linux-kernel - Re: [PATCH 3.2 20/52] ACPI: Use correct IRQ when uninstalling ACPI interrupt handler

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Date:	Wed, 25 Nov 2015 02:37:52 +0000
From:	"Chen, Yu C" <yu.c.chen@...el.com>
To:	"ben@...adent.org.uk" <ben@...adent.org.uk>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Zheng, Lv" <lv.zheng@...el.com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 3.2 20/52] ACPI: Use correct IRQ when uninstalling ACPI
 interrupt handler

Hi, Ben, 
ok for me.

thanks,
Yu
On Tue, 2015-11-24 at 22:33 +0000, Ben Hutchings wrote:
> 3.2.74-rc1 review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Chen Yu <yu.c.chen@...el.com>
> 
> commit 49e4b84333f338d4f183f28f1f3c1131b9fb2b5a upstream.
> 
> Currently when the system is trying to uninstall the ACPI interrupt
> handler, it uses acpi_gbl_FADT.sci_interrupt as the IRQ number.
> However, the IRQ number that the ACPI interrupt handled is installed
> for comes from acpi_gsi_to_irq() and that is the number that should
> be used for the handler removal.
> 
> Fix this problem by using the mapped IRQ returned from acpi_gsi_to_irq()
> as appropriate.
> 
> Acked-by: Lv Zheng <lv.zheng@...el.com>
> Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> [bwh: Backported to 3.2: adjust context]
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> ---
>  drivers/acpi/osl.c   | 9 ++++++---
>  include/linux/acpi.h | 6 ++++++
>  2 files changed, 12 insertions(+), 3 deletions(-)
> 
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -82,6 +82,7 @@ static struct workqueue_struct *kacpid_w
>  static struct workqueue_struct *kacpi_notify_wq;
>  struct workqueue_struct *kacpi_hotplug_wq;
>  EXPORT_SYMBOL(kacpi_hotplug_wq);
> +unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
>  
>  struct acpi_res_list {
>  	resource_size_t start;
> @@ -566,17 +567,19 @@ acpi_os_install_interrupt_handler(u32 gs
>  		acpi_irq_handler = NULL;
>  		return AE_NOT_ACQUIRED;
>  	}
> +	acpi_sci_irq = irq;
>  
>  	return AE_OK;
>  }
>  
> -acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
> +acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
>  {
> -	if (irq != acpi_gbl_FADT.sci_interrupt)
> +	if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
>  		return AE_BAD_PARAMETER;
>  
> -	free_irq(irq, acpi_irq);
> +	free_irq(acpi_sci_irq, acpi_irq);
>  	acpi_irq_handler = NULL;
> +	acpi_sci_irq = INVALID_ACPI_IRQ;
>  
>  	return AE_OK;
>  }
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -110,6 +110,12 @@ int acpi_unregister_ioapic(acpi_handle h
>  void acpi_irq_stats_init(void);
>  extern u32 acpi_irq_handled;
>  extern u32 acpi_irq_not_handled;
> +extern unsigned int acpi_sci_irq;
> +#define INVALID_ACPI_IRQ	((unsigned)-1)
> +static inline bool acpi_sci_irq_valid(void)
> +{
> +	return acpi_sci_irq != INVALID_ACPI_IRQ;
> +}
>  
>  extern int sbf_port;
>  extern unsigned long acpi_realmode_flags;
>