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authorGuenter Roeck <linux@roeck-us.net>2015-12-25 16:01:41 -0800
committerWim Van Sebroeck <wim@iguana.be>2015-12-29 20:36:02 +0100
commite7d162faa6d067777548cb98d55206cf7cd3438e (patch)
treefe4c3c54833ce1f7bc8011b163b536ba49333267 /drivers/watchdog
parent32ecc6392654a0db34b310e8924b5b2c3b8bf503 (diff)
downloadblackbird-op-linux-e7d162faa6d067777548cb98d55206cf7cd3438e.tar.gz
blackbird-op-linux-e7d162faa6d067777548cb98d55206cf7cd3438e.zip
watchdog: diag288: Stop re-using watchdog core internal flags
A watchdog driver should not use watchdog subsystem internal flags. Use a driver variable and flag instead to maintain the watchdog state and to determine if a suspend operation is possible or not. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/diag288_wdt.c26
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/watchdog/diag288_wdt.c b/drivers/watchdog/diag288_wdt.c
index 3db9d0e0673d..861d3d3133f8 100644
--- a/drivers/watchdog/diag288_wdt.c
+++ b/drivers/watchdog/diag288_wdt.c
@@ -106,6 +106,10 @@ static int __diag288_lpar(unsigned int func, unsigned int timeout,
return __diag288(func, timeout, action, 0);
}
+static unsigned long wdt_status;
+
+#define DIAG_WDOG_BUSY 0
+
static int wdt_start(struct watchdog_device *dev)
{
char *ebc_cmd;
@@ -113,12 +117,17 @@ static int wdt_start(struct watchdog_device *dev)
int ret;
unsigned int func;
+ if (test_and_set_bit(DIAG_WDOG_BUSY, &wdt_status))
+ return -EBUSY;
+
ret = -ENODEV;
if (MACHINE_IS_VM) {
ebc_cmd = kmalloc(MAX_CMDLEN, GFP_KERNEL);
- if (!ebc_cmd)
+ if (!ebc_cmd) {
+ clear_bit(DIAG_WDOG_BUSY, &wdt_status);
return -ENOMEM;
+ }
len = strlcpy(ebc_cmd, wdt_cmd, MAX_CMDLEN);
ASCEBC(ebc_cmd, MAX_CMDLEN);
EBC_TOUPPER(ebc_cmd, MAX_CMDLEN);
@@ -135,6 +144,7 @@ static int wdt_start(struct watchdog_device *dev)
if (ret) {
pr_err("The watchdog cannot be activated\n");
+ clear_bit(DIAG_WDOG_BUSY, &wdt_status);
return ret;
}
return 0;
@@ -146,6 +156,9 @@ static int wdt_stop(struct watchdog_device *dev)
diag_stat_inc(DIAG_STAT_X288);
ret = __diag288(WDT_FUNC_CANCEL, 0, 0, 0);
+
+ clear_bit(DIAG_WDOG_BUSY, &wdt_status);
+
return ret;
}
@@ -220,17 +233,10 @@ static struct watchdog_device wdt_dev = {
* It makes no sense to go into suspend while the watchdog is running.
* Depending on the memory size, the watchdog might trigger, while we
* are still saving the memory.
- * We reuse the open flag to ensure that suspend and watchdog open are
- * exclusive operations
*/
static int wdt_suspend(void)
{
- if (test_and_set_bit(WDOG_DEV_OPEN, &wdt_dev.status)) {
- pr_err("Linux cannot be suspended while the watchdog is in use\n");
- return notifier_from_errno(-EBUSY);
- }
- if (test_bit(WDOG_ACTIVE, &wdt_dev.status)) {
- clear_bit(WDOG_DEV_OPEN, &wdt_dev.status);
+ if (test_and_set_bit(DIAG_WDOG_BUSY, &wdt_status)) {
pr_err("Linux cannot be suspended while the watchdog is in use\n");
return notifier_from_errno(-EBUSY);
}
@@ -239,7 +245,7 @@ static int wdt_suspend(void)
static int wdt_resume(void)
{
- clear_bit(WDOG_DEV_OPEN, &wdt_dev.status);
+ clear_bit(DIAG_WDOG_BUSY, &wdt_status);
return NOTIFY_DONE;
}
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