linux-kernel - [PATCH] net: ethernet: et131x: Remove redundant register read

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Message-Id: <20200717132135.361267-1-mark.einon@gmail.com>
Date:   Fri, 17 Jul 2020 14:21:35 +0100
From:   Mark Einon <mark.einon@...il.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Einon <mark.einon@...il.com>
Subject: [PATCH] net: ethernet: et131x: Remove redundant register read

Following the removal of an unused variable assignment (remove
unused variable 'pm_csr') the associated register read can also go,
as the read also occurs in the subsequent et1310_in_phy_coma()
call.

Signed-off-by: Mark Einon <mark.einon@...il.com>
---
 drivers/net/ethernet/agere/et131x.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/ethernet/agere/et131x.c b/drivers/net/ethernet/agere/et131x.c
index 8806e1e4c20f..41f8821f792d 100644
--- a/drivers/net/ethernet/agere/et131x.c
+++ b/drivers/net/ethernet/agere/et131x.c
@@ -983,7 +983,6 @@ static void et1310_setup_device_for_multicast(struct et131x_adapter *adapter)
 	}
 
 	/* Write out the new hash to the device */
-	readl(&adapter->regs->global.pm_csr);
 	if (!et1310_in_phy_coma(adapter)) {
 		writel(hash1, &rxmac->multi_hash1);
 		writel(hash2, &rxmac->multi_hash2);
@@ -1023,7 +1022,6 @@ static void et1310_setup_device_for_unicast(struct et131x_adapter *adapter)
 		  (adapter->addr[4] << ET_RX_UNI_PF_ADDR1_5_SHIFT) |
 		   adapter->addr[5];
 
-	readl(&adapter->regs->global.pm_csr);
 	if (!et1310_in_phy_coma(adapter)) {
 		writel(uni_pf1, &rxmac->uni_pf_addr1);
 		writel(uni_pf2, &rxmac->uni_pf_addr2);
@@ -3444,7 +3442,6 @@ static irqreturn_t et131x_isr(int irq, void *dev_id)
 			/* Tell the device to send a pause packet via the back
 			 * pressure register (bp req and bp xon/xoff)
 			 */
-			readl(&iomem->global.pm_csr);
 			if (!et1310_in_phy_coma(adapter))
 				writel(3, &iomem->txmac.bp_ctrl);
 		}
-- 
2.26.2