From: Marek Behún marek.behun@nic.cz
The original purpose of mtd_erase_callback() in Linux at the time it was imported to U-Boot, was to inform the caller that erasing is done (since it was an asynchronous operation).
All supplied callback methods in U-Boot do nothing, but the mtd_erase_callback() function was (until previous patch) grossly abused in U-Boot's mtdpart implementation for completely different purpose.
Since we got rid of the abusement, remove the mtd_erase_callback() function and the .callback member from struct erase_info entirely, in order to avoid such problems in the future.
Signed-off-by: Marek Behún marek.behun@nic.cz --- cmd/onenand.c | 9 ++------- drivers/mtd/altera_qspi.c | 3 --- drivers/mtd/cfi_mtd.c | 1 - drivers/mtd/mtdconcat.c | 11 ----------- drivers/mtd/mtdcore.c | 8 -------- drivers/mtd/mtdpart.c | 21 --------------------- drivers/mtd/nand/raw/nand_base.c | 4 ---- drivers/mtd/onenand/onenand_base.c | 3 --- drivers/mtd/spi/sf_mtd.c | 1 - drivers/mtd/spi/spi-nor-core.c | 5 ++--- drivers/mtd/ubi/io.c | 13 ------------- env/onenand.c | 4 +--- fs/yaffs2/yaffs_mtdif.c | 1 - include/linux/mtd/mtd.h | 11 ----------- include/nand.h | 1 - 15 files changed, 5 insertions(+), 91 deletions(-)
diff --git a/cmd/onenand.c b/cmd/onenand.c index 852ed5c7b2..592985a7ee 100644 --- a/cmd/onenand.c +++ b/cmd/onenand.c @@ -186,9 +186,7 @@ next: static int onenand_block_erase(u32 start, u32 size, int force) { struct onenand_chip *this = mtd->priv; - struct erase_info instr = { - .callback = NULL, - }; + struct erase_info instr = {}; loff_t ofs; int ret; int blocksize = 1 << this->erase_shift; @@ -219,10 +217,7 @@ static int onenand_block_erase(u32 start, u32 size, int force) static int onenand_block_test(u32 start, u32 size) { struct onenand_chip *this = mtd->priv; - struct erase_info instr = { - .callback = NULL, - .priv = 0, - }; + struct erase_info instr = {};
int blocks; loff_t ofs; diff --git a/drivers/mtd/altera_qspi.c b/drivers/mtd/altera_qspi.c index 7bac599a54..d31391f36a 100644 --- a/drivers/mtd/altera_qspi.c +++ b/drivers/mtd/altera_qspi.c @@ -153,7 +153,6 @@ static int altera_qspi_erase(struct mtd_info *mtd, struct erase_info *instr) putc('\n'); instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; instr->state = MTD_ERASE_FAILED; - mtd_erase_callback(instr); return -EIO; } flash = pdata->base + addr; @@ -177,7 +176,6 @@ static int altera_qspi_erase(struct mtd_info *mtd, struct erase_info *instr) writel(stat, ®s->isr); /* clear isr */ instr->fail_addr = addr; instr->state = MTD_ERASE_FAILED; - mtd_erase_callback(instr); return -EIO; } if (flash_verbose) @@ -189,7 +187,6 @@ static int altera_qspi_erase(struct mtd_info *mtd, struct erase_info *instr) addr += mtd->erasesize; } instr->state = MTD_ERASE_DONE; - mtd_erase_callback(instr);
return 0; } diff --git a/drivers/mtd/cfi_mtd.c b/drivers/mtd/cfi_mtd.c index 78293caa2f..2295bb7220 100644 --- a/drivers/mtd/cfi_mtd.c +++ b/drivers/mtd/cfi_mtd.c @@ -58,7 +58,6 @@ static int cfi_mtd_erase(struct mtd_info *mtd, struct erase_info *instr) }
instr->state = MTD_ERASE_DONE; - mtd_erase_callback(instr); return 0; }
diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c index 684bc94998..af3c4765c4 100644 --- a/drivers/mtd/mtdconcat.c +++ b/drivers/mtd/mtdconcat.c @@ -338,14 +338,6 @@ concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) return -EINVAL; }
-static void concat_erase_callback(struct erase_info *instr) -{ - /* Nothing to do here in U-Boot */ -#ifndef __UBOOT__ - wake_up((wait_queue_head_t *) instr->priv); -#endif -} - static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase) { int err; @@ -358,7 +350,6 @@ static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase) init_waitqueue_head(&waitq);
erase->mtd = mtd; - erase->callback = concat_erase_callback; erase->priv = (unsigned long) &waitq;
/* @@ -498,8 +489,6 @@ static int concat_erase(struct mtd_info *mtd, struct erase_info *instr) if (err) return err;
- if (instr->callback) - instr->callback(instr); return 0; }
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 582129d0df..37c5b6386e 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -906,13 +906,6 @@ void __put_mtd_device(struct mtd_info *mtd) } EXPORT_SYMBOL_GPL(__put_mtd_device);
-/* - * Erase is an asynchronous operation. Device drivers are supposed - * to call instr->callback() whenever the operation completes, even - * if it completes with a failure. - * Callers are supposed to pass a callback function and wait for it - * to be called before writing to the block. - */ int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) { if (instr->addr > mtd->size || instr->len > mtd->size - instr->addr) @@ -922,7 +915,6 @@ int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; if (!instr->len) { instr->state = MTD_ERASE_DONE; - mtd_erase_callback(instr); return 0; } return mtd->_erase(mtd, instr); diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index 6ab481a7b1..a435ce6d07 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -456,27 +456,6 @@ static int part_erase(struct mtd_info *mtd, struct erase_info *instr) return ret; }
