diff options
Diffstat (limited to 'nixos/modules/kernel-patches/0054-mtd-core-add-get_mtd_device_by_node.patch')
| -rw-r--r-- | nixos/modules/kernel-patches/0054-mtd-core-add-get_mtd_device_by_node.patch | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/nixos/modules/kernel-patches/0054-mtd-core-add-get_mtd_device_by_node.patch b/nixos/modules/kernel-patches/0054-mtd-core-add-get_mtd_device_by_node.patch new file mode 100644 index 0000000..6a57d72 --- /dev/null +++ b/nixos/modules/kernel-patches/0054-mtd-core-add-get_mtd_device_by_node.patch @@ -0,0 +1,82 @@ +From 1065fc1f12c66020a9e49a9951a7ba39112bf405 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 54/96] 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(+) + +diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c +index ccb80197d960..c8f8da3f3736 100644 +--- a/drivers/mtd/mtdcore.c ++++ b/drivers/mtd/mtdcore.c +@@ -1202,6 +1202,44 @@ struct mtd_info *get_mtd_device_nm(const char *name) + } + 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); +diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h +index cd7807a23123..3ec4f745f1b4 100644 +--- a/include/linux/mtd/mtd.h ++++ b/include/linux/mtd/mtd.h +@@ -698,6 +698,8 @@ extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); + 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); + + static inline uint64_t mtdpart_get_offset(const struct mtd_info *mtd) +-- +2.37.2 + |