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dma-coherent: fix dma_declare_coherent_memory() logic error

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A recent change interprets the return code of dma_init_coherent_memory
as an error value, but it is instead a boolean, where 'true' indicates
success. This leads causes the caller to always do the wrong thing,
and also triggers a compile-time warning about it:

drivers/base/dma-coherent.c: In function 'dma_declare_coherent_memory':
drivers/base/dma-coherent.c:99:15: error: 'mem' may be used uninitialized in this function [-Werror=maybe-uninitialized]

I ended up changing the code a little more, to give use the usual
error handling, as this seemed the best way to fix up the warning
and make the code look reasonable at the same time.

Fixes: 2436bdcda5 ("dma-coherent: remove the DMA_MEMORY_MAP and DMA_MEMORY_IO flags")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Arnd Bergmann 2017-09-05 10:10:09 +02:00 committed by Christoph Hellwig
parent edeb8e4ccb
commit d35b0996fe
1 changed files with 25 additions and 13 deletions
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38
drivers/base/dma-coherent.c
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@ -37,7 +37,7 @@ static inline dma_addr_t dma_get_device_base(struct device *dev,
return mem->device_base; return mem->device_base;
} }
static bool dma_init_coherent_memory( static int dma_init_coherent_memory(
phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags, phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags,
struct dma_coherent_mem **mem) struct dma_coherent_mem **mem)
{ {
@ -45,20 +45,28 @@ static bool dma_init_coherent_memory(
void __iomem *mem_base = NULL; void __iomem *mem_base = NULL;
int pages = size >> PAGE_SHIFT; int pages = size >> PAGE_SHIFT;
int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
int ret;
if (!size) if (!size) {
ret = -EINVAL;
goto out; goto out;
}
mem_base = memremap(phys_addr, size, MEMREMAP_WC); mem_base = memremap(phys_addr, size, MEMREMAP_WC);
if (!mem_base) if (!mem_base) {
ret = -EINVAL;
goto out; goto out;
}
dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL); dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
if (!dma_mem) if (!dma_mem) {
ret = -ENOMEM;
goto out; goto out;
}
dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL); dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
if (!dma_mem->bitmap) if (!dma_mem->bitmap) {
ret = -ENOMEM;
goto out; goto out;
}
dma_mem->virt_base = mem_base; dma_mem->virt_base = mem_base;
dma_mem->device_base = device_addr; dma_mem->device_base = device_addr;
@ -68,13 +76,13 @@ static bool dma_init_coherent_memory(
spin_lock_init(&dma_mem->spinlock); spin_lock_init(&dma_mem->spinlock);
*mem = dma_mem; *mem = dma_mem;
return true; return 0;
out: out:
kfree(dma_mem); kfree(dma_mem);
if (mem_base) if (mem_base)
memunmap(mem_base); memunmap(mem_base);
return false; return ret;
} }
static void dma_release_coherent_memory(struct dma_coherent_mem *mem) static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
@ -338,14 +346,18 @@ static struct reserved_mem *dma_reserved_default_memory __initdata;
static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev) static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
{ {
struct dma_coherent_mem *mem = rmem->priv; struct dma_coherent_mem *mem = rmem->priv;
int ret;
if (!mem && if (!mem)
!dma_init_coherent_memory(rmem->base, rmem->base, rmem->size, return -ENODEV;
DMA_MEMORY_EXCLUSIVE,
&mem)) { ret = dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
DMA_MEMORY_EXCLUSIVE, &mem);
if (ret) {
pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n", pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
&rmem->base, (unsigned long)rmem->size / SZ_1M); &rmem->base, (unsigned long)rmem->size / SZ_1M);
return -ENODEV; return ret;
} }
mem->use_dev_dma_pfn_offset = true; mem->use_dev_dma_pfn_offset = true;
rmem->priv = mem; rmem->priv = mem;