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mtd: grab a reference to the MTD of_node before registering it 

We now stick the device node representing the current MTD (if any) into
sysfs, so let's make sure we have a reference to it before doing that.

Suggested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Brian Norris 2015-11-11 16:26:04 -08:00
parent 44ec23c9ec
commit 215a02fd30
1 changed files with 4 additions and 0 deletions
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4
drivers/mtd/mtdcore.c
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@ -32,6 +32,7 @@
#include <linux/err.h>
#include <linux/ioctl.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/proc_fs.h>
#include <linux/idr.h>
#include <linux/backing-dev.h>
@ -454,6 +455,7 @@ int add_mtd_device(struct mtd_info *mtd)
mtd->dev.devt = MTD_DEVT(i);
dev_set_name(&mtd->dev, "mtd%d", i);
dev_set_drvdata(&mtd->dev, mtd);
of_node_get(mtd_get_of_node(mtd));
error = device_register(&mtd->dev);
if (error)
goto fail_added;
@ -476,6 +478,7 @@ int add_mtd_device(struct mtd_info *mtd)
return 0;
fail_added:
of_node_put(mtd_get_of_node(mtd));
idr_remove(&mtd_idr, i);
fail_locked:
mutex_unlock(&mtd_table_mutex);
@ -517,6 +520,7 @@ int del_mtd_device(struct mtd_info *mtd)
device_unregister(&mtd->dev);
idr_remove(&mtd_idr, mtd->index);
of_node_put(mtd_get_of_node(mtd));
module_put(THIS_MODULE);
ret = 0;