[PATCH 4.4 30/39] mtd: nand: Provide nand_cleanup() function to free NAND related resources

[Greg Kroah-Hartman]

From: Richard Weinberger <richard@xxxxxx>

[ Upstream commit d44154f969a44269a9288c274c1c2fd9e85df8a5 ]

Provide a nand_cleanup() function to free all nand related resources
without unregistering the mtd device.
This should allow drivers to call mtd_device_unregister() and handle
its return value and still being able to cleanup all nand related
resources.

Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Daniel Walter <dwalter@xxxxxxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/mtd/nand/nand_base.c | 22 +++++++++++++++-------
 include/linux/mtd/nand.h     |  6 +++++-
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 8406f346b0be5..09864226428b2 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4427,18 +4427,14 @@ int nand_scan(struct mtd_info *mtd, int maxchips)
 EXPORT_SYMBOL(nand_scan);
 
 /**
- * nand_release - [NAND Interface] Free resources held by the NAND device
- * @mtd: MTD device structure
+ * nand_cleanup - [NAND Interface] Free resources held by the NAND device
+ * @chip: NAND chip object
  */
-void nand_release(struct mtd_info *mtd)
+void nand_cleanup(struct nand_chip *chip)
 {
-	struct nand_chip *chip = mtd->priv;
-
 	if (chip->ecc.mode == NAND_ECC_SOFT_BCH)
 		nand_bch_free((struct nand_bch_control *)chip->ecc.priv);
 
-	mtd_device_unregister(mtd);
-
 	/* Free bad block table memory */
 	kfree(chip->bbt);
 	if (!(chip->options & NAND_OWN_BUFFERS))
@@ -4449,6 +4445,18 @@ void nand_release(struct mtd_info *mtd)
 			& NAND_BBT_DYNAMICSTRUCT)
 		kfree(chip->badblock_pattern);
 }
+EXPORT_SYMBOL_GPL(nand_cleanup);
+
+/**
+ * nand_release - [NAND Interface] Unregister the MTD device and free resources
+ *		  held by the NAND device
+ * @mtd: MTD device structure
+ */
+void nand_release(struct mtd_info *mtd)
+{
+	mtd_device_unregister(mtd);
+	nand_cleanup(mtd->priv);
+}
 EXPORT_SYMBOL_GPL(nand_release);
 
 static int __init nand_base_init(void)
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 93fc372007937..1a066faf7b801 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -38,7 +38,7 @@ extern int nand_scan_ident(struct mtd_info *mtd, int max_chips,
 			   struct nand_flash_dev *table);
 extern int nand_scan_tail(struct mtd_info *mtd);
 
-/* Free resources held by the NAND device */
+/* Unregister the MTD device and free resources held by the NAND device */
 extern void nand_release(struct mtd_info *mtd);
 
 /* Internal helper for board drivers which need to override command function */
@@ -1029,4 +1029,8 @@ int nand_check_erased_ecc_chunk(void *data, int datalen,
 				void *ecc, int ecclen,
 				void *extraoob, int extraooblen,
 				int threshold);
+
+/* Free resources held by the NAND device */
+void nand_cleanup(struct nand_chip *chip);
+
 #endif /* __LINUX_MTD_NAND_H */
-- 
2.25.1