linux-kernel - Re: [PATCH 1/4] ACPICA: take ACPI_MTX_INTERPRETER in acpi_unload_table

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Message-ID: <2246788.mX5nmqqL2I@vostro.rjw.lan>
Date:	Fri, 30 Jan 2015 01:03:48 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	linus.walleij@...aro.org, lee.jones@...aro.org, johan@...nel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, heikki.krogerus@...el.com,
	mika.westerberg@...ux.intel.com, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 1/4] ACPICA: take ACPI_MTX_INTERPRETER in acpi_unload_table_id

On Tuesday, December 16, 2014 06:12:30 PM Octavian Purdila wrote:
> acpi_tb_delete_namespace_by_owner expects ACPI_MTX_INTERPRETER to be
> taken. This fixes the following issue:
> 
> ACPI Error: Mutex [0x0] is not acquired, cannot release (20141107/utmutex-322)
> Call Trace:
>   [<ffffffff81b0bd28>] dump_stack+0x4f/0x7b
>   [<ffffffff81546bfc>] acpi_ut_release_mutex+0x47/0x67
>   [<ffffffff81542cf1>] acpi_tb_delete_namespace_by_owner+0x57/0x8d
>   [<ffffffff81543ef1>] acpi_unload_table_id+0x3a/0x5e
> 
> Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>

I've queued up this one for 3.20.

> ---
>  drivers/acpi/acpica/tbxface.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c
> index 6482b0d..9520ae1 100644
> --- a/drivers/acpi/acpica/tbxface.c
> +++ b/drivers/acpi/acpica/tbxface.c
> @@ -281,6 +281,11 @@ acpi_status acpi_unload_table_id(acpi_owner_id id)
>  
>  	ACPI_FUNCTION_TRACE(acpi_unload_table_id);
>  
> +	status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
> +	if (ACPI_FAILURE(status)) {
> +		return_ACPI_STATUS(status);
> +	}
> +
>  	/* Find table in the global table list */
>  	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
>  		if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
> @@ -297,6 +302,8 @@ acpi_status acpi_unload_table_id(acpi_owner_id id)
>  		acpi_tb_set_table_loaded_flag(i, FALSE);
>  		break;
>  	}
> +
> +	(void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
>  	return_ACPI_STATUS(status);
>  }
>  
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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