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- Consistently protect against NULL dereference.

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- Simplify conditional logic to make code easier to read.
This commit is contained in:
mdodd 2005-04-12 20:14:56 +00:00
parent 73f010cd0d
commit 1cb970696d
1 changed files with 58 additions and 48 deletions
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106
sys/i386/bios/apm.c
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@ -478,28 +478,26 @@ apm_do_suspend(void)
struct apm_softc *sc = &apm_softc;
int error;
if (!sc)
if (sc == NULL || sc->initialized == 0)
return;
apm_op_inprog = 0;
sc->suspends = sc->suspend_countdown = 0;
if (sc->initialized) {
error = DEVICE_SUSPEND(root_bus);
if (error) {
DEVICE_RESUME(root_bus);
} else {
apm_execute_hook(hook[APM_HOOK_SUSPEND]);
if (apm_suspend_system(PMST_SUSPEND) == 0) {
sc->suspending = 1;
apm_processevent();
} else {
/* Failure, 'resume' the system again */
apm_execute_hook(hook[APM_HOOK_RESUME]);
DEVICE_RESUME(root_bus);
}
}
error = DEVICE_SUSPEND(root_bus);
if (error)
return;
apm_execute_hook(hook[APM_HOOK_SUSPEND]);
if (apm_suspend_system(PMST_SUSPEND) == 0) {
sc->suspending = 1;
apm_processevent();
} else {
/* Failure, 'resume' the system again */
apm_execute_hook(hook[APM_HOOK_RESUME]);
DEVICE_RESUME(root_bus);
}
return;
}
static void
@ -507,20 +505,19 @@ apm_do_standby(void)
{
struct apm_softc *sc = &apm_softc;
if (!sc)
if (sc == NULL || sc->initialized == 0)
return;
apm_op_inprog = 0;
sc->standbys = sc->standby_countdown = 0;
if (sc->initialized) {
/*
* As far as standby, we don't need to execute
* all of suspend hooks.
*/
if (apm_suspend_system(PMST_STANDBY) == 0)
apm_processevent();
}
/*
* As far as standby, we don't need to execute
* all of suspend hooks.
*/
if (apm_suspend_system(PMST_STANDBY) == 0)
apm_processevent();
return;
}
static void
@ -569,7 +566,7 @@ apm_suspend(int state)
{
struct apm_softc *sc = &apm_softc;
if (!sc->initialized)
if (sc == NULL || sc->initialized == 0)
return;
switch (state) {
@ -599,17 +596,13 @@ apm_resume(void)
{
struct apm_softc *sc = &apm_softc;
if (!sc)
return;
if (sc->suspending == 0)
if (sc == NULL || sc->initialized == 0 || sc->suspending == 0)
return;
sc->suspending = 0;
if (sc->initialized) {
apm_execute_hook(hook[APM_HOOK_RESUME]);
DEVICE_RESUME(root_bus);
}
apm_execute_hook(hook[APM_HOOK_RESUME]);
DEVICE_RESUME(root_bus);
return;
}
@ -769,10 +762,14 @@ apm_event_enable(void)
struct apm_softc *sc = &apm_softc;
APM_DPRINT("called apm_event_enable()\n");
if (sc->initialized) {
sc->active = 1;
apm_timeout(sc);
}
if (sc == NULL || sc->initialized == 0)
return;
sc->active = 1;
apm_timeout(sc);
return;
}
/* disable APM BIOS */
@ -782,10 +779,14 @@ apm_event_disable(void)
struct apm_softc *sc = &apm_softc;
APM_DPRINT("called apm_event_disable()\n");
if (sc->initialized) {
untimeout(apm_timeout, NULL, apm_timeout_ch);
sc->active = 0;
}
if (sc == NULL || sc->initialized == 0)
return;
untimeout(apm_timeout, NULL, apm_timeout_ch);
sc->active = 0;
return;
}
/* halt CPU in scheduling loop */
@ -794,8 +795,12 @@ apm_halt_cpu(void)
{
struct apm_softc *sc = &apm_softc;
if (sc->initialized)
sc->always_halt_cpu = 1;
if (sc == NULL || sc->initialized == 0)
return;
sc->always_halt_cpu = 1;
return;
}
/* don't halt CPU in scheduling loop */
@ -804,8 +809,12 @@ apm_not_halt_cpu(void)
{
struct apm_softc *sc = &apm_softc;
if (sc->initialized)
sc->always_halt_cpu = 0;
if (sc == NULL || sc->initialized == 0)
return;
sc->always_halt_cpu = 0;
return;
}
/* device driver definitions */
@ -1226,7 +1235,7 @@ apmopen(struct cdev *dev, int flag, int fmt, struct thread *td)
struct apm_softc *sc = &apm_softc;
int ctl = APMDEV(dev);
if (!sc->initialized)
if (sc == NULL || sc->initialized == 0)
return (ENXIO);
switch (ctl) {
@ -1280,8 +1289,9 @@ apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td
int ret;
int newstate;
if (!sc->initialized)
if (sc == NULL || sc->initialized == 0)
return (ENXIO);
APM_DPRINT("APM ioctl: cmd = 0x%lx\n", cmd);
switch (cmd) {
case APMIO_SUSPEND: