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

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Message-ID: <20220517115429.GA1901088@nvidia.com>
Date:   Tue, 17 May 2022 08:54:29 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     cgel.zte@...il.com
Cc:     mkalderon@...vell.com, aelior@...vell.com, leon@...nel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] qedr: Remove unnecessary synchronize_irq() before
 free_irq()

On Fri, May 13, 2022 at 08:16:47AM +0000, cgel.zte@...il.com wrote:
> 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>
> Acked-by: Michal Kalderon <michal.kalderon@...vell.com>
> ---
>  drivers/infiniband/hw/qedr/main.c | 1 -
>  1 file changed, 1 deletion(-)

Applied to for-next, thanks

Jason