[PATCH 2/2] mtdinfo: fix `--all' for non-consecutive device numbers

[Brian Norris <computersforpeace@gmail.com>]

When we have assigned non-consecutive device numbers to our MTD devices,
then we run `mtdinfo --all', we get errors once mtdinfo tries to process
the devices in the "hole". For instance, suppose that at boot time, we have
one MTD (/dev/mtd0) then perform a sequence like the following:

 # modprobe mtdram
 # modprobe nandsim
 # rmmod mtdram

Then at this point, we have should have devices 0 and 2 without 1. Then:

 # mtdinfo --all
 ...
 mtdinfo: error!: mtd1 does not correspond to any existing MTD device

We add a check to first see if device is present, then continue to the next
ID if it doesn't exist.

Reported-by: Brian Foster <brian.foster@maxim-ic.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
 ubi-utils/mtdinfo.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/ubi-utils/mtdinfo.c b/ubi-utils/mtdinfo.c
index ead4bce..d25595a 100644
--- a/ubi-utils/mtdinfo.c
+++ b/ubi-utils/mtdinfo.c
@@ -378,6 +378,8 @@ static int print_general_info(libmtd_t libmtd, const struct mtd_info *mtd_info,
 
 	for (i = mtd_info->lowest_mtd_num;
 	     i <= mtd_info->highest_mtd_num; i++) {
+		if (!mtd_dev_present(libmtd, i))
+			continue;
 		err = print_dev_info(libmtd, mtd_info, i);
 		if (err)
 			return err;
-- 
1.7.5.4