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authorBrian Norris <computersforpeace@gmail.com>2013-12-13 21:19:58 -0800
committerBrian Norris <computersforpeace@gmail.com>2014-01-07 10:07:34 -0800
commit103cdd8520b5ec85ab4345f54db5cc32a517f468 (patch)
tree989ce95429095a3a4ea6452b110a859d88b4b7f9
parenta01eb2043b84bd6d595df58b7eba4f8841050b5e (diff)
mtd: nand-gpio: don't waste memory for OF failure
We shouldn't try to allocate a resource until we're sure the of_property_read_u64() call didn't fail. This is especially important if we use this code for both CONFIG_OF and !CONFIG_OF builds, since of_property_read_u64() will always return -ENOSYS for !CONFIG_OF. Signed-off-by: Brian Norris <computersforpeace@gmail.com>
-rw-r--r--drivers/mtd/nand/gpio.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/mtd/nand/gpio.c b/drivers/mtd/nand/gpio.c
index 8dfdbb63e096..8e6148aa4539 100644
--- a/drivers/mtd/nand/gpio.c
+++ b/drivers/mtd/nand/gpio.c
@@ -132,13 +132,17 @@ static int gpio_nand_get_config_of(const struct device *dev,
static struct resource *gpio_nand_get_io_sync_of(struct platform_device *pdev)
{
- struct resource *r = devm_kzalloc(&pdev->dev, sizeof(*r), GFP_KERNEL);
+ struct resource *r;
u64 addr;
- if (!r || of_property_read_u64(pdev->dev.of_node,
+ if (of_property_read_u64(pdev->dev.of_node,
"gpio-control-nand,io-sync-reg", &addr))
return NULL;
+ r = devm_kzalloc(&pdev->dev, sizeof(*r), GFP_KERNEL);
+ if (!r)
+ return NULL;
+
r->start = addr;
r->end = r->start + 0x3;
r->flags = IORESOURCE_MEM;