kernel: use accepted version of bcm47xxpart fix commit

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 0 insertions, 65 deletions

diff --git a/target/linux/generic/pending-4.9/142-mtd-bcm47xxpart-improve-handling-TRX-partition-size.patch b/target/linux/generic/pending-4.9/142-mtd-bcm47xxpart-improve-handling-TRX-partition-size.patch
deleted file mode 100644
index 60c8ecbdc5..0000000000
--- a/target/linux/generic/pending-4.9/142-mtd-bcm47xxpart-improve-handling-TRX-partition-size.patch
+++ /dev/null
@@ -1,65 +0,0 @@
-From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
-Subject: [PATCH] mtd: bcm47xxpart: improve handling TRX partition size
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-When bcm47xxpart finds a TRX partition (container) it's supposed to jump
-to the end of it and keep looking for more partitions. TRX and its
-subpartitions are handled be a separated parser.
-
-The problem with old code was relying on the length specified in a TRX
-header. That isn't reliable as TRX is commonly modified to have checksum
-cover only non-changing subpartitions. Otherwise modifying e.g. a rootfs
-would result in CRC32 mismatch and bootloader refusing to boot a
-firmware.
-
-Fix it by trying better to figure out a real TRX size. We can securely
-assume that TRX has to cover all subpartitions and the last one is at
-least of a block size in size. Then compare it with a length field.
-
-This makes code more optimal & reliable thanks to skipping data that
-shouldn't be parsed.
-
-Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
----
-
---- a/drivers/mtd/bcm47xxpart.c
-+++ b/drivers/mtd/bcm47xxpart.c
-@@ -186,6 +186,8 @@ static int bcm47xxpart_parse(struct mtd_
- 		/* TRX */
- 		if (buf[0x000 / 4] == TRX_MAGIC) {
- 			struct trx_header *trx;
-+			uint32_t last_subpart;
-+			uint32_t trx_size;
- 
- 			if (trx_num >= ARRAY_SIZE(trx_parts))
- 				pr_warn("No enough space to store another TRX found at 0x%X\n",
-@@ -195,11 +197,23 @@ static int bcm47xxpart_parse(struct mtd_
- 			bcm47xxpart_add_part(&parts[curr_part++], "firmware",
- 					     offset, 0);
- 
--			/* Jump to the end of TRX */
-+			/*
-+			 * Try to find TRX size. The "length" field isn't fully
-+			 * reliable as it could be decreased to make CRC32 cover
-+			 * only part of TRX data. It's commonly used as checksum
-+			 * can't cover e.g. ever-changing rootfs partition.
-+			 * Use offsets as helpers for assuming min TRX size.
-+			 */
- 			trx = (struct trx_header *)buf;
--			offset = roundup(offset + trx->length, blocksize);
--			/* Next loop iteration will increase the offset */
--			offset -= blocksize;
-+			last_subpart = max3(trx->offset[0], trx->offset[1],
-+					    trx->offset[2]);
-+			trx_size = max(trx->length, last_subpart + blocksize);
-+
-+			/*
-+			 * Skip the TRX data. Decrease offset by block size as
-+			 * the next loop iteration will increase it.
-+			 */
-+			offset += roundup(trx_size, blocksize) - blocksize;
- 			continue;
- 		}
-