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x86/efi: Delete out-of-date comments of efi_query_variable_store 

For now we only ensure about 5kb free space for avoiding our board
refusing boot. But the comment lies that we retain 50% space.

Signed-off-by: Madper Xie <cxie@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Madper Xie 2013-11-10 22:15:11 +08:00 committed by Matt Fleming
parent aca32b5768
commit 5db80c6514
1 changed files with 5 additions and 7 deletions
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12
arch/x86/platform/efi/efi.c
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@ -1110,9 +1110,8 @@ u64 efi_mem_attributes(unsigned long phys_addr)
}
/*
* Some firmware has serious problems when using more than 50% of the EFI
* variable store, i.e. it triggers bugs that can brick machines. Ensure that
* we never use more than this safe limit.
* Some firmware implementations refuse to boot if there's insufficient space
* in the variable store. Ensure that we never use more than a safe limit.
*
* Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable
* store.
@ -1131,10 +1130,9 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
return status;
/*
* Some firmware implementations refuse to boot if there's insufficient
* space in the variable store. We account for that by refusing the
* write if permitting it would reduce the available space to under
* 5KB. This figure was provided by Samsung, so should be safe.
* We account for that by refusing the write if permitting it would
* reduce the available space to under 5KB. This figure was provided by
* Samsung, so should be safe.
*/
if ((remaining_size - size < EFI_MIN_RESERVE) &&
!efi_no_storage_paranoia) {