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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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7
drivers/mtd/lpddr/lpddr_cmds.c
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@@ -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;