svn commit: r284195 - head/sys/dev/acpica

[Jung-uk Kim]

Author: jkim
Date: Tue Jun  9 23:13:37 2015
New Revision: 284195
URL: https://svnweb.freebsd.org/changeset/base/284195

Log:
  Check status of AcpiReadBitRegister() calls.
  
  Reported by:	Coverity
  CID:		1306132

Modified:
  head/sys/dev/acpica/acpi_cpu.c

Modified: head/sys/dev/acpica/acpi_cpu.c
==============================================================================
--- head/sys/dev/acpica/acpi_cpu.c	Tue Jun  9 22:13:53 2015	(r284194)
+++ head/sys/dev/acpica/acpi_cpu.c	Tue Jun  9 23:13:37 2015	(r284195)
@@ -1074,6 +1074,7 @@ acpi_cpu_idle(sbintime_t sbt)
     struct	acpi_cx *cx_next;
     uint64_t	cputicks;
     uint32_t	start_time, end_time;
+    ACPI_STATUS	status;
     int		bm_active, cx_next_idx, i, us;
 
     /*
@@ -1119,8 +1120,8 @@ acpi_cpu_idle(sbintime_t sbt)
      */
     if ((cpu_quirks & CPU_QUIRK_NO_BM_CTRL) == 0 &&
 	cx_next_idx > sc->cpu_non_c3) {
-	AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, &bm_active);
-	if (bm_active != 0) {
+	status = AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, &bm_active);
+	if (ACPI_SUCCESS(status) && bm_active != 0) {
 	    AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, 1);
 	    cx_next_idx = sc->cpu_non_c3;
 	}
@@ -1285,6 +1286,7 @@ acpi_cpu_quirks_piix4(void)
 #ifdef __i386__
     device_t acpi_dev;
     uint32_t val;
+    ACPI_STATUS status;
 
     acpi_dev = pci_find_device(PCI_VENDOR_INTEL, PCI_DEVICE_82371AB_3);
     if (acpi_dev != NULL) {
@@ -1323,8 +1325,8 @@ acpi_cpu_quirks_piix4(void)
 	    	val |= PIIX4_STOP_BREAK_MASK;
 		pci_write_config(acpi_dev, PIIX4_DEVACTB_REG, val, 4);
 	    }
-	    AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_RLD, &val);
-	    if (val) {
+	    status = AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_RLD, &val);
+	    if (ACPI_SUCCESS(status) && val != 0) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 		    "acpi_cpu: PIIX4: reset BRLD_EN_BM\n"));
 		AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 0);