[PATCH 4.17 267/336] staging: ks7010: fix error handling in ks7010_upload_firmware

[Greg Kroah-Hartman]

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx>

[ Upstream commit 6e043704fb99e3e1d7a1bb02030e49c093cdd943 ]

This commit checks missing error code check when checking
if the firmware is running reading General Communication
Register A (GCR_A).

It also set ret to EBUSY if firmware is running before
copying it.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx>
Reviewed-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/staging/ks7010/ks7010_sdio.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/staging/ks7010/ks7010_sdio.c
+++ b/drivers/staging/ks7010/ks7010_sdio.c
@@ -657,8 +657,11 @@ static int ks7010_upload_firmware(struct
 
 	/* Firmware running ? */
 	ret = ks7010_sdio_readb(priv, GCR_A, &byte);
+	if (ret)
+		goto release_host_and_free;
 	if (byte == GCR_A_RUN) {
 		netdev_dbg(priv->net_dev, "MAC firmware running ...\n");
+		ret = -EBUSY;
 		goto release_host_and_free;
 	}