net: ipa: use state to determine channel command success

The result of issuing a channel control command should be that the
channel changes state.  If enabled, a completion interrupt signals
that the channel state has changed.  This interrupt is enabled by
gsi_channel_command() and disabled again after the command has
completed (or we time out).

There is a window of time--after the completion interrupt is disabled
but before the channel state is read--during which the command could
complete successfully without interrupting.  This would cause the
channel to transition to the desired new state.

So whether a channel command ends via completion interrupt or
timeout, we can consider the command successful if the channel
has entered the desired state (and a failure if it has not,
regardless of the cause).

Fixes: d6c9e3f506 ("net: ipa: only enable generic command completion IRQ when needed");
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/gsi.c

@@ -505,15 +505,15 @@ static int gsi_channel_alloc_command(struct gsi *gsi, u32 channel_id)
 
 	ret = gsi_channel_command(channel, GSI_CH_ALLOCATE);
 
-	/* Channel state will normally have been updated */
+	/* If successful the channel state will have changed */
 	state = gsi_channel_state(channel);
-	if (!ret && state != GSI_CHANNEL_STATE_ALLOCATED) {
-		dev_err(dev, "channel %u bad state %u after alloc\n",
-			channel_id, state);
-		ret = -EIO;
-	}
+	if (state == GSI_CHANNEL_STATE_ALLOCATED)
+		return 0;
 
-	return ret;
+	dev_err(dev, "channel %u bad state %u after alloc\n",
+		channel_id, state);
+
+	return -EIO;
 }
 
 /* Start an ALLOCATED channel */
@@ -533,15 +533,15 @@ static int gsi_channel_start_command(struct gsi_channel *channel)
 
 	ret = gsi_channel_command(channel, GSI_CH_START);
 
-	/* Channel state will normally have been updated */
+	/* If successful the channel state will have changed */
 	state = gsi_channel_state(channel);
-	if (!ret && state != GSI_CHANNEL_STATE_STARTED) {
-		dev_err(dev, "channel %u bad state %u after start\n",
-			gsi_channel_id(channel), state);
-		ret = -EIO;
-	}
+	if (state == GSI_CHANNEL_STATE_STARTED)
+		return 0;
 
-	return ret;
+	dev_err(dev, "channel %u bad state %u after start\n",
+		gsi_channel_id(channel), state);
+
+	return -EIO;
 }
 
 /* Stop a GSI channel in STARTED state */
@@ -568,10 +568,10 @@ static int gsi_channel_stop_command(struct gsi_channel *channel)
 
 	ret = gsi_channel_command(channel, GSI_CH_STOP);
 
-	/* Channel state will normally have been updated */
+	/* If successful the channel state will have changed */
 	state = gsi_channel_state(channel);
-	if (ret || state == GSI_CHANNEL_STATE_STOPPED)
-		return ret;
+	if (state == GSI_CHANNEL_STATE_STOPPED)
+		return 0;
 
 	/* We may have to try again if stop is in progress */
 	if (state == GSI_CHANNEL_STATE_STOP_IN_PROC)
@@ -604,9 +604,9 @@ static void gsi_channel_reset_command(struct gsi_channel *channel)
 
 	ret = gsi_channel_command(channel, GSI_CH_RESET);
 
-	/* Channel state will normally have been updated */
+	/* If successful the channel state will have changed */
 	state = gsi_channel_state(channel);
-	if (!ret && state != GSI_CHANNEL_STATE_ALLOCATED)
+	if (state != GSI_CHANNEL_STATE_ALLOCATED)
 		dev_err(dev, "channel %u bad state %u after reset\n",
 			gsi_channel_id(channel), state);
 }
@@ -628,9 +628,10 @@ static void gsi_channel_de_alloc_command(struct gsi *gsi, u32 channel_id)
 
 	ret = gsi_channel_command(channel, GSI_CH_DE_ALLOC);
 
-	/* Channel state will normally have been updated */
+	/* If successful the channel state will have changed */
 	state = gsi_channel_state(channel);
-	if (!ret && state != GSI_CHANNEL_STATE_NOT_ALLOCATED)
+
+	if (state != GSI_CHANNEL_STATE_NOT_ALLOCATED)
 		dev_err(dev, "channel %u bad state %u after dealloc\n",
 			channel_id, state);
 }