diff options
| author | Ingo Molnar <mingo@kernel.org> | 2015-03-03 07:34:33 +0100 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2015-04-01 12:46:22 +0100 |
| commit | 23a0d4e8fa6d3a1d7fb819f79bcc0a3739c30ba9 (patch) | |
| tree | a39fccdee6dc1a89756331aac0c4db066060e96c /arch/x86/platform/efi/efi.c | |
| parent | fed6cefe3b6e862dcc74d07324478caa07e84eaf (diff) | |
efi: Disable interrupts around EFI calls, not in the epilog/prolog calls
Tapasweni Pathak reported that we do a kmalloc() in efi_call_phys_prolog()
on x86-64 while having interrupts disabled, which is a big no-no, as
kmalloc() can sleep.
Solve this by removing the irq disabling from the prolog/epilog calls
around EFI calls: it's unnecessary, as in this stage we are single
threaded in the boot thread, and we don't ever execute this from
interrupt contexts.
Reported-by: Tapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'arch/x86/platform/efi/efi.c')
| -rw-r--r-- | arch/x86/platform/efi/efi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index e859d56ce9f8..e7a01e32db95 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -85,12 +85,19 @@ static efi_status_t __init phys_efi_set_virtual_address_map( efi_memory_desc_t *virtual_map) { efi_status_t status; + unsigned long flags; efi_call_phys_prolog(); + + /* Disable interrupts around EFI calls: */ + local_irq_save(flags); status = efi_call_phys(efi_phys.set_virtual_address_map, memory_map_size, descriptor_size, descriptor_version, virtual_map); + local_irq_restore(flags); + efi_call_phys_epilog(); + return status; } |