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mtd: fix hang-up in cfi erase and read contention

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cfi erase command hangs up when erase and read contention occurs.
If read runs at the same address as erase operation, read issues
Erase-Suspend via get_chip() and the erase goes into sleep in wait queue.
But in this case, read operation exits by time-out without waking it up.

I think the other variants (0001, 0020 and lpddr) have the same problem too.
Tested and verified the patch only on CFI-0002 flash, though.

Signed-off-by: Tadashi Abe <tabe@mvista.com>
Acked-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Tadashi Abe 2011-05-19 15:58:15 +09:00 committed by David Woodhouse
parent 52534f2dba
commit 100f2341e3
4 changed files with 6 additions and 15 deletions
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9
drivers/mtd/chips/cfi_cmdset_0001.c
View file

@ -812,12 +812,9 @@ static int chip_ready (struct map_info *map, struct flchip *chip, unsigned long
break;
if (time_after(jiffies, timeo)) {
/* Urgh. Resume and pretend we weren't here. */
map_write(map, CMD(0xd0), adr);
/* Make sure we're in 'read status' mode if it had finished */
map_write(map, CMD(0x70), adr);
chip->state = FL_ERASING;
chip->oldstate = FL_READY;
/* Urgh. Resume and pretend we weren't here.
* Make sure we're in 'read status' mode if it had finished */
put_chip(map, chip, adr);
printk(KERN_ERR "%s: Chip not ready after erase "
"suspended: status = 0x%lx\n", map->name, status.x[0]);
return -EIO;

4
drivers/mtd/chips/cfi_cmdset_0002.c
View file

@ -711,9 +711,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
* there was an error (so leave the erase
* routine to recover from it) or we trying to
* use the erase-in-progress sector. */
map_write(map, cfi->sector_erase_cmd, chip->in_progress_block_addr);
chip->state = FL_ERASING;
chip->oldstate = FL_READY;
put_chip(map, chip, adr);
printk(KERN_ERR "MTD %s(): chip not ready after erase suspend\n", __func__);
return -EIO;
}

1
drivers/mtd/chips/cfi_cmdset_0020.c
View file

@ -296,6 +296,7 @@ static inline int do_read_onechip(struct map_info *map, struct flchip *chip, lof
/* make sure we're in 'read status' mode */
map_write(map, CMD(0x70), cmd_addr);
chip->state = FL_ERASING;
wake_up(&chip->wq);
mutex_unlock(&chip->mutex);
printk(KERN_ERR "Chip not ready after erase "
"suspended: status = 0x%lx\n", status.x[0]);

7
drivers/mtd/lpddr/lpddr_cmds.c
View file

@ -313,12 +313,7 @@ static int chip_ready(struct map_info *map, struct flchip *chip, int mode)
if (ret) {
/* Oops. something got wrong. */
/* Resume and pretend we weren't here. */
map_write(map, CMD(LPDDR_RESUME),
map->pfow_base + PFOW_COMMAND_CODE);
map_write(map, CMD(LPDDR_START_EXECUTION),
map->pfow_base + PFOW_COMMAND_EXECUTE);
chip->state = FL_ERASING;
chip->oldstate = FL_READY;
put_chip(map, chip);
printk(KERN_ERR "%s: suspend operation failed."
"State may be wrong \n", map->name);
return -EIO;