Lock spic(4) and mark it MPSAFE:
- Add a per-softc mutex as a driver lock. - Use callout(9) instead of timeout(9). - Set softc pointer in si_drv1 of cdev instead of looking softc up via devclass in cdev methods. Tested by: no one
This commit is contained in:
John Baldwin
parent
7e88c64c79
commit
87c4a62333
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=274759
@ -87,7 +87,6 @@ static d_poll_t spicpoll;
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static struct cdevsw spic_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_open = spicopen,
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.d_close = spicclose,
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.d_read = spicread,
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@ -106,8 +105,10 @@ struct spic_softc {
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int sc_opened;
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int sc_sleeping;
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int sc_buttonlast;
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struct callout_handle sc_timeout_ch;
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struct callout sc_timeout;
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struct mtx sc_lock;
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device_t sc_dev;
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struct cdev *sc_cdev;
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struct selinfo sc_rsel;
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u_char sc_buf[SCBUFLEN];
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int sc_count;
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@ -337,6 +338,8 @@ spic_attach(device_t dev)
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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mtx_init(&sc->sc_lock, "spic", NULL, MTX_DEF);
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callout_init_mtx(&sc->sc_timeout, &sc->sc_lock, 0);
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spic_pollrate = (hz/50); /* Every 50th of a second */
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@ -345,7 +348,8 @@ spic_attach(device_t dev)
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spic_call1(sc, 0x92);
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/* There can be only one */
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make_dev(&spic_cdevsw, 0, 0, 0, 0600, "jogdial");
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sc->sc_cdev = make_dev(&spic_cdevsw, 0, 0, 0, 0600, "jogdial");
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sc->sc_cdev->si_drv1 = sc;
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return 0;
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}
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@ -357,6 +361,7 @@ spictimeout(void *arg)
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u_char b, event, param;
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int j;
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mtx_assert(&sc->sc_lock, MA_OWNED);
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if (!sc->sc_opened) {
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device_printf(sc->sc_dev, "timeout called while closed!\n");
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return;
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@ -426,7 +431,7 @@ spictimeout(void *arg)
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}
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else {
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/* No event. Wait some more */
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sc->sc_timeout_ch = timeout(spictimeout, sc, spic_pollrate);
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callout_reset(&sc->sc_timeout, spic_pollrate, spictimeout, sc);
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return;
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}
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@ -439,7 +444,7 @@ spictimeout(void *arg)
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}
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spic_call2(sc, 0x81, 0xff); /* Clear event */
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sc->sc_timeout_ch = timeout(spictimeout, sc, spic_pollrate);
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callout_reset(&sc->sc_timeout, spic_pollrate, spictimeout, sc);
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}
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static int
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@ -447,17 +452,21 @@ spicopen(struct cdev *dev, int flag, int fmt, struct thread *td)
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{
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struct spic_softc *sc;
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sc = devclass_get_softc(spic_devclass, 0);
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sc = dev->si_drv1;
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if (sc->sc_opened)
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return EBUSY;
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mtx_lock(&sc->sc_lock);
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if (sc->sc_opened) {
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mtx_unlock(&sc->sc_lock);
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return (EBUSY);
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}
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sc->sc_opened++;
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sc->sc_count=0;
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/* Start the polling */
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timeout(spictimeout, sc, spic_pollrate);
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return 0;
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callout_reset(&sc->sc_timeout, spic_pollrate, spictimeout, sc);
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mtx_unlock(&sc->sc_lock);
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return (0);
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}
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static int
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@ -465,11 +474,13 @@ spicclose(struct cdev *dev, int flag, int fmt, struct thread *td)
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{
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struct spic_softc *sc;
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sc = devclass_get_softc(spic_devclass, 0);
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sc = dev->si_drv1;
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mtx_lock(&sc->sc_lock);
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/* Stop polling */
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untimeout(spictimeout, sc, sc->sc_timeout_ch);
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callout_stop(&sc->sc_timeout);
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sc->sc_opened = 0;
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mtx_unlock(&sc->sc_lock);
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return 0;
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}
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@ -477,34 +488,31 @@ static int
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spicread(struct cdev *dev, struct uio *uio, int flag)
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{
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struct spic_softc *sc;
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int l, s, error;
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int l, error;
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u_char buf[SCBUFLEN];
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sc = devclass_get_softc(spic_devclass, 0);
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sc = dev->si_drv1;
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if (uio->uio_resid <= 0) /* What kind of a read is this?! */
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return 0;
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return (0);
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s = spltty();
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mtx_lock(&sc->sc_lock);
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while (!(sc->sc_count)) {
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sc->sc_sleeping=1;
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error = tsleep( sc, PZERO | PCATCH, "jogrea", 0);
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error = mtx_sleep(sc, &sc->sc_lock, PZERO | PCATCH, "jogrea", 0);
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sc->sc_sleeping=0;
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if (error) {
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splx(s);
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return error;
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mtx_unlock(&sc->sc_lock);
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return (error);
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}
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}
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splx(s);
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s = spltty();
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l = min(uio->uio_resid, sc->sc_count);
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bcopy(sc->sc_buf, buf, l);
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sc->sc_count -= l;
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bcopy(sc->sc_buf + l, sc->sc_buf, l);
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splx(s);
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return uiomove(buf, l, uio);
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mtx_unlock(&sc->sc_lock);
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return (uiomove(buf, l, uio));
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}
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static int
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@ -512,28 +520,28 @@ spicioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *t
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{
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struct spic_softc *sc;
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sc = devclass_get_softc(spic_devclass, 0);
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sc = dev->si_drv1;
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return EIO;
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return (EIO);
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}
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static int
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spicpoll(struct cdev *dev, int events, struct thread *td)
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{
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struct spic_softc *sc;
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int revents = 0, s;
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int revents = 0;
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sc = devclass_get_softc(spic_devclass, 0);
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s = spltty();
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sc = dev->si_drv1;
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mtx_lock(&sc->sc_lock);
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if (events & (POLLIN | POLLRDNORM)) {
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if (sc->sc_count)
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revents |= events & (POLLIN | POLLRDNORM);
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else
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selrecord(td, &sc->sc_rsel); /* Who shall we wake? */
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}
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splx(s);
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mtx_unlock(&sc->sc_lock);
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return revents;
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return (revents);
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}
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