net: ipa: introduce gsi_channel_initialized()

Create a simple helper function that indicates whether a channel has
been initialized.  This abstacts/hides the details of how this is
determined.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/gsi.c

@@ -175,6 +175,12 @@ static u32 gsi_channel_id(struct gsi_channel *channel)
 	return channel - &channel->gsi->channel[0];
 }
 
+/* An initialized channel has a non-null GSI pointer */
+static bool gsi_channel_initialized(struct gsi_channel *channel)
+{
+	return !!channel->gsi;
+}
+
 /* Update the GSI IRQ type register with the cached value */
 static void gsi_irq_type_update(struct gsi *gsi, u32 val)
 {
@@ -1638,8 +1644,8 @@ static int gsi_channel_setup_one(struct gsi *gsi, u32 channel_id)
 	u32 evt_ring_id = channel->evt_ring_id;
 	int ret;
 
-	if (!channel->gsi)
-		return 0;	/* Ignore uninitialized channels */
+	if (!gsi_channel_initialized(channel))
+		return 0;
 
 	ret = gsi_evt_ring_alloc_command(gsi, evt_ring_id);
 	if (ret)
@@ -1675,8 +1681,8 @@ static void gsi_channel_teardown_one(struct gsi *gsi, u32 channel_id)
 	struct gsi_channel *channel = &gsi->channel[channel_id];
 	u32 evt_ring_id = channel->evt_ring_id;
 
-	if (!channel->gsi)
-		return;		/* Ignore uninitialized channels */
+	if (!gsi_channel_initialized(channel))
+		return;
 
 	netif_napi_del(&channel->napi);
 
@@ -1770,8 +1776,8 @@ static int gsi_channel_setup(struct gsi *gsi)
 	while (channel_id < GSI_CHANNEL_COUNT_MAX) {
 		struct gsi_channel *channel = &gsi->channel[channel_id++];
 
-		if (!channel->gsi)
-			continue;	/* Ignore uninitialized channels */
+		if (!gsi_channel_initialized(channel))
+			continue;
 
 		ret = -EINVAL;
 		dev_err(gsi->dev, "channel %u not supported by hardware\n",
@@ -2089,8 +2095,8 @@ static int gsi_channel_init_one(struct gsi *gsi,
 /* Inverse of gsi_channel_init_one() */
 static void gsi_channel_exit_one(struct gsi_channel *channel)
 {
-	if (!channel->gsi)
-		return;		/* Ignore uninitialized channels */
+	if (!gsi_channel_initialized(channel))
+		return;
 
 	if (channel->command)
 		ipa_cmd_pool_exit(channel);