linux-kernel - [PATCH] net: qede: Remove unnecessary synchronize_irq() before free

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Date:   Mon, 16 May 2022 08:22:51 +0000
From:   cgel.zte@...il.com
To:     aelior@...vell.com
Cc:     manishc@...vell.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] net: qede: Remove unnecessary synchronize_irq() before free_irq()

From: Minghao Chi <chi.minghao@....com.cn>

Calling synchronize_irq() right before free_irq() is quite useless. On one
hand the IRQ can easily fire again before free_irq() is entered, on the
other hand free_irq() itself calls synchronize_irq() internally (in a race
condition free way), before any state associated with the IRQ is freed.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi <chi.minghao@....com.cn>
---
 drivers/net/ethernet/qlogic/qede/qede_main.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c
index b4e5a15e308b..f56b679adb4b 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -1916,7 +1916,6 @@ static void qede_sync_free_irqs(struct qede_dev *edev)
 
 	for (i = 0; i < edev->int_info.used_cnt; i++) {
 		if (edev->int_info.msix_cnt) {
-			synchronize_irq(edev->int_info.msix[i].vector);
 			free_irq(edev->int_info.msix[i].vector,
 				 &edev->fp_array[i]);
 		} else {
-- 
2.25.1