linux-kernel - Re: [PATCH] staging: media: ipu3: Replace depracated MSI API.

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Message-ID: <20200813214028.GB24582@paasikivi.fi.intel.com>
Date:   Fri, 14 Aug 2020 00:40:29 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Suraj Upadhyay <usuraj35@...il.com>
Cc:     bingbu.cao@...el.com, tian.shu.qiu@...el.com, mchehab@...nel.org,
        gregkh@...uxfoundation.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] staging: media: ipu3: Replace depracated MSI API.

Hi Suraj,

Thanks for the patch.

On Sat, Jul 18, 2020 at 07:02:38PM +0530, Suraj Upadhyay wrote:
> Replace depracated psi_enable_msi with pci_alloc_irq_vectors.
> And as a result modify how the returned value is handled.
> 
> Signed-off-by: Suraj Upadhyay <usuraj35@...il.com>
> ---
>  drivers/staging/media/ipu3/ipu3.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/media/ipu3/ipu3.c b/drivers/staging/media/ipu3/ipu3.c
> index ee1bba6bdcac..54690e7442be 100644
> --- a/drivers/staging/media/ipu3/ipu3.c
> +++ b/drivers/staging/media/ipu3/ipu3.c
> @@ -602,9 +602,9 @@ static irqreturn_t imgu_isr(int irq, void *imgu_ptr)
>  static int imgu_pci_config_setup(struct pci_dev *dev)
>  {
>  	u16 pci_command;
> -	int r = pci_enable_msi(dev);
> +	int r = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_MSI);
>  
> -	if (r) {
> +	if (r < 0) {
>  		dev_err(&dev->dev, "failed to enable MSI (%d)\n", r);
>  		return r;
>  	}

I believe fixing this requires also releasing it, i.e. a call to
pci_free_irq_vectors(). This seems to have been missing.

-- 
Kind regards,

Sakari Ailus