linux-kernel - [PATCH] optee: don't fail on unsuccessful device enumeration

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Message-Id: <20200513003430.651232-1-vlad.babchuk@gmail.com>
Date:   Wed, 13 May 2020 03:34:30 +0300
From:   Volodymyr Babchuk <vlad.babchuk@...il.com>
To:     Jens Wiklander <jens.wiklander@...aro.org>,
        linux-kernel@...r.kernel.org (open list)
Cc:     Volodymyr Babchuk <vlad.babchuk@...il.com>,
        Volodymyr Babchuk <vlad.babcuk@...il.com>
Subject: [PATCH] optee: don't fail on unsuccessful device enumeration

optee_enumerate_devices() can fail for multiple of reasons. For
example, I encountered issue when Xen OP-TEE mediator NACKed
PTA_CMD_GET_DEVICES call. This should not result in driver
initialization error because this is an optional feature.

Thus, it is better to print warning, instead of termination driver
initialization.

Signed-off-by: Volodymyr Babchuk <vlad.babcuk@...il.com>
---
 drivers/tee/optee/core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index 34409c916882..a053930032f2 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -728,10 +728,8 @@ static int __init optee_driver_init(void)
 		return PTR_ERR(optee);
 
 	rc = optee_enumerate_devices();
-	if (rc) {
-		optee_remove(optee);
-		return rc;
-	}
+	if (rc)
+		pr_warn("can't enumerate optee devices: %d\n", rc);
 
 	pr_info("initialized driver\n");
 
-- 
2.26.2