diff options
| author | Tadashi Abe <tabe@mvista.com> | 2011-05-19 15:58:15 +0900 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2011-05-25 02:11:11 +0100 |
| commit | 100f2341e305f98de3aa12fb472771ab029cbda7 (patch) | |
| tree | 40cc6edf73cf06b6392a18fd496cb9dc071c98d4 /drivers/mtd/chips | |
| parent | 52534f2dba5d033c0c33e515faa2767d7e8e986a (diff) | |
| download | linux-3.10-100f2341e305f98de3aa12fb472771ab029cbda7.tar.gz linux-3.10-100f2341e305f98de3aa12fb472771ab029cbda7.tar.bz2 linux-3.10-100f2341e305f98de3aa12fb472771ab029cbda7.zip | |
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/chips')
| -rw-r--r-- | drivers/mtd/chips/cfi_cmdset_0001.c | 9 | ||||
| -rw-r--r-- | drivers/mtd/chips/cfi_cmdset_0002.c | 4 | ||||
| -rw-r--r-- | drivers/mtd/chips/cfi_cmdset_0020.c | 1 |
3 files changed, 5 insertions, 9 deletions
diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_cmdset_0001.c index 09cb7c8d93b..121be022d1e 100644 --- a/drivers/mtd/chips/cfi_cmdset_0001.c +++ b/drivers/mtd/chips/cfi_cmdset_0001.c @@ -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; diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c index b890f6c964d..9a99a5bd3ea 100644 --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -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; } diff --git a/drivers/mtd/chips/cfi_cmdset_0020.c b/drivers/mtd/chips/cfi_cmdset_0020.c index ed56ad3884f..179814a95f3 100644 --- a/drivers/mtd/chips/cfi_cmdset_0020.c +++ b/drivers/mtd/chips/cfi_cmdset_0020.c @@ -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]); |