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authorTadashi Abe <tabe@mvista.com>2011-05-19 15:58:15 +0900
committerDavid Woodhouse <David.Woodhouse@intel.com>2011-05-25 02:11:11 +0100
commit100f2341e305f98de3aa12fb472771ab029cbda7 (patch)
tree40cc6edf73cf06b6392a18fd496cb9dc071c98d4 /drivers/mtd/lpddr
parent52534f2dba5d033c0c33e515faa2767d7e8e986a (diff)
downloadlinux-100f2341e305f98de3aa12fb472771ab029cbda7.tar.bz2
mtd: fix hang-up in cfi erase and read contention
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>
Diffstat (limited to 'drivers/mtd/lpddr')
-rw-r--r--drivers/mtd/lpddr/lpddr_cmds.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/drivers/mtd/lpddr/lpddr_cmds.c b/drivers/mtd/lpddr/lpddr_cmds.c
index 12679925b420..16dcd1c76baf 100644
--- a/drivers/mtd/lpddr/lpddr_cmds.c
+++ b/drivers/mtd/lpddr/lpddr_cmds.c
@@ -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;