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mtd: nand: Provide nand_cleanup() function to free NAND related resources

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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@nod.at>
Signed-off-by: Daniel Walter <dwalter@sigma-star.at>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Richard Weinberger 2016-09-21 11:44:41 +02:00 committed by Boris Brezillon
parent a9843193ce
commit d44154f969
2 changed files with 19 additions and 8 deletions
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22
drivers/mtd/nand/nand_base.c
View File

@ -4799,19 +4799,15 @@ int nand_scan(struct mtd_info *mtd, int maxchips)
EXPORT_SYMBOL(nand_scan); EXPORT_SYMBOL(nand_scan);
/** /**
* nand_release - [NAND Interface] Free resources held by the NAND device * nand_cleanup - [NAND Interface] Free resources held by the NAND device
* @mtd: MTD device structure * @chip: NAND chip object
*/ */
void nand_release(struct mtd_info *mtd) void nand_cleanup(struct nand_chip *chip)
{ {
struct nand_chip *chip = mtd_to_nand(mtd);
if (chip->ecc.mode == NAND_ECC_SOFT && if (chip->ecc.mode == NAND_ECC_SOFT &&
chip->ecc.algo == NAND_ECC_BCH) chip->ecc.algo == NAND_ECC_BCH)
nand_bch_free((struct nand_bch_control *)chip->ecc.priv); nand_bch_free((struct nand_bch_control *)chip->ecc.priv);
mtd_device_unregister(mtd);
nand_release_data_interface(chip); nand_release_data_interface(chip);
/* Free bad block table memory */ /* Free bad block table memory */
@ -4824,6 +4820,18 @@ void nand_release(struct mtd_info *mtd)
& NAND_BBT_DYNAMICSTRUCT) & NAND_BBT_DYNAMICSTRUCT)
kfree(chip->badblock_pattern); 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_to_nand(mtd));
}
EXPORT_SYMBOL_GPL(nand_release); EXPORT_SYMBOL_GPL(nand_release);
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");

5
include/linux/mtd/nand.h
View File

@ -38,7 +38,7 @@ int nand_scan_ident(struct mtd_info *mtd, int max_chips,
struct nand_flash_dev *table); struct nand_flash_dev *table);
int nand_scan_tail(struct mtd_info *mtd); 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 */
void nand_release(struct mtd_info *mtd); void nand_release(struct mtd_info *mtd);
/* Internal helper for board drivers which need to override command function */ /* Internal helper for board drivers which need to override command function */
@ -1186,4 +1186,7 @@ int nand_read_oob_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
/* Reset and initialize a NAND device */ /* Reset and initialize a NAND device */
int nand_reset(struct nand_chip *chip); int nand_reset(struct nand_chip *chip);
/* Free resources held by the NAND device */
void nand_cleanup(struct nand_chip *chip);
#endif /* __LINUX_MTD_NAND_H */ #endif /* __LINUX_MTD_NAND_H */