修改GPIO导出默认初始值

hc

2024-10-16 50a212ec906f7524620675f0c57357691c26c81f

 kernel/drivers/watchdog/iTCO_wdt.c
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@@ -426,6 +426,20 @@
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 	return time_left;
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 }
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+/* Returns true if the watchdog was running */
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+static bool iTCO_wdt_set_running(struct iTCO_wdt_private *p)
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+{
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+	u16 val;
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+
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+	/* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled */
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+	val = inw(TCO1_CNT(p));
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+	if (!(val & BIT(11))) {
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+		set_bit(WDOG_HW_RUNNING, &p->wddev.status);
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+		return true;
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+	}
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+	return false;
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+}
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+
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 /*
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  *	Kernel Interfaces
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  */
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@@ -514,9 +528,6 @@
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 		return -ENODEV;	/* Cannot reset NO_REBOOT bit */
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 	}
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-	/* Set the NO_REBOOT bit to prevent later reboots, just for sure */
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-	p->update_no_reboot_bit(p->no_reboot_priv, true);
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-
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 	if (turn_SMI_watchdog_clear_off >= p->iTCO_version) {
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 		/*
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 		 * Bit 13: TCO_EN -> 0
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@@ -568,8 +579,13 @@
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 	watchdog_set_drvdata(&p->wddev, p);
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 	platform_set_drvdata(pdev, p);
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-	/* Make sure the watchdog is not running */
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-	iTCO_wdt_stop(&p->wddev);
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+	if (!iTCO_wdt_set_running(p)) {
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+		/*
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+		 * If the watchdog was not running set NO_REBOOT now to
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+		 * prevent later reboots.
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+		 */
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+		p->update_no_reboot_bit(p->no_reboot_priv, true);
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+	}
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 	/* Check that the heartbeat value is within it's range;
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 	   if not reset to the default */