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Message-id: <1401098701-24049-1-git-send-email-heesub.shin@samsung.com>
Date: Mon, 26 May 2014 19:04:53 +0900
From: Heesub Shin <heesub.shin@...sung.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: John Stultz <john.stultz@...aro.org>,
Rebecca Schultz Zavin <rebecca@...roid.com>,
Colin Cross <ccross@...roid.com>,
Arve Hjønnevåg <arve@...roid.com>,
Mitchel Humpherys <mitchelh@...eaurora.org>,
Daeseok Youn <daeseok.youn@...il.com>,
Sunghwan Yun <sunghwan.yun@...sung.com>,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
Heesub Shin <heesub.shin@...sung.com>
Subject: [PATCH 1/9] staging: ion: tidy up a bit
For aesthetics and readability, rename goto labels, remove
useless code lines, and clarify function return type.
Signed-off-by: Heesub Shin <heesub.shin@...sung.com>
---
drivers/staging/android/ion/ion_page_pool.c | 2 +-
drivers/staging/android/ion/ion_priv.h | 2 +-
drivers/staging/android/ion/ion_system_heap.c | 57 ++++++++++++---------------
3 files changed, 28 insertions(+), 33 deletions(-)
diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
index ecb5fc3..ead4054 100644
--- a/drivers/staging/android/ion/ion_page_pool.c
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -89,7 +89,7 @@ static struct page *ion_page_pool_remove(struct ion_page_pool *pool, bool high)
return page;
}
-void *ion_page_pool_alloc(struct ion_page_pool *pool)
+struct page *ion_page_pool_alloc(struct ion_page_pool *pool)
{
struct page *page = NULL;
diff --git a/drivers/staging/android/ion/ion_priv.h b/drivers/staging/android/ion/ion_priv.h
index 1eba3f2..365c947 100644
--- a/drivers/staging/android/ion/ion_priv.h
+++ b/drivers/staging/android/ion/ion_priv.h
@@ -377,7 +377,7 @@ struct ion_page_pool {
struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order);
void ion_page_pool_destroy(struct ion_page_pool *);
-void *ion_page_pool_alloc(struct ion_page_pool *);
+struct page *ion_page_pool_alloc(struct ion_page_pool *);
void ion_page_pool_free(struct ion_page_pool *, struct page *);
/** ion_page_pool_shrink - shrinks the size of the memory cached in the pool
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index c923633..b554751 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -41,7 +41,7 @@ static int order_to_index(unsigned int order)
return -1;
}
-static unsigned int order_to_size(int order)
+static inline unsigned int order_to_size(int order)
{
return PAGE_SIZE << order;
}
@@ -78,8 +78,6 @@ static struct page *alloc_buffer_page(struct ion_system_heap *heap,
ion_pages_sync_for_device(NULL, page, PAGE_SIZE << order,
DMA_BIDIRECTIONAL);
}
- if (!page)
- return NULL;
return page;
}
@@ -124,7 +122,6 @@ static struct page_info *alloc_largest_available(struct ion_system_heap *heap,
info->page = page;
info->order = orders[i];
- INIT_LIST_HEAD(&info->list);
return info;
}
kfree(info);
@@ -142,7 +139,6 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
heap);
struct sg_table *table;
struct scatterlist *sg;
- int ret;
struct list_head pages;
struct page_info *info, *tmp_info;
int i = 0;
@@ -160,24 +156,23 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
info = alloc_largest_available(sys_heap, buffer, size_remaining,
max_order);
if (!info)
- goto err;
+ goto free_pages;
list_add_tail(&info->list, &pages);
- size_remaining -= (1 << info->order) * PAGE_SIZE;
+ size_remaining -= PAGE_SIZE << info->order;
max_order = info->order;
i++;
}
