diff options
Diffstat (limited to 'drivers/mtd/maps/pcmciamtd.c')
| -rw-r--r-- | drivers/mtd/maps/pcmciamtd.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/mtd/maps/pcmciamtd.c b/drivers/mtd/maps/pcmciamtd.c index 0259cf583022..a3cfad392ed6 100644 --- a/drivers/mtd/maps/pcmciamtd.c +++ b/drivers/mtd/maps/pcmciamtd.c @@ -294,13 +294,24 @@ static void pcmcia_copy_to(struct map_info *map, unsigned long to, const void *f } +static DEFINE_SPINLOCK(pcmcia_vpp_lock); +static int pcmcia_vpp_refcnt; static void pcmciamtd_set_vpp(struct map_info *map, int on) { struct pcmciamtd_dev *dev = (struct pcmciamtd_dev *)map->map_priv_1; struct pcmcia_device *link = dev->p_dev; + unsigned long flags; pr_debug("dev = %p on = %d vpp = %d\n\n", dev, on, dev->vpp); - pcmcia_fixup_vpp(link, on ? dev->vpp : 0); + spin_lock_irqsave(&pcmcia_vpp_lock, flags); + if (on) { + if (++pcmcia_vpp_refcnt == 1) /* first nested 'on' */ + pcmcia_fixup_vpp(link, dev->vpp); + } else { + if (--pcmcia_vpp_refcnt == 0) /* last nested 'off' */ + pcmcia_fixup_vpp(link, 0); + } + spin_unlock_irqrestore(&pcmcia_vpp_lock, flags); } |