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authorStephen Boyd <swboyd@chromium.org>2018-05-30 23:23:43 -0700
committerLee Jones <lee.jones@linaro.org>2018-06-04 08:46:42 +0100
commitdf7c3bf24f546ab0e5a23b282d34850f2b8eb0d2 (patch)
tree192125f20a87641b62b06a7be33fc7e14115f78f /drivers/mfd
parent3aa2177e47878f7e7616da8a2050c44f22301b6e (diff)
mfd: cros_ec_dev: Don't advertise junk features on failure
If the feature query fails during this driver's probe, we memset the features bits to 0, but then we continue to overwrite that with whatever junk we read back when the feature probing failed. In the case of a SPI device, it may be complete junk, causing the caller of this function to think certain features are present when they aren't. Don't copy over the bad message on failure so we can fail more gracefully. Fixes: e4244ebddae2 ("platform/chrome: Introduce a new function to check EC features.") Signed-off-by: Stephen Boyd <swboyd@chromium.org> Acked-by: Benson Leung <bleung@chromium.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/cros_ec_dev.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index 81466264f7fc..dfc9f131aabe 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -113,10 +113,10 @@ static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
dev_warn(ec->dev, "cannot get EC features: %d/%d\n",
ret, msg->result);
memset(ec->features, 0, sizeof(ec->features));
+ } else {
+ memcpy(ec->features, msg->data, sizeof(ec->features));
}
- memcpy(ec->features, msg->data, sizeof(ec->features));
-
dev_dbg(ec->dev, "EC features %08x %08x\n",
ec->features[0], ec->features[1]);