[PATCH 08/17] Allow efi_free() to be called with size of 0, and do nothing in that case.
From: Roy Franz <hidden>
Date: 2013-08-07 03:47:37
Also in:
linux-efi, lkml
Subsystem:
extensible firmware interface (efi), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Ard Biesheuvel, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Make efi_free() safely callable with size of 0, similar to free() being callable with NULL pointers. Remove size checks that this makes redundant. This also avoids some size checks in the ARM EFI stub code that will be added as well. Signed-off-by: Roy Franz <redacted> --- arch/x86/boot/compressed/eboot.c | 3 +-- drivers/firmware/efi/efi-stub-helper.c | 3 +++ 2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index f44ef2f..bcfdcc2 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c@@ -537,8 +537,7 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table) return boot_params; fail2: - if (options_size) - efi_free(sys_table, options_size, hdr->cmd_line_ptr); + efi_free(sys_table, options_size, hdr->cmd_line_ptr); fail: efi_free(sys_table, 0x4000, (unsigned long)boot_params); return NULL;
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index 8582650..bce0473 100644
--- a/drivers/firmware/efi/efi-stub-helper.c
+++ b/drivers/firmware/efi/efi-stub-helper.c@@ -253,6 +253,9 @@ static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size, { unsigned long nr_pages; + if (!size) + return; + nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; efi_call_phys2(sys_table_arg->boottime->free_pages, addr, nr_pages); }
--
1.7.10.4