linux-kernel - [PATCH 2/4] clk: tegra: check BPMP response return code

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Message-ID: <6a69e270519fd1c7a12a335053bf59671abc3c4b.1504776489.git.talho@nvidia.com>
Date:   Thu, 7 Sep 2017 12:31:02 +0300
From:   Timo Alho <talho@...dia.com>
To:     <thierry.reding@...il.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Timo Alho <talho@...dia.com>
Subject: [PATCH 2/4] clk: tegra: check BPMP response return code

Check return code in BPMP response message(s). The typical error case
is when clock operation is attempted with invalid clock identifier.

Also remove error print from call to clk_get_info() as the
implementation loops through range of all possible identifier, but the
operation is expected error out when the clock id is unused.

Signed-off-by: Timo Alho <talho@...dia.com>
---
 drivers/clk/tegra/clk-bpmp.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/tegra/clk-bpmp.c b/drivers/clk/tegra/clk-bpmp.c
index 638ace6..a896692 100644
--- a/drivers/clk/tegra/clk-bpmp.c
+++ b/drivers/clk/tegra/clk-bpmp.c
@@ -55,6 +55,7 @@ struct tegra_bpmp_clk_message {
 	struct {
 		void *data;
 		size_t size;
+		int ret;
 	} rx;
 };
 
@@ -64,6 +65,7 @@ static int tegra_bpmp_clk_transfer(struct tegra_bpmp *bpmp,
 	struct mrq_clk_request request;
 	struct tegra_bpmp_message msg;
 	void *req = &request;
+	int err;
 
 	memset(&request, 0, sizeof(request));
 	request.cmd_and_id = (clk->cmd << 24) | clk->id;
@@ -84,7 +86,13 @@ static int tegra_bpmp_clk_transfer(struct tegra_bpmp *bpmp,
 	msg.rx.data = clk->rx.data;
 	msg.rx.size = clk->rx.size;
 
-	return tegra_bpmp_transfer(bpmp, &msg);
+	err = tegra_bpmp_transfer(bpmp, &msg);
+	if (err < 0)
+		return err;
+	else if (msg.rx.ret < 0)
+		return -EINVAL;
+
+	return 0;
 }
 
 static int tegra_bpmp_clk_prepare(struct clk_hw *hw)
@@ -414,11 +422,8 @@ static int tegra_bpmp_probe_clocks(struct tegra_bpmp *bpmp,
 		struct tegra_bpmp_clk_info *info = &clocks[count];
 
 		err = tegra_bpmp_clk_get_info(bpmp, id, info);
-		if (err < 0) {
-			dev_err(bpmp->dev, "failed to query clock %u: %d\n",
-				id, err);
+		if (err < 0)
 			continue;
-		}
 
 		if (info->num_parents >= U8_MAX) {
 			dev_err(bpmp->dev,
-- 
2.7.4