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authorStephen Warren <swarren@nvidia.com>2012-04-05 01:48:28 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-04-06 13:47:34 +0400
commitbacdbe077342ecc9e7b3e374cc5a41995116706a (patch)
treeb5cf9547a0ab4a7fba287a3d654d132869057afa /drivers/base/regmap/regcache-rbtree.c
parent0135bbcc7a0cc056f0203ff839466236b8e3dc19 (diff)
downloadlinux-bacdbe077342ecc9e7b3e374cc5a41995116706a.tar.xz
regmap: introduce fast_io busses, and use a spinlock for them
Some bus types have very fast IO. For these, acquiring a mutex for every IO operation is a significant overhead. Allow busses to indicate their IO is fast, and enhance regmap to use a spinlock for those busses. [Currently limited to native endian registers -- broonie] Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/base/regmap/regcache-rbtree.c')
-rw-r--r--drivers/base/regmap/regcache-rbtree.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 5157fa04c2f0..cca46007d969 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -139,7 +139,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
int nodes = 0;
int registers = 0;
- mutex_lock(&map->lock);
+ map->lock(map);
for (node = rb_first(&rbtree_ctx->root); node != NULL;
node = rb_next(node)) {
@@ -155,7 +155,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
seq_printf(s, "%d nodes, %d registers, average %d registers\n",
nodes, registers, registers / nodes);
- mutex_unlock(&map->lock);
+ map->unlock(map);
return 0;
}