diff options
| author | Paul Parsons <lost.distance@yahoo.com> | 2012-03-07 14:12:50 +0000 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2012-03-27 00:52:49 +0100 |
| commit | 5fbabf3f45a15c2b39170980cee01368138f4d79 (patch) | |
| tree | 486eea6db78490042d4f6d0f6eb7bd8e834e2598 | |
| parent | 876fe76d793d03077eb61ba3afab4a383f46c554 (diff) | |
| download | linux-5fbabf3f45a15c2b39170980cee01368138f4d79.tar.bz2 | |
mtd: maps: l440gx: Add reference counter to set_vpp()
This patch is part of a set which fixes unnecessary flash erase and write errors
resulting from the MTD CFI driver turning off vpp while an erase is in progress.
This patch allows l440gx_set_vpp() calls to be nested by adding a reference
counter.
Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| -rw-r--r-- | drivers/mtd/maps/l440gx.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/mtd/maps/l440gx.c b/drivers/mtd/maps/l440gx.c index dd0360ba2412..74bd98ee635f 100644 --- a/drivers/mtd/maps/l440gx.c +++ b/drivers/mtd/maps/l440gx.c @@ -27,17 +27,21 @@ static struct mtd_info *mymtd; /* Is this really the vpp port? */ +static DEFINE_SPINLOCK(l440gx_vpp_lock); +static int l440gx_vpp_refcnt; static void l440gx_set_vpp(struct map_info *map, int vpp) { - unsigned long l; + unsigned long flags; - l = inl(VPP_PORT); + spin_lock_irqsave(&l440gx_vpp_lock, flags); if (vpp) { - l |= 1; + if (++l440gx_vpp_refcnt == 1) /* first nested 'on' */ + outl(inl(VPP_PORT) | 1, VPP_PORT); } else { - l &= ~1; + if (--l440gx_vpp_refcnt == 0) /* last nested 'off' */ + outl(inl(VPP_PORT) & ~1, VPP_PORT); } - outl(l, VPP_PORT); + spin_unlock_irqrestore(&l440gx_vpp_lock, flags); } static struct map_info l440gx_map = { |