diff options
author | Mike Turquette <mturquette@linaro.org> | 2012-03-29 14:30:40 -0700 |
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committer | Mike Turquette <mturquette@linaro.org> | 2012-04-24 16:37:39 -0700 |
commit | d1302a36a7f1c33d1a8babc6a510e1401a5e5aed (patch) | |
tree | bcb0d5f659a762764b75720fdada09ac9c548886 /drivers/clk | |
parent | d305fb78f31209596c9135d396a0d3af7ac86947 (diff) | |
download | linux-d1302a36a7f1c33d1a8babc6a510e1401a5e5aed.tar.bz2 |
clk: core: copy parent_names & return error codes
This patch cleans up clk_register and solves a few bugs by teaching
clk_register and __clk_init to return error codes (instead of just NULL)
to better align with the existing clk.h api.
Along with that change this patch also introduces a new behavior whereby
clk_register copies the parent_names array, thus allowing platforms to
declare their parent_names arrays as __initdata.
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk')
-rw-r--r-- | drivers/clk/clk.c | 65 |
1 files changed, 53 insertions, 12 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index ddade8759ea9..8f7c3849c8f6 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1185,34 +1185,41 @@ EXPORT_SYMBOL_GPL(clk_set_parent); * very large numbers of clocks that need to be statically initialized. It is * a layering violation to include clk-private.h from any code which implements * a clock's .ops; as such any statically initialized clock data MUST be in a - * separate C file from the logic that implements it's operations. + * separate C file from the logic that implements it's operations. Returns 0 + * on success, otherwise an error code. */ -void __clk_init(struct device *dev, struct clk *clk) +int __clk_init(struct device *dev, struct clk *clk) { - int i; + int i, ret = 0; struct clk *orphan; struct hlist_node *tmp, *tmp2; if (!clk) - return; + return -EINVAL; mutex_lock(&prepare_lock); /* check to see if a clock with this name is already registered */ - if (__clk_lookup(clk->name)) + if (__clk_lookup(clk->name)) { + pr_debug("%s: clk %s already initialized\n", + __func__, clk->name); + ret = -EEXIST; goto out; + } /* check that clk_ops are sane. See Documentation/clk.txt */ if (clk->ops->set_rate && !(clk->ops->round_rate && clk->ops->recalc_rate)) { pr_warning("%s: %s must implement .round_rate & .recalc_rate\n", __func__, clk->name); + ret = -EINVAL; goto out; } if (clk->ops->set_parent && !clk->ops->get_parent) { pr_warning("%s: %s must implement .get_parent & .set_parent\n", __func__, clk->name); + ret = -EINVAL; goto out; } @@ -1308,7 +1315,7 @@ void __clk_init(struct device *dev, struct clk *clk) out: mutex_unlock(&prepare_lock); - return; + return ret; } /** @@ -1324,29 +1331,63 @@ out: * clk_register is the primary interface for populating the clock tree with new * clock nodes. It returns a pointer to the newly allocated struct clk which * cannot be dereferenced by driver code but may be used in conjuction with the - * rest of the clock API. + * rest of the clock API. In the event of an error clk_register will return an + * error code; drivers must test for an error code after calling clk_register. */ struct clk *clk_register(struct device *dev, const char *name, const struct clk_ops *ops, struct clk_hw *hw, const char **parent_names, u8 num_parents, unsigned long flags) { + int i, ret; struct clk *clk; clk = kzalloc(sizeof(*clk), GFP_KERNEL); - if (!clk) - return NULL; + if (!clk) { + pr_err("%s: could not allocate clk\n", __func__); + ret = -ENOMEM; + goto fail_out; + } clk->name = name; clk->ops = ops; clk->hw = hw; clk->flags = flags; - clk->parent_names = parent_names; clk->num_parents = num_parents; hw->clk = clk; - __clk_init(dev, clk); + /* allocate local copy in case parent_names is __initdata */ + clk->parent_names = kzalloc((sizeof(char*) * num_parents), + GFP_KERNEL); + + if (!clk->parent_names) { + pr_err("%s: could not allocate clk->parent_names\n", __func__); + ret = -ENOMEM; + goto fail_parent_names; + } + + + /* copy each string name in case parent_names is __initdata */ + for (i = 0; i < num_parents; i++) { + clk->parent_names[i] = kstrdup(parent_names[i], GFP_KERNEL); + if (!clk->parent_names[i]) { + pr_err("%s: could not copy parent_names\n", __func__); + ret = -ENOMEM; + goto fail_parent_names_copy; + } + } + + ret = __clk_init(dev, clk); + if (!ret) + return clk; - return clk; +fail_parent_names_copy: + while (--i >= 0) + kfree(clk->parent_names[i]); + kfree(clk->parent_names); +fail_parent_names: + kfree(clk); +fail_out: + return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(clk_register); |