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authorJohn Crispin <john@openwrt.org>2014-11-17 08:34:03 +0000
committerJohn Crispin <john@openwrt.org>2014-11-17 08:34:03 +0000
commit5d2c8101011425ddc25700493966c988ed476fe4 (patch)
tree6d42d51a30fe4a7459e522b154d6751fa23be08a
parent28b26fa603ec8931a35c618193f210444c5670f6 (diff)
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kernel: add the ubifs EOF marker support to 3.14 kernel
Without this patch the UBIFS driver is unable to attach to the mtd storage and mount the root FS. Fixes a kernel panic with Netgear WNDR4300/3700v4 devices. Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it> SVN-Revision: 43287
-rw-r--r--target/linux/generic/patches-3.14/490-mtd-ubi-add-EOF-marker-support.patch51
1 files changed, 51 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.14/490-mtd-ubi-add-EOF-marker-support.patch b/target/linux/generic/patches-3.14/490-mtd-ubi-add-EOF-marker-support.patch
new file mode 100644
index 0000000000..cd02c13e0c
--- /dev/null
+++ b/target/linux/generic/patches-3.14/490-mtd-ubi-add-EOF-marker-support.patch
@@ -0,0 +1,51 @@
+--- a/drivers/mtd/ubi/attach.c
++++ b/drivers/mtd/ubi/attach.c
+@@ -800,6 +800,13 @@ out_unlock:
+ return err;
+ }
+
++static bool ec_hdr_has_eof(struct ubi_ec_hdr *ech)
++{
++ return ech->padding1[0] == 'E' &&
++ ech->padding1[1] == 'O' &&
++ ech->padding1[2] == 'F';
++}
++
+ /**
+ * scan_peb - scan and process UBI headers of a PEB.
+ * @ubi: UBI device description object
+@@ -830,9 +837,21 @@ static int scan_peb(struct ubi_device *u
+ return 0;
+ }
+
+- err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
+- if (err < 0)
+- return err;
++ if (!ai->eof_found) {
++ err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
++ if (err < 0)
++ return err;
++
++ if (ec_hdr_has_eof(ech)) {
++ ubi_msg("EOF marker found, PEBs from %d will be erased",
++ pnum);
++ ai->eof_found = true;
++ }
++ }
++
++ if (ai->eof_found)
++ err = UBI_IO_FF_BITFLIPS;
++
+ switch (err) {
+ case 0:
+ break;
+--- a/drivers/mtd/ubi/ubi.h
++++ b/drivers/mtd/ubi/ubi.h
+@@ -701,6 +701,7 @@ struct ubi_attach_info {
+ int mean_ec;
+ uint64_t ec_sum;
+ int ec_count;
++ bool eof_found;
+ struct kmem_cache *aeb_slab_cache;
+ };
+