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efi/fdt: Simplify the get_fdt() flow

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Reorganize the get_fdt() lookup loop, clearly showing that:

- Nothing is done for table entries that do not have fdt_guid
- Once an entry with fdt_guid is found, break out of the loop

No functional changes.

Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arend van Spriel <arend.vanspriel@broadcom.com>
Cc: Bhupesh Sharma <bhsharma@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Eric Snowberg <eric.snowberg@oracle.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Jon Hunter <jonathanh@nvidia.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: YiFei Zhu <zhuyifei1999@gmail.com>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20181129171230.18699-4-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Julien Thierry 2018-11-29 18:12:22 +01:00 committed by Ingo Molnar
parent 6935b3c43d
commit 8c25db0a5a
1 changed files with 13 additions and 12 deletions
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15
drivers/firmware/efi/libstub/fdt.c
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@ -370,23 +370,24 @@ void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
{
efi_guid_t fdt_guid = DEVICE_TREE_GUID;
efi_config_table_t *tables;
void *fdt;
int i;
tables = (efi_config_table_t *)sys_table->tables;
fdt = NULL;
for (i = 0; i < sys_table->nr_tables; i++) {
if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
void *fdt;
if (efi_guidcmp(tables[i].guid, fdt_guid) != 0)
continue;
fdt = (void *)tables[i].table;
if (fdt_check_header(fdt) != 0) {
pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
return NULL;
}
*fdt_size = fdt_totalsize(fdt);
break;
}
}
return fdt;
}
return NULL;
}