Using this parameter one can disable the storage_size/2 check if he is really sure that the UEFI does sane gc and fulfills the spec.
This parameter is useful if a devices uses more than 50% of the storage by default. The Intel DQSW67 desktop board is such an sucker for exmaple. Signed-off-by: Richard Weinberger <rich...@nod.at> --- arch/x86/platform/efi/efi.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index 3f96a48..1b0efb6 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -41,6 +41,7 @@ #include <linux/io.h> #include <linux/reboot.h> #include <linux/bcd.h> +#include <linux/module.h> #include <asm/setup.h> #include <asm/efi.h> @@ -71,6 +72,13 @@ static efi_system_table_t efi_systab __initdata; unsigned long x86_efi_facility; +static bool efivars_no_storage_paranoia; +module_param_named(no_storage_paranoia, efivars_no_storage_paranoia, bool, 0644); +MODULE_PARM_DESC(no_storage_paranoia, "Use this parameter only if you are very" + " sure that your EFI implemenation does sane garbage" + " collection and fulfills the UEFI spec." + " Otherwise your board may brick." + " See: http://mjg59.dreamwidth.org/#entry-22855";); /* * Returns 1 if 'facility' is enabled, 0 otherwise. */ @@ -1023,7 +1031,10 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) " is returning MaxVariableSize=0\n"); if (!storage_size || size > remaining_size || - (max_size && size > max_size) || + (max_size && size > max_size)) + return EFI_OUT_OF_RESOURCES; + + if (!efivars_no_storage_paranoia && (remaining_size - size) < (storage_size / 2)) return EFI_OUT_OF_RESOURCES; -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
