misc: fastrpc: return -EPIPE to invocations on device removal

commit b6a062853ddf6b4f653af2d8b75ba45bb9a036ad upstream.

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")
Cc: stable <stable@kernel.org>
Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230523152550.438363-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 02d2616..b3e5a5d 100644 (file)
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -2149,8 +2149,10 @@ 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);
 }