diff options
| author |   Juergen Gross <jgross@suse.com> | 2016-10-31 14:58:40 +0100 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2016-11-07 13:55:02 +0100 |
| commit | 9c53a1792a5e6c708897d0cb17f2a4509e499a52 (patch) | |
| tree | 48de24da67c301fcd0eed7cf3af4c2af837e3ba7 /drivers/xen/xenbus/xenbus_xs.c | |
| parent | Linux 4.9-rc4 (diff) | |
| download | linux-dev-9c53a1792a5e6c708897d0cb17f2a4509e499a52.tar.xz linux-dev-9c53a1792a5e6c708897d0cb17f2a4509e499a52.zip | |
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>
Diffstat (limited to 'drivers/xen/xenbus/xenbus_xs.c')
| -rw-r--r-- | drivers/xen/xenbus/xenbus_xs.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c index 22f7cd711c57..99dfdfae42c6 100644 --- a/drivers/xen/xenbus/xenbus_xs.c +++ b/drivers/xen/xenbus/xenbus_xs.c @@ -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, ...) |