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Date: Thu, 8 Sep 2022 15:24:30 +0000 From: Eliav Farber <farbere@...zon.com> To: <jdelvare@...e.com>, <linux@...ck-us.net>, <robh+dt@...nel.org>, <p.zabel@...gutronix.de>, <rtanwar@...linear.com>, <andriy.shevchenko@...el.com>, <linux-hwmon@...r.kernel.org>, <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org> CC: <farbere@...zon.com>, <hhhawa@...zon.com>, <jonnyc@...zon.com>, "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com> Subject: [PATCH v5 02/21] hwmon: (mr75203) fix VM sensor allocation when "intel,vm-map" not defined Bug - in case "intel,vm-map" is missing in device-tree ,'num' is set to 0, and no voltage channel infos are allocated. The reason num is set to 0 when "intel,vm-map" is missing is to set the entire pvt->vm_idx[] with incremental channel numbers, but it didn't take into consideration that same num is used later in devm_kcalloc(). If "intel,vm-map" does exist there is no need to set the unspecified channels with incremental numbers, because the unspecified channels can't be accessed in pvt_read_in() which is the only other place besides the probe functions that uses pvt->vm_idx[]. This change fixes the bug by moving the incremental channel numbers setting to be done only if "intel,vm-map" property is defined (starting loop from 0), and removing 'num = 0'. Fixes: 9d823351a337 ("hwmon: Add hardware monitoring driver for Moortec MR75203 PVT controller") Signed-off-by: Eliav Farber <farbere@...zon.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> --- V4 -> v3: - Simplify the fix by not removing the local num variable (it is removed as part of a later commit). drivers/hwmon/mr75203.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c index 046523d47c29..81ccb4c6fa5c 100644 --- a/drivers/hwmon/mr75203.c +++ b/drivers/hwmon/mr75203.c @@ -594,7 +594,12 @@ static int mr75203_probe(struct platform_device *pdev) ret = device_property_read_u8_array(dev, "intel,vm-map", pvt->vm_idx, vm_num); if (ret) { - num = 0; + /* + * Incase intel,vm-map property is not defined, we + * assume incremental channel numbers. + */ + for (i = 0; i < vm_num; i++) + pvt->vm_idx[i] = i; } else { for (i = 0; i < vm_num; i++) if (pvt->vm_idx[i] >= vm_num || @@ -604,13 +609,6 @@ static int mr75203_probe(struct platform_device *pdev) } } - /* - * Incase intel,vm-map property is not defined, we assume - * incremental channel numbers. - */ - for (i = num; i < vm_num; i++) - pvt->vm_idx[i] = i; - in_config = devm_kcalloc(dev, num + 1, sizeof(*in_config), GFP_KERNEL); if (!in_config) -- 2.37.1
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