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mtd: maps: sa1100-flash: 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 sa1100_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>
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1 changed files with 13 additions and 1 deletions
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@ -36,10 +36,22 @@ struct sa_info {
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struct sa_subdev_info subdev[0];
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};
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static DEFINE_SPINLOCK(sa1100_vpp_lock);
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static int sa1100_vpp_refcnt;
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static void sa1100_set_vpp(struct map_info *map, int on)
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{
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struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map);
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subdev->plat->set_vpp(on);
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unsigned long flags;
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spin_lock_irqsave(&sa1100_vpp_lock, flags);
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if (on) {
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if (++sa1100_vpp_refcnt == 1) /* first nested 'on' */
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subdev->plat->set_vpp(1);
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} else {
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if (--sa1100_vpp_refcnt == 0) /* last nested 'off' */
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subdev->plat->set_vpp(0);
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}
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spin_unlock_irqrestore(&sa1100_vpp_lock, flags);
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}
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static void sa1100_destroy_subdev(struct sa_subdev_info *subdev)
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