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authorMatt Fornero <matt.fornero@mathworks.com>2017-09-05 17:34:10 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2017-09-24 18:58:32 +0300
commit3d62c78a6eb9a7d67bace9622b66ad51e81c5f9b (patch)
tree42f31a81b456cc4ef4958e3f108c3e9407c0e06e /drivers/iio
parent7ee3b7ebcb74714df6d94c8f500f307e1ee5dda5 (diff)
downloadlinux-3d62c78a6eb9a7d67bace9622b66ad51e81c5f9b.tar.xz
iio: core: Return error for failed read_reg
If an IIO device returns an error code for a read access via debugfs, it is currently ignored by the IIO core (other than emitting an error message). Instead, return this error code to user space, so upper layers can detect it correctly. Signed-off-by: Matt Fornero <matt.fornero@mathworks.com> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/industrialio-core.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 17ec4cee51dc..a47428b4d31b 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -310,8 +310,10 @@ static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
ret = indio_dev->info->debugfs_reg_access(indio_dev,
indio_dev->cached_reg_addr,
0, &val);
- if (ret)
+ if (ret) {
dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
+ return ret;
+ }
len = snprintf(buf, sizeof(buf), "0x%X\n", val);