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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: Juergen Gross <jgross@suse.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Juergen Gross 2016-10-31 14:58:40 +01:00
parent bc33b0ca11
commit 9c53a1792a
2 changed files with 19 additions and 0 deletions
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15
drivers/xen/xenbus/xenbus_xs.c
View File

@ -559,6 +559,21 @@ int xenbus_scanf(struct xenbus_transaction t,
}
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. */
int xenbus_printf(struct xenbus_transaction t,
const char *dir, const char *node, const char *fmt, ...)

4
include/xen/xenbus.h
View File

@ -151,6 +151,10 @@ __scanf(4, 5)
int xenbus_scanf(struct xenbus_transaction t,
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. */
__printf(4, 5)
int xenbus_printf(struct xenbus_transaction t,