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- From 1bd1b740f208d1cf4071932cc51860d37266c402 Mon Sep 17 00:00:00 2001
- From: Bernhard Frauendienst <kernel@nospam.obeliks.de>
- Date: Sat, 1 Sep 2018 00:30:11 +0200
- Subject: [PATCH 495/497] mtd: core: add get_mtd_device_by_node
- Add function to retrieve a mtd device by its OF node. Since drivers can
- assign arbitrary names to mtd devices in the absence of a label
- property, there is no other reliable way to retrieve a mtd device for a
- given OF node.
- Signed-off-by: Bernhard Frauendienst <kernel@nospam.obeliks.de>
- Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
- ---
- drivers/mtd/mtdcore.c | 38 ++++++++++++++++++++++++++++++++++++++
- include/linux/mtd/mtd.h | 2 ++
- 2 files changed, 40 insertions(+)
- --- a/drivers/mtd/mtdcore.c
- +++ b/drivers/mtd/mtdcore.c
- @@ -924,6 +924,44 @@ out_unlock:
- }
- EXPORT_SYMBOL_GPL(get_mtd_device_nm);
-
- +/**
- + * get_mtd_device_by_node - obtain a validated handle for an MTD device
- + * by of_node
- + * @of_node: OF node of MTD device to open
- + *
- + * This function returns MTD device description structure in case of
- + * success and an error code in case of failure.
- + */
- +struct mtd_info *get_mtd_device_by_node(const struct device_node *of_node)
- +{
- + int err = -ENODEV;
- + struct mtd_info *mtd = NULL, *other;
- +
- + mutex_lock(&mtd_table_mutex);
- +
- + mtd_for_each_device(other) {
- + if (of_node == other->dev.of_node) {
- + mtd = other;
- + break;
- + }
- + }
- +
- + if (!mtd)
- + goto out_unlock;
- +
- + err = __get_mtd_device(mtd);
- + if (err)
- + goto out_unlock;
- +
- + mutex_unlock(&mtd_table_mutex);
- + return mtd;
- +
- +out_unlock:
- + mutex_unlock(&mtd_table_mutex);
- + return ERR_PTR(err);
- +}
- +EXPORT_SYMBOL_GPL(get_mtd_device_by_node);
- +
- void put_mtd_device(struct mtd_info *mtd)
- {
- mutex_lock(&mtd_table_mutex);
- --- a/include/linux/mtd/mtd.h
- +++ b/include/linux/mtd/mtd.h
- @@ -580,6 +580,8 @@ extern struct mtd_info *get_mtd_device(s
- extern int __get_mtd_device(struct mtd_info *mtd);
- extern void __put_mtd_device(struct mtd_info *mtd);
- extern struct mtd_info *get_mtd_device_nm(const char *name);
- +extern struct mtd_info *get_mtd_device_by_node(
- + const struct device_node *of_node);
- extern void put_mtd_device(struct mtd_info *mtd);
-
-
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