-void mtd_erase_callback(struct erase_info *instr) -{ - if (!instr->callback) - return; - - if (instr->mtd->_erase == part_erase && instr->len) { - if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) - instr->fail_addr -= instr->mtd->offset; - instr->addr -= instr->mtd->offset; - } - - instr->callback(instr); - - if (instr->mtd->_erase == part_erase && instr->len) { - if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) - instr->fail_addr += instr->mtd->offset; - instr->addr += instr->mtd->offset; - } -} -EXPORT_SYMBOL_GPL(mtd_erase_callback); - static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { return mtd->parent->_lock(mtd->parent, ofs + mtd->offset, len); diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c index 3679ee727e..b3dcaf0704 100644 --- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -3605,10 +3605,6 @@ erase_exit: chip->select_chip(mtd, -1); nand_release_device(mtd);
- /* Do call back function */ - if (!ret) - mtd_erase_callback(instr); - /* Return more or less happy */ return ret; } diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c index 09daa0dd36..bb93a9a1e9 100644 --- a/drivers/mtd/onenand/onenand_base.c +++ b/drivers/mtd/onenand/onenand_base.c @@ -1836,9 +1836,6 @@ int onenand_erase(struct mtd_info *mtd, struct erase_info *instr) erase_exit:
ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO; - /* Do call back function */ - if (!ret) - mtd_erase_callback(instr);
/* Deselect and wake up anyone waiting on the device */ onenand_release_device(mtd); diff --git a/drivers/mtd/spi/sf_mtd.c b/drivers/mtd/spi/sf_mtd.c index 04de868080..0aed28a52b 100644 --- a/drivers/mtd/spi/sf_mtd.c +++ b/drivers/mtd/spi/sf_mtd.c @@ -46,7 +46,6 @@ static int spi_flash_mtd_erase(struct mtd_info *mtd, struct erase_info *instr) }
instr->state = MTD_ERASE_DONE; - mtd_erase_callback(instr);
return 0; } diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c index 124594f0cd..822bd63b92 100644 --- a/drivers/mtd/spi/spi-nor-core.c +++ b/drivers/mtd/spi/spi-nor-core.c @@ -916,7 +916,7 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr) div_u64_rem(instr->len, mtd->erasesize, &rem); if (rem) { ret = -EINVAL; - goto erase_err_callback; + goto err; }
addr = instr->addr; @@ -964,14 +964,13 @@ erase_err: if (!ret) ret = err;
-erase_err_callback: +err: if (ret) { instr->fail_addr = addr_known ? addr : MTD_FAIL_ADDR_UNKNOWN; instr->state = MTD_ERASE_FAILED; } else { instr->state = MTD_ERASE_DONE; } - mtd_erase_callback(instr);
return ret; } diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c index b8b878b918..14be95b74b 100644 --- a/drivers/mtd/ubi/io.c +++ b/drivers/mtd/ubi/io.c @@ -304,18 +304,6 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset, return err; }
-/** - * erase_callback - MTD erasure call-back. - * @ei: MTD erase information object. - * - * Note, even though MTD erase interface is asynchronous, all the current - * implementations are synchronous anyway. - */ -static void erase_callback(struct erase_info *ei) -{ - wake_up_interruptible((wait_queue_head_t *)ei->priv); -} - /** * do_sync_erase - synchronously erase a physical eraseblock. * @ubi: UBI device description object @@ -346,7 +334,6 @@ retry: ei.mtd = ubi->mtd; ei.addr = (loff_t)pnum * ubi->peb_size; ei.len = ubi->peb_size; - ei.callback = erase_callback; ei.priv = (unsigned long)&wq;
err = mtd_erase(ubi->mtd, &ei); diff --git a/env/onenand.c b/env/onenand.c index c8da3ff811..1faa2cb62a 100644 --- a/env/onenand.c +++ b/env/onenand.c @@ -73,9 +73,7 @@ static int env_onenand_save(void) #endif loff_t env_addr = CONFIG_ENV_ADDR; size_t retlen; - struct erase_info instr = { - .callback = NULL, - }; + struct erase_info instr = {};
ret = env_export(&env_new); if (ret) diff --git a/fs/yaffs2/yaffs_mtdif.c b/fs/yaffs2/yaffs_mtdif.c index d338f9aa91..50fed2d4b1 100644 --- a/fs/yaffs2/yaffs_mtdif.c +++ b/fs/yaffs2/yaffs_mtdif.c @@ -145,7 +145,6 @@ int nandmtd_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber) ei.len = dev->data_bytes_per_chunk * dev->param.chunks_per_block; ei.time = 1000; ei.retries = 2; - ei.callback = NULL; ei.priv = (u_long) dev;
/* Todo finish off the ei if required */ diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 3b302fb8c3..7455400981 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -51,7 +51,6 @@ struct erase_info { u_long retries; unsigned dev; unsigned cell; - void (*callback) (struct erase_info *self); u_long priv; u_char state; struct erase_info *next; @@ -535,16 +534,6 @@ extern int unregister_mtd_user (struct mtd_notifier *old); #endif void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
-#ifdef CONFIG_MTD_PARTITIONS -void mtd_erase_callback(struct erase_info *instr); -#else -static inline void mtd_erase_callback(struct erase_info *instr) -{ - if (instr->callback) - instr->callback(instr); -} -#endif - static inline int mtd_is_bitflip(int err) { return err == -EUCLEAN; } diff --git a/include/nand.h b/include/nand.h index 80dd6469bc..efe193078b 100644 --- a/include/nand.h +++ b/include/nand.h @@ -68,7 +68,6 @@ static inline int nand_erase(struct mtd_info *info, loff_t off, size_t size) instr.mtd = info; instr.addr = off; instr.len = size; - instr.callback = 0;
return mtd_erase(info, &instr); }