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mtd: fix MTD suspend 

Commits 3fe4bae884 and
079c985e7a broke MTD suspend in 2 ways:

1. When the '->suspend' method is not present, we return -EOPNOTSUPP, but
   the callers of 'mtd_suspend()' expects 0 instead.
2. Checking of the 'mtd' parameter against NULL has been incorrectly removed
   in 'mtd_cls_suspend()'.

This patch fixes the breakages. This has been found, analyzed, reported
and tested by Rafael J. Wysocki <rjw@sisk.pl>.

Note, this patch is not needed in the stable tree because it causes a
regression introduced during the v3.3 merge window.

Reported-by: Rafael J. Wysocki <rjw@sisk.pl>
Tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2012-01-16 11:07:16 +02:00 committed by David Woodhouse
parent bce41d601e
commit 1a30871fe6
2 changed files with 2 additions and 4 deletions
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2
drivers/mtd/mtdcore.c
View File

@ -119,7 +119,7 @@ static int mtd_cls_suspend(struct device *dev, pm_message_t state)
{
struct mtd_info *mtd = dev_get_drvdata(dev);
return mtd_suspend(mtd);
return mtd ? mtd_suspend(mtd) : 0;
}
static int mtd_cls_resume(struct device *dev)

4
include/linux/mtd/mtd.h
View File

@ -427,9 +427,7 @@ static inline int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
static inline int mtd_suspend(struct mtd_info *mtd)
{
if (!mtd->suspend)
return -EOPNOTSUPP;
return mtd->suspend(mtd);
return mtd->suspend ? mtd->suspend(mtd) : 0;
}
static inline void mtd_resume(struct mtd_info *mtd)