diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2025-02-03 22:46:29 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2025-02-05 23:09:28 +0300 |
| commit | ab930483eca9f3e816c35824b5868599af0c61d7 (patch) | |
| tree | 2005a163f1bc8172d29f9c84748c044fdc335940 | |
| parent | 2014c95afecee3e76ca4a56956a936e23283f05b (diff) | |
| download | linux-ab930483eca9f3e816c35824b5868599af0c61d7.tar.xz | |
ACPI: property: Fix return value for nval == 0 in acpi_data_prop_read()
While analysing code for software and OF node for the corner case when
caller asks to read zero items in the supposed to be an array of values
I found that ACPI behaves differently to what OF does, i.e.
1. It returns -EINVAL when caller asks to read zero items from integer
array, while OF returns 0, if no other errors happened.
2. It returns -EINVAL when caller asks to read zero items from string
array, while OF returns -ENODATA, if no other errors happened.
Amend ACPI implementation to follow what OF does.
Fixes: b31384fa5de3 ("Driver core: Unified device properties interface for platform firmware")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20250203194629.3731895-1-andriy.shevchenko@linux.intel.com
[ rjw: Added empty line after a conditional ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/property.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c index 98d93ed58315..436019d96027 100644 --- a/drivers/acpi/property.c +++ b/drivers/acpi/property.c @@ -1187,8 +1187,6 @@ static int acpi_data_prop_read(const struct acpi_device_data *data, } break; } - if (nval == 0) - return -EINVAL; if (obj->type == ACPI_TYPE_BUFFER) { if (proptype != DEV_PROP_U8) @@ -1212,9 +1210,11 @@ static int acpi_data_prop_read(const struct acpi_device_data *data, ret = acpi_copy_property_array_uint(items, (u64 *)val, nval); break; case DEV_PROP_STRING: - ret = acpi_copy_property_array_string( - items, (char **)val, - min_t(u32, nval, obj->package.count)); + nval = min_t(u32, nval, obj->package.count); + if (nval == 0) + return -ENODATA; + + ret = acpi_copy_property_array_string(items, (char **)val, nval); break; default: ret = -EINVAL; |