ExternalVendorCode/openwrt
1
0
Fork 0
mirror of https://github.com/openwrt/openwrt.git synced 2024-12-24 07:46:48 +00:00
Code Issues Actions 5 Packages Projects Releases Wiki Activity

kernel: add the ubifs EOF marker support to 3.14 kernel

Browse Source 
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
This commit is contained in:
John Crispin 2014-11-17 08:34:03 +00:00
parent 28b26fa603
commit 5d2c810101
1 changed files with 51 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
target/linux/generic/patches-3.14/490-mtd-ubi-add-EOF-marker-support.patch Normal file
View File

@ -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;
};