Commit 9c53a179 authored by Juergen Gross's avatar Juergen Gross

xen: introduce xenbus_read_unsigned()

There are multiple instances of code reading an optional unsigned
parameter from Xenstore via xenbus_scanf(). Instead of repeating the
same code over and over add a service function doing the job.
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent bc33b0ca
...@@ -559,6 +559,21 @@ int xenbus_scanf(struct xenbus_transaction t, ...@@ -559,6 +559,21 @@ int xenbus_scanf(struct xenbus_transaction t,
} }
EXPORT_SYMBOL_GPL(xenbus_scanf); EXPORT_SYMBOL_GPL(xenbus_scanf);
/* Read an (optional) unsigned value. */
unsigned int xenbus_read_unsigned(const char *dir, const char *node,
unsigned int default_val)
{
unsigned int val;
int ret;
ret = xenbus_scanf(XBT_NIL, dir, node, "%u", &val);
if (ret <= 0)
val = default_val;
return val;
}
EXPORT_SYMBOL_GPL(xenbus_read_unsigned);
/* Single printf and write: returns -errno or 0. */ /* Single printf and write: returns -errno or 0. */
int xenbus_printf(struct xenbus_transaction t, int xenbus_printf(struct xenbus_transaction t,
const char *dir, const char *node, const char *fmt, ...) const char *dir, const char *node, const char *fmt, ...)
......
...@@ -151,6 +151,10 @@ __scanf(4, 5) ...@@ -151,6 +151,10 @@ __scanf(4, 5)
int xenbus_scanf(struct xenbus_transaction t, int xenbus_scanf(struct xenbus_transaction t,
const char *dir, const char *node, const char *fmt, ...); const char *dir, const char *node, const char *fmt, ...);
/* Read an (optional) unsigned value. */
unsigned int xenbus_read_unsigned(const char *dir, const char *node,
unsigned int default_val);
/* Single printf and write: returns -errno or 0. */ /* Single printf and write: returns -errno or 0. */
__printf(4, 5) __printf(4, 5)
int xenbus_printf(struct xenbus_transaction t, int xenbus_printf(struct xenbus_transaction t,
......
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