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Convert tty common code to use make_dev_s().

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Tty.c was untypical in that it handled the si_drv1 issue consistently
and correctly, by always checking for si_drv1 being non-NULL and
sleeping if NULL.  The removed code also illustrated unneeded
complications in drivers which are eliminated by the use of new KPI.

Reviewed by:	hps, jhb
Discussed with:	bde
Sponsored by:	The FreeBSD Foundation
MFC after:	3 weeks
Differential revision:	https://reviews.freebsd.org/D4746
This commit is contained in:
Konstantin Belousov 2016-01-07 20:15:09 +00:00
parent 48ce5d4cac
commit 0de1455462
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=293349
1 changed files with 47 additions and 52 deletions
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99
sys/kern/tty.c
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@ -237,14 +237,10 @@ static int
ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct tty *tp;
int error = 0;
while ((tp = dev->si_drv1) == NULL) {
error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1);
if (error != EWOULDBLOCK)
return (error);
}
int error;
tp = dev->si_drv1;
error = 0;
tty_lock(tp);
if (tty_gone(tp)) {
/* Device is already gone. */
@ -755,13 +751,10 @@ static int
ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct tty *tp;
int error = 0;
int error;
while ((tp = dev->si_drv1) == NULL) {
error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1);
if (error != EWOULDBLOCK)
return (error);
}
tp = dev->si_drv1;
error = 0;
tty_lock(tp);
if (tty_gone(tp))
error = ENODEV;
@ -1189,6 +1182,7 @@ tty_makedevf(struct tty *tp, struct ucred *cred, int flags,
const char *fmt, ...)
{
va_list ap;
struct make_dev_args args;
struct cdev *dev, *init, *lock, *cua, *cinit, *clock;
const char *prefix = "tty";
char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */
@ -1221,71 +1215,72 @@ tty_makedevf(struct tty *tp, struct ucred *cred, int flags,
flags |= MAKEDEV_CHECKNAME;
/* Master call-in device. */
error = make_dev_p(flags, &dev, &ttydev_cdevsw, cred, uid, gid, mode,
"%s%s", prefix, name);
if (error)
make_dev_args_init(&args);
args.mda_flags = flags;
args.mda_devsw = &ttydev_cdevsw;
args.mda_cr = cred;
args.mda_uid = uid;
args.mda_gid = gid;
args.mda_mode = mode;
args.mda_si_drv1 = tp;
error = make_dev_s(&args, &dev, "%s%s", prefix, name);
if (error != 0)
return (error);
dev->si_drv1 = tp;
wakeup(&dev->si_drv1);
tp->t_dev = dev;
init = lock = cua = cinit = clock = NULL;
/* Slave call-in devices. */
if (tp->t_flags & TF_INITLOCK) {
error = make_dev_p(flags, &init, &ttyil_cdevsw, cred, uid,
gid, mode, "%s%s.init", prefix, name);
if (error)
args.mda_devsw = &ttyil_cdevsw;
args.mda_unit = TTYUNIT_INIT;
args.mda_si_drv1 = tp;
args.mda_si_drv2 = &tp->t_termios_init_in;
error = make_dev_s(&args, &init, "%s%s.init", prefix, name);
if (error != 0)
goto fail;
dev_depends(dev, init);
dev2unit(init) = TTYUNIT_INIT;
init->si_drv1 = tp;
wakeup(&init->si_drv1);
init->si_drv2 = &tp->t_termios_init_in;
error = make_dev_p(flags, &lock, &ttyil_cdevsw, cred, uid,
gid, mode, "%s%s.lock", prefix, name);
if (error)
args.mda_unit = TTYUNIT_LOCK;
args.mda_si_drv2 = &tp->t_termios_lock_in;
error = make_dev_s(&args, &lock, "%s%s.lock", prefix, name);
if (error != 0)
goto fail;
dev_depends(dev, lock);
dev2unit(lock) = TTYUNIT_LOCK;
lock->si_drv1 = tp;
wakeup(&lock->si_drv1);
lock->si_drv2 = &tp->t_termios_lock_in;
}
/* Call-out devices. */
if (tp->t_flags & TF_CALLOUT) {
error = make_dev_p(flags, &cua, &ttydev_cdevsw, cred,
UID_UUCP, GID_DIALER, 0660, "cua%s", name);
if (error)
make_dev_args_init(&args);
args.mda_flags = flags;
args.mda_devsw = &ttydev_cdevsw;
args.mda_cr = cred;
args.mda_uid = UID_UUCP;
args.mda_gid = GID_DIALER;
args.mda_mode = 0660;
args.mda_unit = TTYUNIT_CALLOUT;
args.mda_si_drv1 = tp;
error = make_dev_s(&args, &cua, "cua%s", name);
if (error != 0)
goto fail;
dev_depends(dev, cua);
dev2unit(cua) = TTYUNIT_CALLOUT;
cua->si_drv1 = tp;
wakeup(&cua->si_drv1);
/* Slave call-out devices. */
if (tp->t_flags & TF_INITLOCK) {
error = make_dev_p(flags, &cinit, &ttyil_cdevsw, cred,
UID_UUCP, GID_DIALER, 0660, "cua%s.init", name);
if (error)
args.mda_devsw = &ttyil_cdevsw;
args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_INIT;
args.mda_si_drv2 = &tp->t_termios_init_out;
error = make_dev_s(&args, &cinit, "cua%s.init", name);
if (error != 0)
goto fail;
dev_depends(dev, cinit);
dev2unit(cinit) = TTYUNIT_CALLOUT | TTYUNIT_INIT;
cinit->si_drv1 = tp;
wakeup(&cinit->si_drv1);
cinit->si_drv2 = &tp->t_termios_init_out;
error = make_dev_p(flags, &clock, &ttyil_cdevsw, cred,
UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name);
if (error)
args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_LOCK;
args.mda_si_drv2 = &tp->t_termios_lock_out;
error = make_dev_s(&args, &clock, "cua%s.lock", name);
if (error != 0)
goto fail;
dev_depends(dev, clock);
dev2unit(clock) = TTYUNIT_CALLOUT | TTYUNIT_LOCK;
clock->si_drv1 = tp;
wakeup(&clock->si_drv1);
clock->si_drv2 = &tp->t_termios_lock_out;
}
}