linux-kernel - Re: [PATCH -next] habanalabs/gaudi2: fix free irq in error path in gaudi2_enable

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Message-ID: <CAFCwf13WoDk6y435zmG5VQa1kRqDo1TA26ZhT5=bTp6qtQr8XQ@mail.gmail.com>
Date:   Mon, 29 Aug 2022 13:14:04 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] habanalabs/gaudi2: fix free irq in error path in gaudi2_enable_msix()

On Thu, Aug 25, 2022 at 4:23 PM Yang Yingliang <yangyingliang@...wei.com> wrote:
>
> Add two variables to store completion irq and event queue irq. And add
> a new lable to free event queue irq in error path in gaudi2_enable_msix().
>
> Fixes: d7bb1ac89b2f ("habanalabs: add gaudi2 asic-specific code")
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  drivers/misc/habanalabs/gaudi2/gaudi2.c | 21 +++++++++++++--------
>  1 file changed, 13 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/misc/habanalabs/gaudi2/gaudi2.c b/drivers/misc/habanalabs/gaudi2/gaudi2.c
> index 98336a1a84b0..54eca19b270b 100644
> --- a/drivers/misc/habanalabs/gaudi2/gaudi2.c
> +++ b/drivers/misc/habanalabs/gaudi2/gaudi2.c
> @@ -3518,6 +3518,7 @@ static int gaudi2_enable_msix(struct hl_device *hdev)
>         struct asic_fixed_properties *prop = &hdev->asic_prop;
>         struct gaudi2_device *gaudi2 = hdev->asic_specific;
>         int rc, irq, i, j, user_irq_init_cnt;
> +       int completion_irq, event_queue_irq;
>         irq_handler_t irq_handler;
>         struct hl_cq *cq;
>
> @@ -3532,17 +3533,19 @@ static int gaudi2_enable_msix(struct hl_device *hdev)
>                 return rc;
>         }
>
> -       irq = pci_irq_vector(hdev->pdev, GAUDI2_IRQ_NUM_COMPLETION);
> +       completion_irq = pci_irq_vector(hdev->pdev, GAUDI2_IRQ_NUM_COMPLETION);
>         cq = &hdev->completion_queue[GAUDI2_RESERVED_CQ_CS_COMPLETION];
> -       rc = request_irq(irq, hl_irq_handler_cq, 0, gaudi2_irq_name(GAUDI2_IRQ_NUM_COMPLETION), cq);
> +       rc = request_irq(completion_irq, hl_irq_handler_cq, 0,
> +                        gaudi2_irq_name(GAUDI2_IRQ_NUM_COMPLETION), cq);
>         if (rc) {
>                 dev_err(hdev->dev, "Failed to request IRQ %d", irq);
Please fix the error prints to print the correct irq.
And I think you should remove the "irq" local variable completely.

Oded

>                 goto free_irq_vectors;
>         }
>
> -       irq = pci_irq_vector(hdev->pdev, GAUDI2_IRQ_NUM_EVENT_QUEUE);
> -       rc = request_irq(irq, hl_irq_handler_eq, 0, gaudi2_irq_name(GAUDI2_IRQ_NUM_EVENT_QUEUE),
> -                       &hdev->event_queue);
> +       event_queue_irq = pci_irq_vector(hdev->pdev, GAUDI2_IRQ_NUM_EVENT_QUEUE);
> +       rc = request_irq(event_queue_irq, hl_irq_handler_eq, 0,
> +                        gaudi2_irq_name(GAUDI2_IRQ_NUM_EVENT_QUEUE),
> +                        &hdev->event_queue);
>         if (rc) {
>                 dev_err(hdev->dev, "Failed to request IRQ %d", irq);
>                 goto free_completion_irq;
> @@ -3551,7 +3554,7 @@ static int gaudi2_enable_msix(struct hl_device *hdev)
>         rc = gaudi2_dec_enable_msix(hdev);
>         if (rc) {
>                 dev_err(hdev->dev, "Failed to enable decoder IRQ");
> -               goto free_completion_irq;
> +               goto free_event_queue_irq;
>         }
>
>         for (i = GAUDI2_IRQ_NUM_USER_FIRST, j = prop->user_dec_intr_count, user_irq_init_cnt = 0;
> @@ -3582,9 +3585,11 @@ static int gaudi2_enable_msix(struct hl_device *hdev)
>
>         gaudi2_dec_disable_msix(hdev, GAUDI2_IRQ_NUM_SHARED_DEC1_ABNRM + 1);
>
> +free_event_queue_irq:
> +       free_irq(event_queue_irq, &hdev->event_queue);
> +
>  free_completion_irq:
> -       irq = pci_irq_vector(hdev->pdev, GAUDI2_IRQ_NUM_COMPLETION);
> -       free_irq(irq, cq);
> +       free_irq(completion_irq, cq);
>
>  free_irq_vectors:
>         pci_free_irq_vectors(hdev->pdev);
> --
> 2.25.1
>