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| author | Paul Parsons <lost.distance@yahoo.com> | 2012-03-07 14:12:08 +0000 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2012-03-27 00:52:28 +0100 |
| commit | 876fe76d793d03077eb61ba3afab4a383f46c554 (patch) | |
| tree | fb7d98bd746ebd1c3c5919f10a998e8f2dbd9e8b /drivers/mtd/maps | |
| parent | e7d9377e0440c25805dcc5b0af189a87beb69f5e (diff) | |
| download | linux-stable-876fe76d793d03077eb61ba3afab4a383f46c554.tar.gz linux-stable-876fe76d793d03077eb61ba3afab4a383f46c554.tar.bz2 linux-stable-876fe76d793d03077eb61ba3afab4a383f46c554.zip | |
mtd: maps: physmap: 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 physmap_set_vpp() calls to be nested by adding a reference
counter.
omap1_set_vpp() already used a reference counter. Since it is called from
physmap_set_vpp(), omap1_set_vpp() can now be simplified.
simtec_nor_vpp() already disabled hard interrupts. Since it is called from
physmap_set_vpp(), simtec_nor_vpp() can now be simplified.
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>
Diffstat (limited to 'drivers/mtd/maps')
| -rw-r--r-- | drivers/mtd/maps/physmap.c | 22 |
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, |