/ipa/ipa_interrupt.c
@@ -116,26 +116,11 @@ static irqreturn_t ipa_isr_thread(int irq, void *dev_id)
 {
 	struct ipa_interrupt *interrupt = dev_id;
 	struct ipa *ipa = interrupt->ipa;
-	u32 offset;
-	u32 mask;
 
 	ipa_clock_get(ipa);
 
-	offset = ipa_reg_irq_stts_offset(ipa->version);
-	mask = ioread32(ipa->reg_virt + offset);
-	if (mask & interrupt->enabled) {
-		ipa_interrupt_process_all(interrupt);
-		goto out_clock_put;
-	}
+	ipa_interrupt_process_all(interrupt);
 
-	/* Nothing in the mask was supposed to cause an interrupt */
-	offset = ipa_reg_irq_clr_offset(ipa->version);
-	iowrite32(mask, ipa->reg_virt + offset);
-
-	dev_err(&ipa->pdev->dev, "%s: unexpected interrupt, mask 0x%08x\n",
-		__func__, mask);
-
-out_clock_put:
 	ipa_clock_put(ipa);
 
 	return IRQ_HANDLED;
-- 
2.27.0