table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
if (!table)
- goto err;
+ goto free_pages;
- ret = sg_alloc_table(table, i, GFP_KERNEL);
- if (ret)
- goto err1;
+ if (sg_alloc_table(table, i, GFP_KERNEL))
+ goto free_table;
sg = table->sgl;
list_for_each_entry_safe(info, tmp_info, &pages, list) {
struct page *page = info->page;
- sg_set_page(sg, page, (1 << info->order) * PAGE_SIZE, 0);
+ sg_set_page(sg, page, PAGE_SIZE << info->order, 0);
sg = sg_next(sg);
list_del(&info->list);
kfree(info);
@@ -185,9 +180,10 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
buffer->priv_virt = table;
return 0;
-err1:
+
+free_table:
kfree(table);
-err:
+free_pages:
list_for_each_entry_safe(info, tmp_info, &pages, list) {
free_buffer_page(sys_heap, buffer, info->page, info->order);
kfree(info);
@@ -197,14 +193,12 @@ err:
static void ion_system_heap_free(struct ion_buffer *buffer)
{
- struct ion_heap *heap = buffer->heap;
- struct ion_system_heap *sys_heap = container_of(heap,
+ struct ion_system_heap *sys_heap = container_of(buffer->heap,
struct ion_system_heap,
heap);
struct sg_table *table = buffer->sg_table;
bool cached = ion_buffer_cached(buffer);
struct scatterlist *sg;
- LIST_HEAD(pages);
int i;
/* uncached pages come from the page pools, zero them before returning
@@ -271,10 +265,10 @@ static int ion_system_heap_debug_show(struct ion_heap *heap, struct seq_file *s,
struct ion_page_pool *pool = sys_heap->pools[i];
seq_printf(s, "%d order %u highmem pages in pool = %lu total\n",
pool->high_count, pool->order,
- (1 << pool->order) * PAGE_SIZE * pool->high_count);
+ (PAGE_SIZE << pool->order) * pool->high_count);
seq_printf(s, "%d order %u lowmem pages in pool = %lu total\n",
pool->low_count, pool->order,
- (1 << pool->order) * PAGE_SIZE * pool->low_count);
+ (PAGE_SIZE << pool->order) * pool->low_count);
}
return 0;
}
@@ -293,7 +287,7 @@ struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
heap->pools = kzalloc(sizeof(struct ion_page_pool *) * num_orders,
GFP_KERNEL);
if (!heap->pools)
- goto err_alloc_pools;
+ goto free_heap;
for (i = 0; i < num_orders; i++) {
struct ion_page_pool *pool;
gfp_t gfp_flags = low_order_gfp_flags;
@@ -302,18 +296,18 @@ struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
gfp_flags = high_order_gfp_flags;
pool = ion_page_pool_create(gfp_flags, orders[i]);
if (!pool)
- goto err_create_pool;
+ goto destroy_pools;
heap->pools[i] = pool;
}
heap->heap.debug_show = ion_system_heap_debug_show;
return &heap->heap;
-err_create_pool:
- for (i = 0; i < num_orders; i++)
- if (heap->pools[i])
- ion_page_pool_destroy(heap->pools[i]);
+
+destroy_pools:
+ while (i--)
+ ion_page_pool_destroy(heap->pools[i]);
kfree(heap->pools);
-err_alloc_pools:
+free_heap:
kfree(heap);
return ERR_PTR(-ENOMEM);
}
@@ -359,12 +353,12 @@ static int ion_system_contig_heap_allocate(struct ion_heap *heap,
table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
if (!table) {
ret = -ENOMEM;
- goto out;
+ goto free_pages;
}
ret = sg_alloc_table(table, 1, GFP_KERNEL);
if (ret)
- goto out;
+ goto free_table;
sg_set_page(table->sgl, page, len, 0);
@@ -374,10 +368,12 @@ static int ion_system_contig_heap_allocate(struct ion_heap *heap,
return 0;
-out:
+free_table:
+ kfree(table);
+free_pages:
for (i = 0; i < len >> PAGE_SHIFT; i++)
__free_page(page + i);
- kfree(table);
+
return ret;
}
@@ -443,4 +439,3 @@ void ion_system_contig_heap_destroy(struct ion_heap *heap)
{
kfree(heap);
}
-
--
1.9.1
--
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