[PATCH v8 3/8] qdev-properties: blocksize: use same limits in code and description

[Roman Kagan <rvkagan@yandex-team.ru>]

Make it easier (more visible) to maintain the limits on the blocksize
properties in sync with the respective description, by using macros both
in the code and in the description.

Signed-off-by: Roman Kagan <rvkagan@yandex-team.ru>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 hw/core/qdev-properties.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index cc924815da..249dc69bd8 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -729,6 +729,13 @@ const PropertyInfo qdev_prop_pci_devfn = {
 
 /* --- blocksize --- */
 
+/* lower limit is sector size */
+#define MIN_BLOCK_SIZE          512
+#define MIN_BLOCK_SIZE_STR      stringify(MIN_BLOCK_SIZE)
+/* upper limit is the max power of 2 that fits in uint16_t */
+#define MAX_BLOCK_SIZE          32768
+#define MAX_BLOCK_SIZE_STR      stringify(MAX_BLOCK_SIZE)
+
 static void set_blocksize(Object *obj, Visitor *v, const char *name,
                           void *opaque, Error **errp)
 {
@@ -736,8 +743,6 @@ static void set_blocksize(Object *obj, Visitor *v, const char *name,
     Property *prop = opaque;
     uint16_t value, *ptr = qdev_get_prop_ptr(dev, prop);
     Error *local_err = NULL;
-    const int64_t min = 512;
-    const int64_t max = 32768;
 
     if (dev->realized) {
         qdev_prop_set_after_realize(dev, name, errp);
@@ -750,9 +755,12 @@ static void set_blocksize(Object *obj, Visitor *v, const char *name,
         return;
     }
     /* value of 0 means "unset" */
-    if (value && (value < min || value > max)) {
-        error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE,
-                   dev->id ? : "", name, (int64_t)value, min, max);
+    if (value && (value < MIN_BLOCK_SIZE || value > MAX_BLOCK_SIZE)) {
+        error_setg(errp,
+                   "Property %s.%s doesn't take value %" PRIu16
+                   " (minimum: " MIN_BLOCK_SIZE_STR
+                   ", maximum: " MAX_BLOCK_SIZE_STR ")",
+                   dev->id ? : "", name, value);
         return;
     }
 
@@ -769,7 +777,8 @@ static void set_blocksize(Object *obj, Visitor *v, const char *name,
 
 const PropertyInfo qdev_prop_blocksize = {
     .name  = "uint16",
-    .description = "A power of two between 512 and 32768",
+    .description = "A power of two between " MIN_BLOCK_SIZE_STR
+                   " and " MAX_BLOCK_SIZE_STR,
     .get   = get_uint16,
     .set   = set_blocksize,
     .set_default_value = set_default_value_uint,
-- 
2.26.2