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Diffstat (limited to 'target/linux/generic/patches-4.4/040-0002-mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch')
-rw-r--r--target/linux/generic/patches-4.4/040-0002-mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch93
1 files changed, 93 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/040-0002-mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch b/target/linux/generic/patches-4.4/040-0002-mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch
new file mode 100644
index 0000000000..8a04852bc4
--- /dev/null
+++ b/target/linux/generic/patches-4.4/040-0002-mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch
@@ -0,0 +1,93 @@
+From 36bcc0c9c2bc8f56569cd735ba531a51358d7c2b Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Sun, 6 Dec 2015 11:31:38 +0100
+Subject: [PATCH] mtd: bcm47xxpart: don't fail because of bit-flips
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Bit-flip errors may occur on NAND flashes and are harmless. Handle them
+gracefully as read content is still reliable and can be parsed.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/bcm47xxpart.c | 38 ++++++++++++++++++++++----------------
+ 1 file changed, 22 insertions(+), 16 deletions(-)
+
+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -66,11 +66,13 @@ static const char *bcm47xxpart_trx_data_
+ {
+ uint32_t buf;
+ size_t bytes_read;
++ int err;
+
+- if (mtd_read(master, offset, sizeof(buf), &bytes_read,
+- (uint8_t *)&buf) < 0) {
+- pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
+- offset);
++ err = mtd_read(master, offset, sizeof(buf), &bytes_read,
++ (uint8_t *)&buf);
++ if (err && !mtd_is_bitflip(err)) {
++ pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
++ offset, err);
+ goto out_default;
+ }
+
+@@ -95,6 +97,7 @@ static int bcm47xxpart_parse(struct mtd_
+ int trx_part = -1;
+ int last_trx_part = -1;
+ int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
++ int err;
+
+ /*
+ * Some really old flashes (like AT45DB*) had smaller erasesize-s, but
+@@ -128,10 +131,11 @@ static int bcm47xxpart_parse(struct mtd_
+ }
+
+ /* Read beginning of the block */
+- if (mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
+- &bytes_read, (uint8_t *)buf) < 0) {
+- pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
+- offset);
++ err = mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
++ &bytes_read, (uint8_t *)buf);
++ if (err && !mtd_is_bitflip(err)) {
++ pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
++ offset, err);
+ continue;
+ }
+
+@@ -254,10 +258,11 @@ static int bcm47xxpart_parse(struct mtd_
+ }
+
+ /* Read middle of the block */
+- if (mtd_read(master, offset + 0x8000, 0x4,
+- &bytes_read, (uint8_t *)buf) < 0) {
+- pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
+- offset);
++ err = mtd_read(master, offset + 0x8000, 0x4, &bytes_read,
++ (uint8_t *)buf);
++ if (err && !mtd_is_bitflip(err)) {
++ pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
++ offset, err);
+ continue;
+ }
+
+@@ -277,10 +282,11 @@ static int bcm47xxpart_parse(struct mtd_
+ }
+
+ offset = master->size - possible_nvram_sizes[i];
+- if (mtd_read(master, offset, 0x4, &bytes_read,
+- (uint8_t *)buf) < 0) {
+- pr_err("mtd_read error while reading at offset 0x%X!\n",
+- offset);
++ err = mtd_read(master, offset, 0x4, &bytes_read,
++ (uint8_t *)buf);
++ if (err && !mtd_is_bitflip(err)) {
++ pr_err("mtd_read error while reading (offset 0x%X): %d\n",
++ offset, err);
+ continue;
+ }
+