staging: unisys: visorbus: add error handling to boottotool_show

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

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c
index 543218f..00fd02f 100644 (file)
--- a/drivers/staging/unisys/visorbus/visorchipset.c
+++ b/drivers/staging/unisys/visorbus/visorchipset.c
@@ -130,11 +130,16 @@ static ssize_t boottotool_show(struct device *dev,
                               char *buf)
 {
        struct efi_spar_indication efi_spar_indication;
+       int err;
 
-       visorchannel_read(chipset_dev->controlvm_channel,
-                         offsetof(struct spar_controlvm_channel_protocol,
-                                  efi_spar_ind), &efi_spar_indication,
-                         sizeof(struct efi_spar_indication));
+       err = visorchannel_read(chipset_dev->controlvm_channel,
+                               offsetof(struct spar_controlvm_channel_protocol,
+                                        efi_spar_ind),
+                               &efi_spar_indication,
+                               sizeof(struct efi_spar_indication));
+
+       if (err)
+               return err;
        return sprintf(buf, "%u\n", efi_spar_indication.boot_to_tool);
 }