linux-kernel - Re: [PATCH] efi/fdt: Indentation fix

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Date:   Tue, 02 Oct 2018 09:05:51 -0700
From:   Joe Perches <joe@...ches.com>
To:     Julien Thierry <julien.thierry@....com>, linux-efi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH] efi/fdt: Indentation fix

On Mon, 2018-10-01 at 11:29 +0100, Julien Thierry wrote:
> Closing bracket seems to end a for statement when it is actually ending
> the contained if.
> 
> No functional change/fix, just fix the indentation.
[]
> diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
[]
> @@ -381,7 +381,7 @@ void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
>  			}
>  			*fdt_size = fdt_totalsize(fdt);
>  			break;
> -	 }
> +		}
> 
>  	return fdt;
>  }

Hello Julian.

[trivial style bikeshedding follows]

I think it better to add braces to the for loop so
this stands out better.

Also, I would generally write this so the if test is
reversed and uses a continue so the match block saves
an indent level.

This is the only use efi_guidcmp with a == test in
drivers/firmware, so perhaps remove that and use ! as
the other uses have no == or != test.

Lastly, a direct return might be better and the return
fdt could be removed and converted to return NULL.

Something like:
---
 drivers/firmware/efi/libstub/fdt.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
index 8830fa601e45..2d0b895e2f67 100644
--- a/drivers/firmware/efi/libstub/fdt.c
+++ b/drivers/firmware/efi/libstub/fdt.c
@@ -366,22 +366,23 @@ 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;
+	tables = (efi_config_table_t *)sys_table->tables;
 
-	for (i = 0; i < sys_table->nr_tables; i++)
-		if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
-			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;
-	 }
+	for (i = 0; i < sys_table->nr_tables; i++) {
+		void *fdt;
+
+		if (efi_guidcmp(tables[i].guid, fdt_guid))
+			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);
+		return fdt;
+	}
 
-	return fdt;
+	return NULL;
 }