[media] cx88: convert struct cx88_core.refcount from atomic_t to refcount_t

refcount_t is better suitable for counting references than atomic_t.
Signed-off-by: NElena Reshetova <elena.reshetova@intel.com>
Signed-off-by: NHans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NDavid Windsor <dwindsor@gmail.com>
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/cx88/cx88-cards.c

@@ -3670,7 +3670,7 @@ struct cx88_core *cx88_core_create(struct pci_dev *pci, int nr)
 	if (!core)
 		return NULL;
 
-	atomic_inc(&core->refcount);
+	refcount_set(&core->refcount, 1);
 	core->pci_bus  = pci->bus->number;
 	core->pci_slot = PCI_SLOT(pci->devfn);
 	core->pci_irqmask = PCI_INT_RISC_RD_BERRINT | PCI_INT_RISC_WR_BERRINT |

drivers/media/pci/cx88/cx88-core.c

@@ -1052,7 +1052,7 @@ struct cx88_core *cx88_core_get(struct pci_dev *pci)
 			mutex_unlock(&devlist);
 			return NULL;
 		}
-		atomic_inc(&core->refcount);
+		refcount_inc(&core->refcount);
 		mutex_unlock(&devlist);
 		return core;
 	}
@@ -1073,7 +1073,7 @@ void cx88_core_put(struct cx88_core *core, struct pci_dev *pci)
 	release_mem_region(pci_resource_start(pci, 0),
 			   pci_resource_len(pci, 0));
 
-	if (!atomic_dec_and_test(&core->refcount))
+	if (!refcount_dec_and_test(&core->refcount))
 		return;
 
 	mutex_lock(&devlist);

drivers/media/pci/cx88/cx88.h

@@ -24,6 +24,7 @@
 #include <linux/i2c-algo-bit.h>
 #include <linux/videodev2.h>
 #include <linux/kdev_t.h>
+#include <linux/refcount.h>
 
 #include <media/v4l2-device.h>
 #include <media/v4l2-fh.h>
@@ -339,7 +340,7 @@ struct cx8802_dev;
 
 struct cx88_core {
 	struct list_head           devlist;
-	atomic_t                   refcount;
+	refcount_t		   refcount;
 
 	/* board name */
 	int                        nr;