linux-kernel - Re: [PATCH] xen/pcifront: Removed unnecessary _

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Date:   Mon, 30 Aug 2021 06:55:24 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Sergio Miguéns Iglesias <lonyelon@...il.com>,
        konrad.wilk@...cle.com
Cc:     boris.ostrovsky@...cle.com, sstabellini@...nel.org,
        bhelgaas@...gle.com, xen-devel@...ts.xenproject.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sergio Miguéns Iglesias <sergio@...y.xyz>
Subject: Re: [PATCH] xen/pcifront: Removed unnecessary __ref annotation

On 30.08.21 00:14, Sergio Miguéns Iglesias wrote:
> An unnecessary "__ref" annotation was removed from the
> "drivers/pci/xen_pcifront.c" file. The function where the annotation
> was used was "pcifront_backend_changed()", which does not call any
> functions annotated as "__*init" nor "__*exit". This makes "__ref"
> unnecessary since this annotation is used to make the compiler ignore
> section miss-matches when they are not happening here in the first
> place.
> 
> In addition to the aforementioned change, some code style issues were
> fixed in the same file.
> 
> Signed-off-by: Sergio Miguéns Iglesias <sergio@...y.xyz>
> ---
>   drivers/pci/xen-pcifront.c | 24 ++++++++++++++----------
>   1 file changed, 14 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
> index b7a8f3a1921f..f06661704f3a 100644
> --- a/drivers/pci/xen-pcifront.c
> +++ b/drivers/pci/xen-pcifront.c
> @@ -115,7 +115,7 @@ static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
>   	struct xen_pci_op *active_op = &pdev->sh_info->op;
>   	unsigned long irq_flags;
>   	evtchn_port_t port = pdev->evtchn;
> -	unsigned irq = pdev->irq;
> +	unsigned int irq = pdev->irq;
>   	s64 ns, ns_timeout;
>   
>   	spin_lock_irqsave(&pdev->sh_info_lock, irq_flags);
> @@ -152,11 +152,10 @@ static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
>   		}
>   	}
>   
> -	/*
> -	* We might lose backend service request since we
> -	* reuse same evtchn with pci_conf backend response. So re-schedule
> -	* aer pcifront service.
> -	*/
> +	/* We might lose backend service request since we

This is no net or drivers/net file, so please keep the initial "/*"
line and fixup the other multi-line comments accordingly.

> +	 * reuse same evtchn with pci_conf backend response. So re-schedule
> +	 * aer pcifront service.
> +	 */
>   	if (test_bit(_XEN_PCIB_active,
>   			(unsigned long *)&pdev->sh_info->flags)) {
>   		dev_err(&pdev->xdev->dev,
> @@ -493,7 +492,8 @@ static int pcifront_scan_root(struct pcifront_device *pdev,
>   	list_add(&bus_entry->list, &pdev->root_buses);
>   
>   	/* pci_scan_root_bus skips devices which do not have a
> -	* devfn==0. The pcifront_scan_bus enumerates all devfn. */
> +	 * devfn==0. The pcifront_scan_bus enumerates all devfn.
> +	 */
>   	err = pcifront_scan_bus(pdev, domain, bus, b);
>   
>   	/* Claim resources before going "live" with our devices */
> @@ -651,8 +651,9 @@ static void pcifront_do_aer(struct work_struct *data)
>   	pci_channel_state_t state =
>   		(pci_channel_state_t)pdev->sh_info->aer_op.err;
>   
> -	/*If a pci_conf op is in progress,
> -		we have to wait until it is done before service aer op*/
> +	/* If a pci_conf op is in progress, we have to wait until it is done
> +	 * before service aer op
> +	 */
>   	dev_dbg(&pdev->xdev->dev,
>   		"pcifront service aer bus %x devfn %x\n",
>   		pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn);
> @@ -676,6 +677,7 @@ static void pcifront_do_aer(struct work_struct *data)
>   static irqreturn_t pcifront_handler_aer(int irq, void *dev)
>   {
>   	struct pcifront_device *pdev = dev;
> +
>   	schedule_pcifront_aer_op(pdev);
>   	return IRQ_HANDLED;
>   }
> @@ -1027,6 +1029,7 @@ static int pcifront_detach_devices(struct pcifront_device *pdev)
>   	/* Find devices being detached and remove them. */
>   	for (i = 0; i < num_devs; i++) {
>   		int l, state;
> +
>   		l = snprintf(str, sizeof(str), "state-%d", i);
>   		if (unlikely(l >= (sizeof(str) - 1))) {
>   			err = -ENOMEM;
> @@ -1078,7 +1081,7 @@ static int pcifront_detach_devices(struct pcifront_device *pdev)
>   	return err;
>   }
>   
> -static void __ref pcifront_backend_changed(struct xenbus_device *xdev,
> +static void pcifront_backend_changed(struct xenbus_device *xdev,
>   						  enum xenbus_state be_state)
>   {
>   	struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
> @@ -1137,6 +1140,7 @@ static int pcifront_xenbus_probe(struct xenbus_device *xdev,
>   static int pcifront_xenbus_remove(struct xenbus_device *xdev)
>   {
>   	struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
> +
>   	if (pdev)
>   		free_pdev(pdev);
>   
> 

Juergen

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