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

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

drivers/xen/xenbus/xenbus_xs.c

+15 −0
Original line number Original line Diff line number Diff line
@@ -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, ...)

include/xen/xenbus.h

+4 −0
Original line number Original line Diff line number Diff line
@@ -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,