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dma: of: Remove check on always true condition

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Both of_dma_nbcells field of the of_dma_controller and the args_count field of
the dma_spec are initialized by parsing the #dma-cells attribute of their device
tree node. So if the device tree nodes of a DMA controller and the dma_spec
match this means that of_dma_nbcells and args_count will also match. So the
second test in the of_dma_find_controller loop is redundant because given the
first test yields true the second test will also yield true. So we can safely
remove the test whether of_dma_nbcells matches args_count. Since this was the
last user of the of_dma_nbcells field we can remove it altogether.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Lars-Peter Clausen 2013-04-22 10:33:33 +02:00 committed by Vinod Koul
parent ff0e0f4f56
commit 8552bb4f16
2 changed files with 1 additions and 14 deletions
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14
drivers/dma/of-dma.c
View File

@ -35,8 +35,7 @@ static struct of_dma *of_dma_find_controller(struct of_phandle_args *dma_spec)
struct of_dma *ofdma;
list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers)
if ((ofdma->of_node == dma_spec->np) &&
(ofdma->of_dma_nbcells == dma_spec->args_count))
if (ofdma->of_node == dma_spec->np)
return ofdma;
pr_debug("%s: can't find DMA controller %s\n", __func__,
@ -64,7 +63,6 @@ int of_dma_controller_register(struct device_node *np,
void *data)
{
struct of_dma *ofdma;
const __be32 *prop;
if (!np || !of_dma_xlate) {
pr_err("%s: not enough information provided\n", __func__);
@ -75,17 +73,7 @@ int of_dma_controller_register(struct device_node *np,
if (!ofdma)
return -ENOMEM;
prop = of_get_property(np, "#dma-cells", NULL);
if (!prop) {
pr_err("%s: #dma-cells property is missing\n",
__func__);
kfree(ofdma);
return -EINVAL;
}
ofdma->of_node = np;
ofdma->of_dma_nbcells = be32_to_cpup(prop);
ofdma->of_dma_xlate = of_dma_xlate;
ofdma->of_dma_data = data;

1
include/linux/of_dma.h
View File

@ -21,7 +21,6 @@ struct device_node;
struct of_dma {
struct list_head of_dma_controllers;
struct device_node *of_node;
int of_dma_nbcells;
struct dma_chan *(*of_dma_xlate)
(struct of_phandle_args *, struct of_dma *);
void *of_dma_data;