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Avoid recursive locking.

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This commit is contained in:
Hans Petter Selasky 2015-02-16 15:46:16 +00:00
parent 4464c5e5e6
commit b41892e1f8
1 changed files with 14 additions and 5 deletions
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19
sys/dev/usb/video/udl.c
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@ -428,11 +428,10 @@ udl_fb_setblankmode(void *arg, int mode)
}
static struct udl_cmd_buf *
udl_cmd_buf_alloc(struct udl_softc *sc, int flags)
udl_cmd_buf_alloc_locked(struct udl_softc *sc, int flags)
{
struct udl_cmd_buf *cb;
UDL_LOCK(sc);
while ((cb = TAILQ_FIRST(&sc->sc_cmd_buf_free)) == NULL) {
if (flags != M_WAITOK)
break;
@ -442,6 +441,16 @@ udl_cmd_buf_alloc(struct udl_softc *sc, int flags)
TAILQ_REMOVE(&sc->sc_cmd_buf_free, cb, entry);
cb->off = 0;
}
return (cb);
}
static struct udl_cmd_buf *
udl_cmd_buf_alloc(struct udl_softc *sc, int flags)
{
struct udl_cmd_buf *cb;
UDL_LOCK(sc);
cb = udl_cmd_buf_alloc_locked(sc, flags);
UDL_UNLOCK(sc);
return (cb);
}
@ -465,7 +474,7 @@ udl_cmd_buf_send(struct udl_softc *sc, struct udl_cmd_buf *cb)
}
static struct udl_cmd_buf *
udl_fb_synchronize(struct udl_softc *sc)
udl_fb_synchronize_locked(struct udl_softc *sc)
{
const uint32_t max = udl_get_fb_size(sc);
@ -482,7 +491,7 @@ udl_fb_synchronize(struct udl_softc *sc)
if (bcmp(sc->sc_fb_addr + sc->sc_sync_off, sc->sc_fb_copy + sc->sc_sync_off, delta) != 0) {
struct udl_cmd_buf *cb;
cb = udl_cmd_buf_alloc(sc, M_NOWAIT);
cb = udl_cmd_buf_alloc_locked(sc, M_NOWAIT);
if (cb == NULL)
goto done;
memcpy(sc->sc_fb_copy + sc->sc_sync_off,
@ -518,7 +527,7 @@ tr_setup:
for (i = 0; i != UDL_CMD_MAX_FRAMES; i++) {
cb = TAILQ_FIRST(&sc->sc_cmd_buf_pending);
if (cb == NULL) {
cb = udl_fb_synchronize(sc);
cb = udl_fb_synchronize_locked(sc);
if (cb == NULL)
break;
} else {