linux-kernel - [PATCH] soc: qcom: qmi: Return EPROBE

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Message-Id: <20191106230511.1290-1-jeffrey.l.hugo@gmail.com>
Date:   Wed,  6 Nov 2019 15:05:11 -0800
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     agross@...nel.org, bjorn.andersson@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Subject: [PATCH] soc: qcom: qmi: Return EPROBE_DEFER if no address family

If a client comes up early in the boot process (perhaps was a built-in
driver), qmi_handle_init() will likely fail with a EAFNOSUPPORT since the
underlying ipc router hasn't init'd and registered the address family.
This should not be a fatal error since chances are, the router will come
up later, so recode the error to EPROBE_DEFER so that clients will retry
later.

Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
---
 drivers/soc/qcom/qmi_interface.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/qmi_interface.c b/drivers/soc/qcom/qmi_interface.c
index f9e309f0acd3..1a03eaa38c46 100644
--- a/drivers/soc/qcom/qmi_interface.c
+++ b/drivers/soc/qcom/qmi_interface.c
@@ -655,8 +655,12 @@ int qmi_handle_init(struct qmi_handle *qmi, size_t recv_buf_size,
 
 	qmi->sock = qmi_sock_create(qmi, &qmi->sq);
 	if (IS_ERR(qmi->sock)) {
-		pr_err("failed to create QMI socket\n");
-		ret = PTR_ERR(qmi->sock);
+		if (PTR_ERR(qmi->sock) == -EAFNOSUPPORT) {
+			ret = -EPROBE_DEFER;
+		} else {
+			pr_err("failed to create QMI socket\n");
+			ret = PTR_ERR(qmi->sock);
+		}
 		goto err_destroy_wq;
 	}
 
-- 
2.17.1