Re: [PATCH v3 11/19] hwmon: (mr75203) add VM pre-scaler support

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On 8/31/2022 3:02 PM, Andy Shevchenko wrote:
On Tue, Aug 30, 2022 at 07:22:04PM +0000, Eliav Farber wrote:
+static int pvt_get_pre_scaler(struct device *dev, struct pvt_device *pvt)
+{
+     const struct device_node *np = dev->of_node;
+     u32 total_channels = pvt->vm_channels.total;
+     u32 channel;
+     u8 *pre_scaler_ch_list;
+     int i, ret, num_ch;
+
+     /* Set default pre-scaler value to be 1. */
+     for (i = 0; i < total_channels; i++)
+             pvt->vd[i].pre_scaler = PRE_SCALER_X1;
+
+     /* Get number of channels configured in "moortec,vm-pre-scaler". */
+     num_ch = of_property_count_u8_elems(np, "moortec,vm-pre-scaler");

of_ ?!

Replaced of_property_count_u8_elems() with
device_property_count_u8().

+     if (num_ch <= 0)
+             return 0;
+
+     pre_scaler_ch_list = kcalloc(total_channels,
+                                  sizeof(*pre_scaler_ch_list), GFP_KERNEL);
+     if (!pre_scaler_ch_list)
+             return -ENOMEM;
+
+     /* Get list of all channels that have pre-scaler of 2. */
+     ret = device_property_read_u8_array(dev, "moortec,vm-pre-scaler",
+                                         pre_scaler_ch_list, num_ch);
+     if (ret)
+             goto out;
+
+     for (i = 0; i < num_ch; i++) {
+             channel = pre_scaler_ch_list[i];

+

Unnecessary blank line.

Blank line removed.


+             if (channel >= total_channels) {
+                     dev_err(dev,
+                             "invalid channel (%u) in pre-scaler list\n",
+                             channel);
+                     ret = -EINVAL;

+                     goto out;

Wouldn't

                       break;

suffice? (I understand the point, up to you)
I prefer to exit the moment I detect a problem.
For now I can use a break but in the future someone else can add new code
in between that will set ret to 0 and instead of failing driver flow will
continue with incomplete pre-scaler value.
So I prefer keeping it as it.

--
Best regards, Eliav



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