linux-kernel - [PATCH] watchdog docs: Fix use of WDIOC

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Date:	Mon, 5 Apr 2010 11:31:29 +0100
From:	James Hogan <james@...anarts.com>
To:	Wim Van Sebroeck <wim@...ana.be>,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Trevor Keith <tsrk@...k.net>,
	James Hogan <james.hogan@...tec.com>,
	Ladinu Chandrasinghe <ladinu.pub@...il.com>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH] watchdog docs: Fix use of WDIOC_SETOPTIONS ioctl.

In the watchdog-test program and watchdog-api.txt, pass the values to
the WDIOC_SETOPTIONS ioctl as a pointer to an integer containing the
values intead of directly in the third ioctl argument. The actual
watchdog drivers in drivers/watchdog don't read the options directly
from the argument but use get_user and copy_from_user.

Signed-off-by: James Hogan <james.hogan@...tec.com>
---
 Documentation/watchdog/src/watchdog-test.c |    8 ++++++--
 Documentation/watchdog/watchdog-api.txt    |    5 ++---
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/Documentation/watchdog/src/watchdog-test.c
b/Documentation/watchdog/src/watchdog-test.c
index a750532..63fdc34 100644
--- a/Documentation/watchdog/src/watchdog-test.c
+++ b/Documentation/watchdog/src/watchdog-test.c
@@ -31,6 +31,8 @@ static void keep_alive(void)
  */
 int main(int argc, char *argv[])
 {
+    int flags;
+
     fd = open("/dev/watchdog", O_WRONLY);

     if (fd == -1) {
@@ -41,12 +43,14 @@ int main(int argc, char *argv[])

     if (argc > 1) {
 	if (!strncasecmp(argv[1], "-d", 2)) {
-	    ioctl(fd, WDIOC_SETOPTIONS, WDIOS_DISABLECARD);
+	    flags = WDIOS_DISABLECARD;
+	    ioctl(fd, WDIOC_SETOPTIONS, &flags);
 	    fprintf(stderr, "Watchdog card disabled.\n");
 	    fflush(stderr);
 	    exit(0);
 	} else if (!strncasecmp(argv[1], "-e", 2)) {
-	    ioctl(fd, WDIOC_SETOPTIONS, WDIOS_ENABLECARD);
+	    flags = WDIOS_ENABLECARD;
+	    ioctl(fd, WDIOC_SETOPTIONS, &flags);
 	    fprintf(stderr, "Watchdog card enabled.\n");
 	    fflush(stderr);
 	    exit(0);
diff --git a/Documentation/watchdog/watchdog-api.txt
b/Documentation/watchdog/watchdog-api.txt
index 4cc4ba9..eb7132e 100644
--- a/Documentation/watchdog/watchdog-api.txt
+++ b/Documentation/watchdog/watchdog-api.txt
@@ -222,11 +222,10 @@ returned value is the temperature in degrees fahrenheit.
     ioctl(fd, WDIOC_GETTEMP, &temperature);

 Finally the SETOPTIONS ioctl can be used to control some aspects of
-the cards operation; right now the pcwd driver is the only one
-supporting this ioctl.
+the cards operation.

     int options = 0;
-    ioctl(fd, WDIOC_SETOPTIONS, options);
+    ioctl(fd, WDIOC_SETOPTIONS, &options);

 The following options are available:

-- 
1.6.6.1
--
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