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[MTD] [NOR] Prevent erase command invocation on suspended chip 

while running stress tests we have met cfi_cmdset_0001.c driver issue.
Working on multipartitional devices with erase suspend on write
feature enabled it is possible to get erase operation invoked on chip
with suspended erase. get_chip() looses information about earlier
suspended erase and new erase operation gets issued. New erase
operations report successful completion, but blocks remain dirty
causing, for example, JFFS2 error messages like:

...
Newly-erased block contained word 0x20031985 at offset 0x00200000
Newly-erased block contained word 0x20031985 at offset 0x00280000
Newly-erased block contained word 0x20031985 at offset 0x00240000
...

The patch below fixes that issue.

Signed-off-by: Alexander Belyakov <alexander.belyakov@intel.com>
Acked-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Alexander Belyakov 2007-11-07 11:58:07 +03:00 committed by David Woodhouse
parent 5f4d47d5d1
commit 6c24e4161e
1 changed files with 15 additions and 0 deletions
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15
drivers/mtd/chips/cfi_cmdset_0001.c
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@ -795,6 +795,7 @@ static int chip_ready (struct map_info *map, struct flchip *chip, unsigned long
static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode)
{
int ret;
DECLARE_WAITQUEUE(wait, current);
retry:
if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING
@ -851,6 +852,20 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
spin_unlock(contender->mutex);
}
/* Check if we already have suspended erase
* on this chip. Sleep. */
if (mode == FL_ERASING && shared->erasing
&& shared->erasing->oldstate == FL_ERASING) {
spin_unlock(&shared->lock);
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
spin_unlock(chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
spin_lock(chip->mutex);
goto retry;
}
/* We now own it */
shared->writing = chip;
if (mode == FL_ERASING)