linux-kernel - [ 106/120] efi: initialize efi.runtime_version to make query_variable_info/update

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Message-Id: <20121011005846.688947782@linuxfoundation.org>
Date:	Thu, 11 Oct 2012 10:00:58 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Seiji Aguchi <seiji.aguchi@....com>,
	Matthew Garrett <mjg@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Ivan Hu <ivan.hu@...onical.com>
Subject: [ 106/120] efi: initialize efi.runtime_version to make query_variable_info/update_capsule workable

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Seiji Aguchi <seiji.aguchi@....com>

commit d6cf86d8f23253225fe2a763d627ecf7dfee9dae upstream.

A value of efi.runtime_version is checked before calling
update_capsule()/query_variable_info() as follows.
But it isn't initialized anywhere.

<snip>
static efi_status_t virt_efi_query_variable_info(u32 attr,
                                                 u64 *storage_space,
                                                 u64 *remaining_space,
                                                 u64 *max_variable_size)
{
        if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
                return EFI_UNSUPPORTED;
<snip>

This patch initializes a value of efi.runtime_version at boot time.

Signed-off-by: Seiji Aguchi <seiji.aguchi@....com>
Acked-by: Matthew Garrett <mjg@...hat.com>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
Signed-off-by: Ivan Hu <ivan.hu@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/platform/efi/efi.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -890,6 +890,7 @@ void __init efi_enter_virtual_mode(void)
 	 *
 	 * Call EFI services through wrapper functions.
 	 */
+	efi.runtime_version = efi_systab.fw_revision;
 	efi.get_time = virt_efi_get_time;
 	efi.set_time = virt_efi_set_time;
 	efi.get_wakeup_time = virt_efi_get_wakeup_time;


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