xen/xenbus: don't reimplement kvasprintf via a fixed size buffer
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Haogang Chen <haogangchen@gmail.com>
Acked-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index 6f0121e..226d1ac 100644
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -532,21 +532,18 @@
{
va_list ap;
int ret;
-#define PRINTF_BUFFER_SIZE 4096
- char *printf_buffer;
-
- printf_buffer = kmalloc(PRINTF_BUFFER_SIZE, GFP_NOIO | __GFP_HIGH);
- if (printf_buffer == NULL)
- return -ENOMEM;
+ char *buf;
va_start(ap, fmt);
- ret = vsnprintf(printf_buffer, PRINTF_BUFFER_SIZE, fmt, ap);
+ buf = kvasprintf(GFP_NOIO | __GFP_HIGH, fmt, ap);
va_end(ap);
- BUG_ON(ret > PRINTF_BUFFER_SIZE-1);
- ret = xenbus_write(t, dir, node, printf_buffer);
+ if (!buf)
+ return -ENOMEM;
- kfree(printf_buffer);
+ ret = xenbus_write(t, dir, node, buf);
+
+ kfree(buf);
return ret;
}