spi/dw_spi: don't treat NULL clk as an error

clk_get() returns a struct clk cookie to the driver and some platforms
may return NULL if they only support a single clock.  clk_get() has only
failed if it returns a ERR_PTR() encoded pointer.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/spi/dw_spi_mmio.c b/drivers/spi/dw_spi_mmio.c
index db35bd9c1b24..2fa012c109bc 100644
--- a/drivers/spi/dw_spi_mmio.c
+++ b/drivers/spi/dw_spi_mmio.c
@@ -9,6 +9,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
@@ -68,8 +69,8 @@ static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
         }
 
         dwsmmio->clk = clk_get(&pdev->dev, NULL);
-        if (!dwsmmio->clk) {
-                ret = -ENODEV;
+        if (IS_ERR(dwsmmio->clk)) {
+                ret = PTR_ERR(dwsmmio->clk);
                 goto err_irq;
         }
         clk_enable(dwsmmio->clk);