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Merge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull EFI fixes from Ingo Molnar:
 "Two EFI fixes: a quirk for weird systabs, plus add more robust error
  handling in the old 1:1 mapping code"

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi: Allow the number of EFI configuration tables entries to be zero
  efi/x86/Add missing error handling to old_memmap 1:1 mapping code
This commit is contained in:
Linus Torvalds 2019-06-02 11:06:13 -07:00
commit af0424522d
4 changed files with 14 additions and 3 deletions
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2
arch/x86/platform/efi/efi.c
View File

@ -85,6 +85,8 @@ static efi_status_t __init phys_efi_set_virtual_address_map(
pgd_t *save_pgd;
save_pgd = efi_call_phys_prolog();
if (!save_pgd)
return EFI_ABORTED;
/* Disable interrupts around EFI calls: */
local_irq_save(flags);

9
arch/x86/platform/efi/efi_64.c
View File

@ -84,13 +84,15 @@ pgd_t * __init efi_call_phys_prolog(void)
if (!efi_enabled(EFI_OLD_MEMMAP)) {
efi_switch_mm(&efi_mm);
return NULL;
return efi_mm.pgd;
}
early_code_mapping_set_exec(1);
n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
save_pgd = kmalloc_array(n_pgds, sizeof(*save_pgd), GFP_KERNEL);
if (!save_pgd)
return NULL;
/*
* Build 1:1 identity mapping for efi=old_map usage. Note that
@ -138,10 +140,11 @@ pgd_t * __init efi_call_phys_prolog(void)
pgd_offset_k(pgd * PGDIR_SIZE)->pgd &= ~_PAGE_NX;
}
out:
__flush_tlb_all();
return save_pgd;
out:
efi_call_phys_epilog(save_pgd);
return NULL;
}
void __init efi_call_phys_epilog(pgd_t *save_pgd)

3
arch/x86/platform/efi/quirks.c
View File

@ -513,6 +513,9 @@ int __init efi_reuse_config(u64 tables, int nr_tables)
void *p, *tablep;
struct efi_setup_data *data;
if (nr_tables == 0)
return 0;
if (!efi_setup)
return 0;

3
drivers/firmware/efi/efi.c
View File

@ -636,6 +636,9 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables)
void *config_tables;
int sz, ret;
if (efi.systab->nr_tables == 0)
return 0;
if (efi_enabled(EFI_64BIT))
sz = sizeof(efi_config_table_64_t);
else