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path: root/drivers/mtd/maps
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Diffstat (limited to 'drivers/mtd/maps')
-rw-r--r--drivers/mtd/maps/physmap.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/mtd/maps/physmap.c b/drivers/mtd/maps/physmap.c
index abc562653b31..7e9233c503ab 100644
--- a/drivers/mtd/maps/physmap.c
+++ b/drivers/mtd/maps/physmap.c
@@ -27,6 +27,8 @@ struct physmap_flash_info {
struct mtd_info *mtd[MAX_RESOURCES];
struct mtd_info *cmtd;
struct map_info map[MAX_RESOURCES];
+ spinlock_t vpp_lock;
+ int vpp_refcnt;
};
static int physmap_flash_remove(struct platform_device *dev)
@@ -63,12 +65,26 @@ static void physmap_set_vpp(struct map_info *map, int state)
{
struct platform_device *pdev;
struct physmap_flash_data *physmap_data;
+ struct physmap_flash_info *info;
+ unsigned long flags;
pdev = (struct platform_device *)map->map_priv_1;
physmap_data = pdev->dev.platform_data;
- if (physmap_data->set_vpp)
- physmap_data->set_vpp(pdev, state);
+ if (!physmap_data->set_vpp)
+ return;
+
+ info = platform_get_drvdata(pdev);
+
+ spin_lock_irqsave(&info->vpp_lock, flags);
+ if (state) {
+ if (++info->vpp_refcnt == 1) /* first nested 'on' */
+ physmap_data->set_vpp(pdev, 1);
+ } else {
+ if (--info->vpp_refcnt == 0) /* last nested 'off' */
+ physmap_data->set_vpp(pdev, 0);
+ }
+ spin_unlock_irqrestore(&info->vpp_lock, flags);
}
static const char *rom_probe_types[] = {
@@ -172,6 +188,8 @@ static int physmap_flash_probe(struct platform_device *dev)
if (err)
goto err_out;
+ spin_lock_init(&info->vpp_lock);
+
part_types = physmap_data->part_probe_types ? : part_probe_types;
mtd_device_parse_register(info->cmtd, part_types, 0,