linux-kernel - Re: [PATCH v3] thunderbolt: Add the missed ida_simple_remove() in ring_request

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Message-ID: <20201015105508.GT4077@smile.fi.intel.com>
Date:   Thu, 15 Oct 2020 13:55:08 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Jing Xiangfeng <jingxiangfeng@...wei.com>
Cc:     andreas.noever@...il.com, michael.jamet@...el.com,
        mika.westerberg@...ux.intel.com, YehezkelShB@...il.com,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] thunderbolt: Add the missed ida_simple_remove() in
 ring_request_msix()

On Thu, Oct 15, 2020 at 04:40:53PM +0800, Jing Xiangfeng wrote:
> ring_request_msix() misses to call ida_simple_remove() in an error path.
> Add a label 'err_ida_remove' and jump to it.

FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Fixes: 046bee1f9ab8 ("thunderbolt: Add MSI-X support")
> Signed-off-by: Jing Xiangfeng <jingxiangfeng@...wei.com>
> ---

When new version is issued do not forget to add changelog here (after cutter '---' line).

>  drivers/thunderbolt/nhi.c | 19 +++++++++++++++----
>  1 file changed, 15 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
> index 5f7489fa1327..a331e52789e3 100644
> --- a/drivers/thunderbolt/nhi.c
> +++ b/drivers/thunderbolt/nhi.c
> @@ -405,12 +405,23 @@ static int ring_request_msix(struct tb_ring *ring, bool no_suspend)
>  
>  	ring->vector = ret;
>  
> -	ring->irq = pci_irq_vector(ring->nhi->pdev, ring->vector);
> -	if (ring->irq < 0)
> -		return ring->irq;
> +	ret = pci_irq_vector(ring->nhi->pdev, ring->vector);
> +	if (ret < 0)
> +		goto err_ida_remove;
> +
> +	ring->irq = ret;
>  
>  	irqflags = no_suspend ? IRQF_NO_SUSPEND : 0;
> -	return request_irq(ring->irq, ring_msix, irqflags, "thunderbolt", ring);
> +	ret = request_irq(ring->irq, ring_msix, irqflags, "thunderbolt", ring);
> +	if (ret)
> +		goto err_ida_remove;
> +
> +	return 0;
> +
> +err_ida_remove:
> +	ida_simple_remove(&nhi->msix_ida, ring->vector);
> +
> +	return ret;
>  }
>  
>  static void ring_release_msix(struct tb_ring *ring)
> -- 
> 2.17.1
> 

-- 
With Best Regards,
Andy Shevchenko