mtd: nand: initialize ops.mode

Our `ops' information was converted to a local variable recently, and
apparently, old code relied on the fact that the global version was
often left in a valid mode. We can't make this assumption on local
structs, and we shouldn't be relying on a previous state anyway.

Instead, we initialize mode to 0 for don't-care situations (i.e., the
operation does not use OOB anyway) and MTD_OPS_PLACE_OOB when we want to
place OOB data.

This fixes a bug with nand_default_block_markbad(), where we catch on
the BUG() call in nand_fill_oob():

Kernel bug detected[#1]:
...
Call Trace:
[<80307350>] nand_fill_oob.clone.5+0xa4/0x15c
[<803075d8>] nand_do_write_oob+0x1d0/0x260
[<803077c4>] nand_default_block_markbad+0x15c/0x1a8
[<802e8c2c>] part_block_markbad+0x80/0x98
[<802ebc74>] mtd_ioctl+0x6d8/0xbd0
[<802ec1a4>] mtd_unlocked_ioctl+0x38/0x5c
[<800d9c60>] do_vfs_ioctl+0xa4/0x6e4
[<800da2e4>] sys_ioctl+0x44/0xa0
[<8001381c>] stack_done+0x20/0x40

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 51653d9e1438..3ed9c5e4d34e 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -420,6 +420,7 @@ static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
                 ops.datbuf = NULL;
                 ops.oobbuf = buf;
                 ops.ooboffs = chip->badblockpos & ~0x01;
+                ops.mode = MTD_OPS_PLACE_OOB;
                 do {
                         ret = nand_do_write_oob(mtd, ofs, &ops);
 
@@ -1596,6 +1597,7 @@ static int nand_read(struct mtd_info *mtd, loff_t from, size_t len,
         ops.len = len;
         ops.datbuf = buf;
         ops.oobbuf = NULL;
+        ops.mode = 0;
 
         ret = nand_do_read_ops(mtd, from, &ops);
 
@@ -2306,6 +2308,7 @@ static int panic_nand_write(struct mtd_info *mtd, loff_t to, size_t len,
         ops.len = len;
         ops.datbuf = (uint8_t *)buf;
         ops.oobbuf = NULL;
+        ops.mode = 0;
 
         ret = nand_do_write_ops(mtd, to, &ops);
 
@@ -2341,6 +2344,7 @@ static int nand_write(struct mtd_info *mtd, loff_t to, size_t len,
         ops.len = len;
         ops.datbuf = (uint8_t *)buf;
         ops.oobbuf = NULL;
+        ops.mode = 0;
 
         ret = nand_do_write_ops(mtd, to, &ops);