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HID: logitech-hidpp: fix negated returns
Reported by Dan Carpenter: drivers/hid/hid-logitech-hidpp.c:359 hidpp_root_get_protocol_version() warn: should this return really be negated? drivers/hid/hid-logitech-hidpp.c:398 hidpp_devicenametype_get_count() warn: should this return really be negated? drivers/hid/hid-logitech-hidpp.c:417 hidpp_devicenametype_get_device_name() warn: should this return really be negated? drivers/hid/hid-logitech-hidpp.c:524 hidpp_touchpad_get_raw_info() warn: should this return really be negated? The problem lies in hidpp_send_message_sync() which can return 2 types of errors depending of their sign. Adding a comment there to clarify what is happening. To solve that, print an error in case of a protocol problem, and raise -EPROTO instead. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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@ -151,6 +151,14 @@ static int __hidpp_send_report(struct hid_device *hdev,
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return ret == fields_count ? 0 : -1;
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}
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/**
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* hidpp_send_message_sync() returns 0 in case of success, and something else
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* in case of a failure.
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* - If ' something else' is positive, that means that an error has been raised
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* by the protocol itself.
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* - If ' something else' is negative, that means that we had a classic error
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* (-ENOMEM, -EPIPE, etc...)
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*/
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static int hidpp_send_message_sync(struct hidpp_device *hidpp,
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struct hidpp_report *message,
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struct hidpp_report *response)
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@ -359,8 +367,13 @@ static int hidpp_root_get_protocol_version(struct hidpp_device *hidpp)
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return 0;
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}
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if (ret > 0) {
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hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
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__func__, ret);
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return -EPROTO;
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}
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if (ret)
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return -ret;
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return ret;
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hidpp->protocol_major = response.fap.params[0];
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hidpp->protocol_minor = response.fap.params[1];
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@ -398,8 +411,13 @@ static int hidpp_devicenametype_get_count(struct hidpp_device *hidpp,
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ret = hidpp_send_fap_command_sync(hidpp, feature_index,
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CMD_GET_DEVICE_NAME_TYPE_GET_COUNT, NULL, 0, &response);
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if (ret > 0) {
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hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
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__func__, ret);
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return -EPROTO;
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}
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if (ret)
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return -ret;
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return ret;
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*nameLength = response.fap.params[0];
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@ -417,8 +435,13 @@ static int hidpp_devicenametype_get_device_name(struct hidpp_device *hidpp,
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CMD_GET_DEVICE_NAME_TYPE_GET_DEVICE_NAME, &char_index, 1,
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&response);
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if (ret > 0) {
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hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
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__func__, ret);
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return -EPROTO;
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}
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if (ret)
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return -ret;
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return ret;
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if (response.report_id == REPORT_ID_HIDPP_LONG)
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count = HIDPP_REPORT_LONG_LENGTH - 4;
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@ -524,8 +547,13 @@ static int hidpp_touchpad_get_raw_info(struct hidpp_device *hidpp,
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ret = hidpp_send_fap_command_sync(hidpp, feature_index,
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CMD_TOUCHPAD_GET_RAW_INFO, NULL, 0, &response);
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if (ret > 0) {
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hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
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__func__, ret);
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return -EPROTO;
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}
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if (ret)
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return -ret;
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return ret;
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raw_info->x_size = get_unaligned_be16(¶ms[0]);
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raw_info->y_size = get_unaligned_be16(¶ms[2]);
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