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drivers: clk: Handle gracefully NULL pointers

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Prepare the way for a managed CLK API by handling NULL pointers without
crashing nor failing.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
This commit is contained in:
Jean-Jacques Hiblot 2019-10-22 14:00:03 +02:00 committed by Lukasz Majewski
parent 727fa4539c
commit 8a1661f20e
2 changed files with 37 additions and 8 deletions
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43
drivers/clk/clk-uclass.c
View File

@ -349,9 +349,12 @@ int clk_release_all(struct clk *clk, int count)
int clk_request(struct udevice *dev, struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(dev);
const struct clk_ops *ops;
debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
if (!clk)
return 0;
ops = clk_dev_ops(dev);
clk->dev = dev;
@ -363,9 +366,12 @@ int clk_request(struct udevice *dev, struct clk *clk)
int clk_free(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
const struct clk_ops *ops;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (!ops->free)
return 0;
@ -375,9 +381,12 @@ int clk_free(struct clk *clk)
ulong clk_get_rate(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
const struct clk_ops *ops;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (!ops->get_rate)
return -ENOSYS;
@ -391,6 +400,8 @@ struct clk *clk_get_parent(struct clk *clk)
struct clk *pclk;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return NULL;
pdev = dev_get_parent(clk->dev);
pclk = dev_get_clk_ptr(pdev);
@ -406,6 +417,8 @@ long long clk_get_parent_rate(struct clk *clk)
struct clk *pclk;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
pclk = clk_get_parent(clk);
if (IS_ERR(pclk))
@ -424,9 +437,12 @@ long long clk_get_parent_rate(struct clk *clk)
ulong clk_set_rate(struct clk *clk, ulong rate)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
const struct clk_ops *ops;
debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (!ops->set_rate)
return -ENOSYS;
@ -436,9 +452,12 @@ ulong clk_set_rate(struct clk *clk, ulong rate)
int clk_set_parent(struct clk *clk, struct clk *parent)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
const struct clk_ops *ops;
debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (!ops->set_parent)
return -ENOSYS;
@ -448,11 +467,14 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
int clk_enable(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
const struct clk_ops *ops;
struct clk *clkp = NULL;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (CONFIG_IS_ENABLED(CLK_CCF)) {
/* Take id 0 as a non-valid clk, such as dummy */
@ -505,11 +527,14 @@ int clk_enable_bulk(struct clk_bulk *bulk)
int clk_disable(struct clk *clk)
{
const struct clk_ops *ops = clk_dev_ops(clk->dev);
const struct clk_ops *ops;
struct clk *clkp = NULL;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
if (!clk)
return 0;
ops = clk_dev_ops(clk->dev);
if (CONFIG_IS_ENABLED(CLK_CCF)) {
if (clk->id && !clk_get_by_id(clk->id, &clkp)) {
@ -589,6 +614,10 @@ bool clk_is_match(const struct clk *p, const struct clk *q)
if (p == q)
return true;
/* trivial case #2: on the clk pointer is NULL */
if (!p || !q)
return false;
/* same device, id and data */
if (p->dev == q->dev && p->id == q->id && p->data == q->data)
return true;

2
include/clk.h
View File

@ -356,7 +356,7 @@ int soc_clk_dump(void);
*/
static inline bool clk_valid(struct clk *clk)
{
return !!clk->dev;
return clk && !!clk->dev;
}
/**