watchdog: add CONFIG_WATCHDOG_NOWAYOUT support to PowerPC Book-E watchdog driver

Normally, the watchdog is disabled when dev/watchdog is closed, but if
CONFIG_WATCHDOG_NOWAYOUT is defined, then it means that the watchdog should
remain enabled.  So we should disable it only if CONFIG_WATCHDOG_NOWAYOUT is
not defined.

Also ensure that /dev/watchdog is only opened by one process at a time.  That
way, a second process can't accidentally disable the watchdog while the first
process has it open.  There shouldn't be any need for more than one process to
open /dev/watchdog anyway.

Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c
index d11ffb0..636e013 100644 (file)
--- a/drivers/watchdog/booke_wdt.c
+++ b/drivers/watchdog/booke_wdt.c
@@ -193,8 +193,15 @@ static long booke_wdt_ioctl(struct file *file,
        return 0;
 }
 
+/* wdt_is_active stores wether or not the /dev/watchdog device is opened */
+static unsigned long wdt_is_active;
+
 static int booke_wdt_open(struct inode *inode, struct file *file)
 {
+       /* /dev/watchdog can only be opened once */
+       if (test_and_set_bit(0, &wdt_is_active))
+               return -EBUSY;
+
        spin_lock(&booke_wdt_lock);
        if (booke_wdt_enabled == 0) {
                booke_wdt_enabled = 1;
@@ -210,8 +217,17 @@ static int booke_wdt_open(struct inode *inode, struct file *file)
 
 static int booke_wdt_release(struct inode *inode, struct file *file)
 {
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+       /* Normally, the watchdog is disabled when /dev/watchdog is closed, but
+        * if CONFIG_WATCHDOG_NOWAYOUT is defined, then it means that the
+        * watchdog should remain enabled.  So we disable it only if
+        * CONFIG_WATCHDOG_NOWAYOUT is not defined.
+        */
        on_each_cpu(__booke_wdt_disable, NULL, 0);
        booke_wdt_enabled = 0;
+#endif
+
+       clear_bit(0, &wdt_is_active);
 
        return 0;
 }