[PATCH 06/44] staging: unisys: visorbus: add error handling to toolaction_show

[David Kershner]

Don't just drop the error from visorchannel_read on the floor, report it.

Signed-off-by: David Kershner <david.kershner at unisys.com>
Reviewed-by: Reviewed-by: Tim Sell <timothy.sell at unisys.com>
---
 drivers/staging/unisys/visorbus/visorchipset.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c
index cb8c6f9..543218f 100644
--- a/drivers/staging/unisys/visorbus/visorchipset.c
+++ b/drivers/staging/unisys/visorbus/visorchipset.c
@@ -91,10 +91,15 @@ static ssize_t toolaction_show(struct device *dev,
 			       char *buf)
 {
 	u8 tool_action = 0;
+	int err;
+
+	err = visorchannel_read(chipset_dev->controlvm_channel,
+				offsetof(struct spar_controlvm_channel_protocol,
+					 tool_action),
+				&tool_action, sizeof(u8));
+	if (err)
+		return err;
 
-	visorchannel_read(chipset_dev->controlvm_channel,
-			  offsetof(struct spar_controlvm_channel_protocol,
-				   tool_action), &tool_action, sizeof(u8));
 	return sprintf(buf, "%u\n", tool_action);
 }
 
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