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Subject[PATCH 1/7] ASoC: Intel: drop unnecessary list_empty
Date
list_for_each_entry_safe is able to handle an empty list.
The only effect of avoiding the loop is not initializing the
index variable.
Drop list_empty tests in cases where these variables are not
used.

Note that list_for_each_entry_safe is defined in terms of
list_first_entry, which indicates that it should not be used on an
empty list. But in list_for_each_entry_safe, the element obtained by
list_first_entry is not really accessed, only the address of its
list_head field is compared to the address of the list head, so the
list_first_entry is safe.

The semantic patch that makes this change is as follows (with another
variant for the no brace case): (http://coccinelle.lip6.fr/)

<smpl>
@@
expression x,e;
iterator name list_for_each_entry_safe;
statement S;
identifier i,j;
@@
-if (!(list_empty(x))) {
list_for_each_entry_safe(i,j,x,...) S
- }
... when != i
when != j
(
i = e;
|
? j = e;
)
</smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>

---
sound/soc/intel/atom/sst/sst_loader.c | 10 ++++------
sound/soc/intel/skylake/skl-pcm.c | 8 +++-----
sound/soc/intel/skylake/skl-topology.c | 5 ++---
3 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/sound/soc/intel/atom/sst/sst_loader.c b/sound/soc/intel/atom/sst/sst_loader.c
index 8ad0ca7..fc91a30 100644
--- a/sound/soc/intel/atom/sst/sst_loader.c
+++ b/sound/soc/intel/atom/sst/sst_loader.c
@@ -276,12 +276,10 @@ void sst_memcpy_free_resources(struct intel_sst_drv *sst_drv_ctx)
struct sst_memcpy_list *listnode, *tmplistnode;

/* Free the list */
- if (!list_empty(&sst_drv_ctx->memcpy_list)) {
- list_for_each_entry_safe(listnode, tmplistnode,
- &sst_drv_ctx->memcpy_list, memcpylist) {
- list_del(&listnode->memcpylist);
- kfree(listnode);
- }
+ list_for_each_entry_safe(listnode, tmplistnode,
+ &sst_drv_ctx->memcpy_list, memcpylist) {
+ list_del(&listnode->memcpylist);
+ kfree(listnode);
}
}

diff --git a/sound/soc/intel/skylake/skl-pcm.c b/sound/soc/intel/skylake/skl-pcm.c
index 89dcccd..9e15b06 100644
--- a/sound/soc/intel/skylake/skl-pcm.c
+++ b/sound/soc/intel/skylake/skl-pcm.c
@@ -1509,11 +1509,9 @@ int skl_platform_unregister(struct device *dev)
struct skl_dev *skl = bus_to_skl(bus);
struct skl_module_deferred_bind *modules, *tmp;

- if (!list_empty(&skl->bind_list)) {
- list_for_each_entry_safe(modules, tmp, &skl->bind_list, node) {
- list_del(&modules->node);
- kfree(modules);
- }
+ list_for_each_entry_safe(modules, tmp, &skl->bind_list, node) {
+ list_del(&modules->node);
+ kfree(modules);
}

kfree(skl->dais);
diff --git a/sound/soc/intel/skylake/skl-topology.c b/sound/soc/intel/skylake/skl-topology.c
index b9aab47..b7d2d97 100644
--- a/sound/soc/intel/skylake/skl-topology.c
+++ b/sound/soc/intel/skylake/skl-topology.c
@@ -3773,9 +3773,8 @@ void skl_tplg_exit(struct snd_soc_component *component, struct hdac_bus *bus)
struct skl_dev *skl = bus_to_skl(bus);
struct skl_pipeline *ppl, *tmp;

- if (!list_empty(&skl->ppl_list))
- list_for_each_entry_safe(ppl, tmp, &skl->ppl_list, node)
- list_del(&ppl->node);
+ list_for_each_entry_safe(ppl, tmp, &skl->ppl_list, node)
+ list_del(&ppl->node);

/* clean up topology */
snd_soc_tplg_component_remove(component, SND_SOC_TPLG_INDEX_ALL);
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