spi: release device claimed by bus_find_device_by_name

In success case the function bus_find_device_by_name calls
get_device. In our context put_device should be called to
decrease the device count usage.

Signed-off-by: Roman Tereshonkov <roman.tereshonkov@nokia.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 9ffb0fdbd6fe..ec429d156a57 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -257,6 +257,7 @@ int spi_add_device(struct spi_device *spi)
 {
         static DEFINE_MUTEX(spi_add_lock);
         struct device *dev = spi->master->dev.parent;
+        struct device *d;
         int status;
 
         /* Chipselects are numbered 0..max; validate. */
@@ -278,10 +279,11 @@ int spi_add_device(struct spi_device *spi)
          */
         mutex_lock(&spi_add_lock);
 
-        if (bus_find_device_by_name(&spi_bus_type, NULL, dev_name(&spi->dev))
-                        != NULL) {
+        d = bus_find_device_by_name(&spi_bus_type, NULL, dev_name(&spi->dev));
+        if (d != NULL) {
                 dev_err(dev, "chipselect %d already in use\n",
                                 spi->chip_select);
+                put_device(d);
                 status = -EBUSY;
                 goto done;
         }