linux-kernel - [PATCH AUTOSEL 5.3 79/87] clk: Make clk_bulk_get

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Date:   Tue, 24 Sep 2019 12:41:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Dong Aisheng <aisheng.dong@....com>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-clk@...r.kernel.org
Subject: [PATCH AUTOSEL 5.3 79/87] clk: Make clk_bulk_get_all() return a valid "id"

From: Bjorn Andersson <bjorn.andersson@...aro.org>

[ Upstream commit 7f81c2426587b34bf73e643c1a6d080dfa14cf8a ]

The adreno driver expects the "id" field of the returned clk_bulk_data
to be filled in with strings from the clock-names property.

But due to the use of kmalloc_array() in of_clk_bulk_get_all() it
receives a list of bogus pointers instead.

Zero-initialize the "id" field and attempt to populate with strings from
the clock-names property to resolve both these issues.

Fixes: 616e45df7c4a ("clk: add new APIs to operate on all available clocks")
Fixes: 8e3e791d20d2 ("drm/msm: Use generic bulk clock function")
Cc: Dong Aisheng <aisheng.dong@....com>
Cc: Jordan Crouse <jcrouse@...eaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Link: https://lkml.kernel.org/r/20190913024029.2640-1-bjorn.andersson@linaro.org
Reviewed-by: Jordan Crouse <jcrouse@...eaurora.org>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/clk-bulk.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
index 524bf9a530985..e9e16425c739c 100644
--- a/drivers/clk/clk-bulk.c
+++ b/drivers/clk/clk-bulk.c
@@ -18,10 +18,13 @@ static int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
 	int ret;
 	int i;
 
-	for (i = 0; i < num_clks; i++)
+	for (i = 0; i < num_clks; i++) {
+		clks[i].id = NULL;
 		clks[i].clk = NULL;
+	}
 
 	for (i = 0; i < num_clks; i++) {
+		of_property_read_string_index(np, "clock-names", i, &clks[i].id);
 		clks[i].clk = of_clk_get(np, i);
 		if (IS_ERR(clks[i].clk)) {
 			ret = PTR_ERR(clks[i].clk);
-- 
2.20.1