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authorAndre Przywara <andre.przywara@arm.com>2016-02-16 13:46:07 +0300
committerMaxime Ripard <maxime.ripard@free-electrons.com>2016-02-22 06:44:38 +0300
commitb26803ebfba8d81e2e8fb392c1248df2ebd1ba83 (patch)
tree426d3015823bb16f790aa6e94fc08a0914480de2 /drivers/clk/sunxi/clk-sunxi.c
parent72360b91164aa35753942e5310ae1e1d16e28611 (diff)
downloadlinux-b26803ebfba8d81e2e8fb392c1248df2ebd1ba83.tar.xz
clk: sunxi: improve divider_clk error handling and reporting
We now report a failing ioremap, failing output names parsing, failures in table registration and in the final step. Also there was a bug where clk_register_divider_table() would return an ERR_PTR value instead of NULL, which we were checking for. We now implement proper rollback in case of an error. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Diffstat (limited to 'drivers/clk/sunxi/clk-sunxi.c')
-rw-r--r--drivers/clk/sunxi/clk-sunxi.c36
1 files changed, 33 insertions, 3 deletions
diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 775e13776f84..4bd09179a401 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -805,17 +805,47 @@ static void __init sunxi_divider_clk_setup(struct device_node *node,
void __iomem *reg;
reg = of_iomap(node, 0);
+ if (!reg) {
+ pr_err("Could not map registers for mux-clk: %s\n",
+ of_node_full_name(node));
+ return;
+ }
clk_parent = of_clk_get_parent_name(node, 0);
- of_property_read_string(node, "clock-output-names", &clk_name);
+ if (of_property_read_string(node, "clock-output-names", &clk_name)) {
+ pr_err("%s: could not read clock-output-names from \"%s\"\n",
+ __func__, of_node_full_name(node));
+ goto out_unmap;
+ }
clk = clk_register_divider_table(NULL, clk_name, clk_parent, 0,
reg, data->shift, data->width,
data->pow ? CLK_DIVIDER_POWER_OF_TWO : 0,
data->table, &clk_lock);
- if (clk)
- of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ if (IS_ERR(clk)) {
+ pr_err("%s: failed to register divider clock %s: %ld\n",
+ __func__, clk_name, PTR_ERR(clk));
+ goto out_unmap;
+ }
+
+ if (of_clk_add_provider(node, of_clk_src_simple_get, clk)) {
+ pr_err("%s: failed to add clock provider for %s\n",
+ __func__, clk_name);
+ goto out_unregister;
+ }
+
+ if (clk_register_clkdev(clk, clk_name, NULL)) {
+ of_clk_del_provider(node);
+ goto out_unregister;
+ }
+
+ return;
+out_unregister:
+ clk_unregister_divider(clk);
+
+out_unmap:
+ iounmap(reg);
}
static void __init sun4i_ahb_clk_setup(struct device_node *node)