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2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/drivers/acpi/reboot.c
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@@ -3,12 +3,37 @@
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 #include <linux/pci.h>
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 #include <linux/acpi.h>
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 #include <acpi/reboot.h>
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+#include <linux/delay.h>
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+
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+#ifdef CONFIG_PCI
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+static void acpi_pci_reboot(struct acpi_generic_address *rr, u8 reset_value)
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+{
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+	unsigned int devfn;
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+	struct pci_bus *bus0;
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+
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+	/* The reset register can only live on bus 0. */
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+	bus0 = pci_find_bus(0, 0);
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+	if (!bus0)
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+		return;
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+	/* Form PCI device/function pair. */
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+	devfn = PCI_DEVFN((rr->address >> 32) & 0xffff,
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+			  (rr->address >> 16) & 0xffff);
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+	pr_debug("Resetting with ACPI PCI RESET_REG.\n");
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+	/* Write the value that resets us. */
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+	pci_bus_write_config_byte(bus0, devfn,
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+			(rr->address & 0xffff), reset_value);
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+}
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+#else
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+static inline void acpi_pci_reboot(struct acpi_generic_address *rr,
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+				   u8 reset_value)
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+{
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+	pr_warn_once("PCI configuration space access is not supported\n");
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+}
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+#endif
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 void acpi_reboot(void)
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 {
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 	struct acpi_generic_address *rr;
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-	struct pci_bus *bus0;
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-	unsigned int devfn;
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 	u8 reset_value;
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38
 
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 	if (acpi_disabled)
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@@ -33,17 +58,7 @@
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 	 * on a device on bus 0. */
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 	switch (rr->space_id) {
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 	case ACPI_ADR_SPACE_PCI_CONFIG:
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-		/* The reset register can only live on bus 0. */
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-		bus0 = pci_find_bus(0, 0);
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-		if (!bus0)
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-			return;
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-		/* Form PCI device/function pair. */
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-		devfn = PCI_DEVFN((rr->address >> 32) & 0xffff,
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-				  (rr->address >> 16) & 0xffff);
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-		printk(KERN_DEBUG "Resetting with ACPI PCI RESET_REG.\n");
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-		/* Write the value that resets us. */
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-		pci_bus_write_config_byte(bus0, devfn,
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-				(rr->address & 0xffff), reset_value);
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+		acpi_pci_reboot(rr, reset_value);
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 		break;
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63
 
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 	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
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@@ -52,4 +67,14 @@
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 		acpi_reset();
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 		break;
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 	}
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+
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+	/*
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+	 * Some platforms do not shut down immediately after writing to the
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+	 * ACPI reset register, and this results in racing with the
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+	 * subsequent reboot mechanism.
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+	 *
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+	 * The 15ms delay has been found to be long enough for the system
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+	 * to reboot on the affected platforms.
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+	 */
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+	mdelay(15);
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 }