ACPI / watchdog: Fix off-by-one error at resource assignment

commit b1abf6fc49829d89660c961fafe3f90f3d843c55 upstream.

The resource allocation in WDAT watchdog has off-one-by error, it sets
one byte more than the actual end address.  This may eventually lead
to unexpected resource conflicts.

Fixes: 058dfc767008 (ACPI / watchdog: Add support for WDAT hardware watchdog)
Cc: 4.9+ <stable@vger.kernel.org> # 4.9+
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c
index 11b113f..ebb626f 100644 (file)
--- a/drivers/acpi/acpi_watchdog.c
+++ b/drivers/acpi/acpi_watchdog.c
@@ -74,10 +74,10 @@ void __init acpi_watchdog_init(void)
                res.start = gas->address;
                if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
                        res.flags = IORESOURCE_MEM;
-                       res.end = res.start + ALIGN(gas->access_width, 4);
+                       res.end = res.start + ALIGN(gas->access_width, 4) - 1;
                } else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
                        res.flags = IORESOURCE_IO;
-                       res.end = res.start + gas->access_width;
+                       res.end = res.start + gas->access_width - 1;
                } else {
                        pr_warn("Unsupported address space: %u\n",
                                gas->space_id);

diff --git a/drivers/watchdog/wdat_wdt.c b/drivers/watchdog/wdat_wdt.c
index 6d1fbda..0da9943 100644 (file)
--- a/drivers/watchdog/wdat_wdt.c
+++ b/drivers/watchdog/wdat_wdt.c
@@ -392,7 +392,7 @@ static int wdat_wdt_probe(struct platform_device *pdev)
 
                memset(&r, 0, sizeof(r));
                r.start = gas->address;
-               r.end = r.start + gas->access_width;
+               r.end = r.start + gas->access_width - 1;
                if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
                        r.flags = IORESOURCE_MEM;
                } else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {