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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH v2 5/6] pbl: compressed-dtb: use flexible array member to access data
Date: Wed, 13 Jul 2022 11:57:29 +0200	[thread overview]
Message-ID: <20220713095730.1878941-5-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20220713095730.1878941-1-a.fatoum@pengutronix.de>

While data = compressed_dtb + 1 has the equivalent effect of skipping
over the struct barebox_boarddata_compressed_dtb header, using a
flexible array member aids code readability, so use that instead.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2:
  - new patch
---
 arch/arm/cpu/start.c     | 7 ++-----
 arch/riscv/boot/start.c  | 6 ++----
 include/compressed-dtb.h | 1 +
 3 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/arm/cpu/start.c b/arch/arm/cpu/start.c
index 14cc310312ab..755d48851956 100644
--- a/arch/arm/cpu/start.c
+++ b/arch/arm/cpu/start.c
@@ -52,7 +52,6 @@ u32 barebox_arm_machine(void)
 void *barebox_arm_boot_dtb(void)
 {
 	void *dtb;
-	void *data;
 	int ret;
 	struct barebox_boarddata_compressed_dtb *compressed_dtb;
 	static void *boot_dtb;
@@ -76,10 +75,8 @@ void *barebox_arm_boot_dtb(void)
 	if (!dtb)
 		return NULL;
 
-	data = compressed_dtb + 1;
-
-	ret = uncompress(data, compressed_dtb->datalen, NULL, NULL,
-			dtb, NULL, NULL);
+	ret = uncompress(compressed_dtb->data, compressed_dtb->datalen,
+			 NULL, NULL, dtb, NULL, NULL);
 	if (ret) {
 		pr_err("uncompressing dtb failed\n");
 		free(dtb);
diff --git a/arch/riscv/boot/start.c b/arch/riscv/boot/start.c
index 72ab93cb7691..8b4c8bb2f019 100644
--- a/arch/riscv/boot/start.c
+++ b/arch/riscv/boot/start.c
@@ -32,7 +32,6 @@ unsigned barebox_riscv_pbl_flags;
 void *barebox_riscv_boot_dtb(void)
 {
 	void *dtb;
-	void *data;
 	int ret;
 	struct barebox_boarddata_compressed_dtb *compressed_dtb;
 	static void *boot_dtb;
@@ -56,9 +55,8 @@ void *barebox_riscv_boot_dtb(void)
 	if (!dtb)
 		return NULL;
 
-	data = compressed_dtb + 1;
-
-	ret = uncompress(data, compressed_dtb->datalen, NULL, NULL, dtb, NULL, NULL);
+	ret = uncompress(compressed_dtb->data, compressed_dtb->datalen,
+			 NULL, NULL, dtb, NULL, NULL);
 	if (ret) {
 		pr_err("uncompressing dtb failed\n");
 		free(dtb);
diff --git a/include/compressed-dtb.h b/include/compressed-dtb.h
index 1ba98a7e2b92..3359d1ee115d 100644
--- a/include/compressed-dtb.h
+++ b/include/compressed-dtb.h
@@ -10,6 +10,7 @@ struct barebox_boarddata_compressed_dtb {
 	u32 magic;
 	u32 datalen;
 	u32 datalen_uncompressed;
+	u8 data[];
 };
 
 static inline bool blob_is_compressed_fdt(const void *blob)
-- 
2.30.2




  parent reply	other threads:[~2022-07-13  9:59 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-13  9:57 [PATCH v2 1/6] common: don't allow compressing in-barebox binaries again Ahmad Fatoum
2022-07-13  9:57 ` [PATCH v2 2/6] pbl: make USE_COMPRESSED_DTB a PBL-only feature Ahmad Fatoum
2022-07-13  9:57 ` [PATCH v2 3/6] pbl: remove redundant select UNCOMRPESS Ahmad Fatoum
2022-07-13  9:57 ` [PATCH v2 4/6] kbuild: gen-dtb-s: use Makefile.lib instead of duplicating cmd_lzo Ahmad Fatoum
2022-07-13  9:57 ` Ahmad Fatoum [this message]
2022-07-13  9:57 ` [PATCH v2 6/6] kbuild: pbl: use same compression algo for both barebox and DTB Ahmad Fatoum
2022-07-15 10:53   ` Sascha Hauer
2022-07-15 15:57     ` [PATCH] fixup! " Ahmad Fatoum
2022-07-14  8:08 ` [PATCH v2 1/6] common: don't allow compressing in-barebox binaries again Sascha Hauer

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