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mtd: mtdconcat: fix bug with uninitialized lock and unlock functions 

Test if a lock or unlock function is present (pointer not NULL) before
calling it, to prevent a kernel dump.

Artem: removed extra blank lines

Signed-off-by: Martin Krause <martin.krause@tqs.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Martin Krause 2010-06-22 15:00:19 +02:00 committed by David Woodhouse
parent 24cc7b8a2a
commit e1d0fe3cdd
1 changed files with 12 additions and 8 deletions
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20
drivers/mtd/mtdconcat.c
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@ -540,10 +540,12 @@ static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
else
size = len;
err = subdev->lock(subdev, ofs, size);
if (err)
break;
if (subdev->lock) {
err = subdev->lock(subdev, ofs, size);
if (err)
break;
} else
err = -EOPNOTSUPP;
len -= size;
if (len == 0)
@ -578,10 +580,12 @@ static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
else
size = len;
err = subdev->unlock(subdev, ofs, size);
if (err)
break;
if (subdev->unlock) {
err = subdev->unlock(subdev, ofs, size);
if (err)
break;
} else
err = -EOPNOTSUPP;
len -= size;
if (len == 0)