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

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Date:   Mon, 16 May 2022 07:26:46 +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] qed: 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/qed/qed_main.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_main.c b/drivers/net/ethernet/qlogic/qed/qed_main.c
index c5003fa1a25e..c91898be7c03 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_main.c
@@ -823,7 +823,6 @@ static void qed_slowpath_irq_free(struct qed_dev *cdev)
 		for_each_hwfn(cdev, i) {
 			if (!cdev->hwfns[i].b_int_requested)
 				break;
-			synchronize_irq(cdev->int_params.msix_table[i].vector);
 			free_irq(cdev->int_params.msix_table[i].vector,
 				 &cdev->hwfns[i].sp_dpc);
 		}
--
2.25.1