linux-kernel - [PATCH v2 1/2] misc: fastrpc: return -EPIPE to invocations on device removal

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Date:   Mon, 27 Mar 2023 17:02:17 -0400
From:   Richard Acayan <mailingradian@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Amol Maheshwari <amahesh@....qualcomm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Richard Acayan <mailingradian@...il.com>
Subject: [PATCH v2 1/2] misc: fastrpc: return -EPIPE to invocations on device removal

The return value is initialized as -1, or -EPERM. The completion of an
invocation implies that the return value is set appropriately, but
"Permission denied" does not accurately describe the outcome of the
invocation. Set the invocation's return value to a more appropriate
"Broken pipe", as the cleanup breaks the driver's connection with rpmsg.

Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method")
Signed-off-by: Richard Acayan <mailingradian@...il.com>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/misc/fastrpc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index f48466960f1b..20c035af373a 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -2337,8 +2337,10 @@ static void fastrpc_notify_users(struct fastrpc_user *user)
 	struct fastrpc_invoke_ctx *ctx;
 
 	spin_lock(&user->lock);
-	list_for_each_entry(ctx, &user->pending, node)
+	list_for_each_entry(ctx, &user->pending, node) {
+		ctx->retval = -EPIPE;
 		complete(&ctx->work);
+	}
 	spin_unlock(&user->lock);
 }
 
-- 
2.40.0