ata: libata-scsi: fix ata_dsm_trim_pages() kernel-docgrafted

make htmldocs fails with:

  Documentation/driver-api/libata:604: ./drivers/ata/libata-scsi.c:2301:
  ERROR: Unexpected indentation. [docutils]

The Return: section of ata_dsm_trim_pages() ends its first sentence with
a colon and continues with an indented bullet list. reStructuredText
requires a blank line before an indented block, so docutils chokes on
the list.

Simply adding the missing blank line does not work either: Return: is a
kernel-doc "special section", which is terminated by the first blank
line, so the bullet list would end up in the Description section,
detached from the sentence introducing it.

Spell the two bounds out as prose instead, so that the Return: section
stays self-contained. Documentation-only change.

Fixes: e64e6b5dc867 ("ata: libata-scsi: scale DSM TRIM payload by MAX PAGES PER DSM COMMAND")
Reported-by: Thomas Huth <thuth@redhat.com>
Closes: https://lore.kernel.org/linux-ide/b0a0b8e8-cc4f-4c7b-8bc5-fee0712d405a@redhat.com/
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20260916130031.29990-2-cassel@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>

1 files changed, 82 insertions, 0 deletions

diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c
new file mode 100644
index 000000000..b79b7c99c
--- /dev/null
+++ b/drivers/acpi/reboot.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define pr_fmt(fmt) "ACPI: " fmt
+
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <acpi/reboot.h>
+#include <linux/delay.h>
+
+#ifdef CONFIG_PCI
+static void acpi_pci_reboot(struct acpi_generic_address *rr, u8 reset_value)
+{
+	unsigned int devfn;
+	struct pci_bus *bus0;
+
+	/* The reset register can only live on bus 0. */
+	bus0 = pci_find_bus(0, 0);
+	if (!bus0)
+		return;
+	/* Form PCI device/function pair. */
+	devfn = PCI_DEVFN((rr->address >> 32) & 0xffff,
+			  (rr->address >> 16) & 0xffff);
+	pr_debug("Resetting with ACPI PCI RESET_REG.\n");
+	/* Write the value that resets us. */
+	pci_bus_write_config_byte(bus0, devfn,
+			(rr->address & 0xffff), reset_value);
+}
+#else
+static inline void acpi_pci_reboot(struct acpi_generic_address *rr,
+				   u8 reset_value)
+{
+	pr_warn_once("PCI configuration space access is not supported\n");
+}
+#endif
+
+void acpi_reboot(void)
+{
+	struct acpi_generic_address *rr;
+	u8 reset_value;
+
+	if (acpi_disabled)
+		return;
+
+	rr = &acpi_gbl_FADT.reset_register;
+
+	/* ACPI reset register was only introduced with v2 of the FADT */
+
+	if (acpi_gbl_FADT.header.revision < 2)
+		return;
+
+	/* Is the reset register supported? The spec says we should be
+	 * checking the bit width and bit offset, but Windows ignores
+	 * these fields */
+	if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER))
+		return;
+
+	reset_value = acpi_gbl_FADT.reset_value;
+
+	/* The reset register can only exist in I/O, Memory or PCI config space
+	 * on a device on bus 0. */
+	switch (rr->space_id) {
+	case ACPI_ADR_SPACE_PCI_CONFIG:
+		acpi_pci_reboot(rr, reset_value);
+		break;
+
+	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+	case ACPI_ADR_SPACE_SYSTEM_IO:
+		pr_debug("ACPI MEMORY or I/O RESET_REG.\n");
+		acpi_reset();
+		break;
+	}
+
+	/*
+	 * Some platforms do not shut down immediately after writing to the
+	 * ACPI reset register, and this results in racing with the
+	 * subsequent reboot mechanism.
+	 *
+	 * The 15ms delay has been found to be long enough for the system
+	 * to reboot on the affected platforms.
+	 */
+	mdelay(15);
+}