netdev - [PATCH net-next 19/33] can: kvaser_pciefd: Remove useless write to interrupt register

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230622082658.571150-20-mkl@pengutronix.de>
Date: Thu, 22 Jun 2023 10:26:44 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	linux-can@...r.kernel.org,
	kernel@...gutronix.de,
	Jimmy Assarsson <extja@...ser.com>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 19/33] can: kvaser_pciefd: Remove useless write to interrupt register

From: Jimmy Assarsson <extja@...ser.com>

The PCI interrupt register, KVASER_PCIEFD_IRQ_REG, is level triggered.
Writing to the register doesn't affect it.

Fixes: 26ad340e582d ("can: kvaser_pciefd: Add driver for Kvaser PCIEcan devices")
Signed-off-by: Jimmy Assarsson <extja@...ser.com>
Reviewed-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
Link: https://lore.kernel.org/all/20230529134248.752036-2-extja@kvaser.com
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/kvaser_pciefd.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index be189edb256c..d60d17199a1b 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -1768,7 +1768,6 @@ static irqreturn_t kvaser_pciefd_irq_handler(int irq, void *dev)
 			kvaser_pciefd_transmit_irq(pcie->can[i]);
 	}
 
-	iowrite32(board_irq, pcie->reg_base + KVASER_PCIEFD_IRQ_REG);
 	return IRQ_HANDLED;
 }
 
@@ -1842,9 +1841,7 @@ static int kvaser_pciefd_probe(struct pci_dev *pdev,
 		  KVASER_PCIEFD_SRB_IRQ_DUF0 | KVASER_PCIEFD_SRB_IRQ_DUF1,
 		  pcie->reg_base + KVASER_PCIEFD_SRB_IEN_REG);
 
-	/* Reset IRQ handling, expected to be off before */
-	iowrite32(KVASER_PCIEFD_IRQ_ALL_MSK,
-		  pcie->reg_base + KVASER_PCIEFD_IRQ_REG);
+	/* Enable PCI interrupts */
 	iowrite32(KVASER_PCIEFD_IRQ_ALL_MSK,
 		  pcie->reg_base + KVASER_PCIEFD_IEN_REG);
 
@@ -1906,10 +1903,8 @@ static void kvaser_pciefd_remove(struct pci_dev *pdev)
 
 	kvaser_pciefd_remove_all_ctrls(pcie);
 
-	/* Turn off IRQ generation */
+	/* Disable interrupts */
 	iowrite32(0, pcie->reg_base + KVASER_PCIEFD_SRB_CTRL_REG);
-	iowrite32(KVASER_PCIEFD_IRQ_ALL_MSK,
-		  pcie->reg_base + KVASER_PCIEFD_IRQ_REG);
 	iowrite32(0, pcie->reg_base + KVASER_PCIEFD_IEN_REG);
 
 	free_irq(pcie->pci->irq, pcie);
-- 
2.40.1