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efivars: check for EFI_RUNTIME_SERVICES

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The efivars code requires EFI runtime services to function, so check
that they are enabled.

This fixes a crash when booting with the "noefi" kernel parameter, and
also when mixing kernel and firmware "bitness", e.g. 32-bit kernel with
64-bit firmware.

Tested-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
(cherry picked from commit d320c079ef)
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Matt Fleming
2013-07-11 07:30:33 +01:00
committed by Mark Brown
parent bb0145e4e0
commit b082f48205
1 changed files with 3 additions and 0 deletions
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3
drivers/firmware/efi/efivars.c
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@@ -583,6 +583,9 @@ int efivars_sysfs_init(void)
struct kobject *parent_kobj = efivars_kobject();
int error = 0;
if (!efi_enabled(EFI_RUNTIME_SERVICES))
return -ENODEV;
/* No efivars has been registered yet */
if (!parent_kobj)
return 0;