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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/watchdog/ixp4xx_wdt.c
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@@ -21,6 +21,7 @@
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 #include <linux/kernel.h>
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 #include <linux/fs.h>
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 #include <linux/miscdevice.h>
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+#include <linux/of.h>
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 #include <linux/watchdog.h>
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 #include <linux/init.h>
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 #include <linux/bitops.h>
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@@ -65,7 +66,7 @@
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 	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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 	wdt_enable();
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-	return nonseekable_open(inode, file);
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+	return stream_open(inode, file);
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 }
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 static ssize_t
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@@ -135,7 +136,7 @@
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 		heartbeat = time;
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 		wdt_enable();
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-		/* Fall through */
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+		fallthrough;
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 	case WDIOC_GETTIMEOUT:
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 		ret = put_user(heartbeat, (int *)arg);
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@@ -162,6 +163,7 @@
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 	.llseek		= no_llseek,
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 	.write		= ixp4xx_wdt_write,
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 	.unlocked_ioctl	= ixp4xx_wdt_ioctl,
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+	.compat_ioctl	= compat_ptr_ioctl,
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 	.open		= ixp4xx_wdt_open,
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 	.release	= ixp4xx_wdt_release,
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 };
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@@ -176,6 +178,14 @@
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 {
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 	int ret;
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+	/*
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+	 * FIXME: we bail out on device tree boot but this really needs
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+	 * to be fixed in a nicer way: this registers the MDIO bus before
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+	 * even matching the driver infrastructure, we should only probe
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+	 * detected hardware.
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+	 */
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+	if (of_have_populated_dt())
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+		return -ENODEV;
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 	if (!(read_cpuid_id() & 0xf) && !cpu_is_ixp46x()) {
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 		pr_err("Rev. A0 IXP42x CPU detected - watchdog disabled\n");
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