[PATCH 5.10 183/699] clk: scmi: Fix clock rate rounding

5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Cristian Marussi <[email protected]>

[ Upstream commit d0c81a38d06d446d341532700b3a4a43d3b00eb1 ]

While the do_div() helper used for rounding expects its divisor argument
to be a 32bits quantity, the currently provided divisor parameter is a
64bit value that, as a consequence, is silently truncated and a possible
source of bugs.

Fix by using the proper div64_ul helper.

Cc: Michael Turquette <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: [email protected]
Fixes: 7a8655e19bdb ("clk: scmi: Fix the rounding of clock rate")
Signed-off-by: Cristian Marussi <[email protected]>
Tested-by: Florian Fainelli <[email protected]>
Tested-by: Geert Uytterhoeven <[email protected]>
Link: https://patch.msgid.link/[email protected]
Reviewed-by: Brian Masney <[email protected]>
Signed-off-by: Sudeep Holla <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
 drivers/clk/clk-scmi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c
index c62636fb4aca8d..659f26d839eb5b 100644
--- a/drivers/clk/clk-scmi.c
+++ b/drivers/clk/clk-scmi.c
@@ -9,9 +9,9 @@
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/of.h>
+#include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/scmi_protocol.h>
-#include <asm/div64.h>
 
 struct scmi_clk {
 	u32 id;
@@ -59,7 +59,7 @@ static long scmi_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	ftmp = rate - fmin;
 	ftmp += clk->info->range.step_size - 1; /* to round up */
-	do_div(ftmp, clk->info->range.step_size);
+	ftmp = div64_ul(ftmp, clk->info->range.step_size);
 
 	return ftmp * clk->info->range.step_size + fmin;
 }
-- 
2.53.0