linux-kernel - [PATCH net-next 6/6] net: ipa: don't bother zeroing an already zero register

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Date: Fri, 23 Feb 2024 07:39:30 -0600
From: Alex Elder <elder@...aro.org>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: mka@...omium.org,
	andersson@...nel.org,
	quic_cpratapa@...cinc.com,
	quic_avuyyuru@...cinc.com,
	quic_jponduru@...cinc.com,
	quic_subashab@...cinc.com,
	elder@...nel.org,
	netdev@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next 6/6] net: ipa: don't bother zeroing an already zero register

In ipa_interrupt_suspend_clear_all(), if the SUSPEND_INFO register
read contains no set bits, there's no interrupt condition to clear.
Skip the write to the clear register in that case.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_interrupt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c
index 501962cc4e90f..4d80bf77a5323 100644
--- a/drivers/net/ipa/ipa_interrupt.c
+++ b/drivers/net/ipa/ipa_interrupt.c
@@ -59,7 +59,7 @@ static void ipa_interrupt_suspend_clear_all(struct ipa_interrupt *interrupt)
 		val = ioread32(ipa->reg_virt + reg_n_offset(reg, unit));
 
 		/* SUSPEND interrupt status isn't cleared on IPA version 3.0 */
-		if (ipa->version == IPA_VERSION_3_0)
+		if (!val || ipa->version == IPA_VERSION_3_0)
 			continue;
 
 		reg = ipa_reg(ipa, IRQ_SUSPEND_CLR);
-- 
2.40.1