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[MTD] [NOR] fix cfi_cmdset_0001 FL_SYNCING race (take 2)

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The patch fixes CFI issue with multipartitional devices leading to the 
set of errors or even deadlock. The problem is CFI FL_SYNCING state race 
with flash operations (e.g. erase suspend). It is reproduced by running 
intensive writes on one JFFS2 partition and simultaneously performing 
mount/unmount cycle on another partition of the same chip.

Signed-off-by: Alexander Belyakov <abelyako@googlemail.com>
Acked-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Alexander Belyakov 2008-09-25 17:53:24 +04:00 committed by David Woodhouse
parent ef89a88013
commit 3afe7eb37f
1 changed files with 15 additions and 2 deletions
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17
drivers/mtd/chips/cfi_cmdset_0001.c
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@ -725,6 +725,10 @@ static int chip_ready (struct map_info *map, struct flchip *chip, unsigned long
struct cfi_pri_intelext *cfip = cfi->cmdset_priv;
unsigned long timeo = jiffies + HZ;
/* Prevent setting state FL_SYNCING for chip in suspended state. */
if (mode == FL_SYNCING && chip->oldstate != FL_READY)
goto sleep;
switch (chip->state) {
case FL_STATUS:
@ -830,8 +834,9 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
DECLARE_WAITQUEUE(wait, current);
retry:
if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING
|| mode == FL_OTP_WRITE || mode == FL_SHUTDOWN)) {
if (chip->priv &&
(mode == FL_WRITING || mode == FL_ERASING || mode == FL_OTP_WRITE
|| mode == FL_SHUTDOWN) && chip->state != FL_SYNCING) {
/*
* OK. We have possibility for contention on the write/erase
* operations which are global to the real chip and not per
@ -881,6 +886,14 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
return ret;
}
spin_lock(&shared->lock);
/* We should not own chip if it is already
* in FL_SYNCING state. Put contender and retry. */
if (chip->state == FL_SYNCING) {
put_chip(map, contender, contender->start);
spin_unlock(contender->mutex);
goto retry;
}
spin_unlock(contender->mutex);
}