This is a note to let you know that I've just added the patch titled
hwmon: (ltc2947) Properly handle errors when looking for the external clock
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hwmon-ltc2947-properly-handle-errors-when-looking-fo.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6567f320895c3219946e412b5dc6a030b94ee344
Author: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Date: Thu Sep 23 22:11:13 2021 +0200
hwmon: (ltc2947) Properly handle errors when looking for the external clock
[ Upstream commit 6f7d70467121f790b36af2d84bc02b5c236bf5e6 ]
The return value of devm_clk_get should in general be propagated to
upper layer. In this case the clk is optional, use the appropriate
wrapper instead of interpreting all errors as "The optional clk is not
available".
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210923201113.398932-1-u.kleine-koenig@xxxxxxxxxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/hwmon/ltc2947-core.c b/drivers/hwmon/ltc2947-core.c
index bb3f7749a0b0..5423466de697 100644
--- a/drivers/hwmon/ltc2947-core.c
+++ b/drivers/hwmon/ltc2947-core.c
@@ -989,8 +989,12 @@ static int ltc2947_setup(struct ltc2947_data *st)
return ret;
/* check external clock presence */
- extclk = devm_clk_get(st->dev, NULL);
- if (!IS_ERR(extclk)) {
+ extclk = devm_clk_get_optional(st->dev, NULL);
+ if (IS_ERR(extclk))
+ return dev_err_probe(st->dev, PTR_ERR(extclk),
+ "Failed to get external clock\n");
+
+ if (extclk) {
unsigned long rate_hz;
u8 pre = 0, div, tbctl;
u64 aux;
