Differential D19713 Diff 56234 head/sys/dev/tpm/tpm20.c

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head/sys/dev/tpm/tpm20.c

Show First 20 Lines • Show All 71 Lines • ▼ Show 20 Lines	tpm20_read(struct cdev dev, struct uio uio, int flags)
struct tpm_sc *sc;		struct tpm_sc *sc;
size_t bytes_to_transfer;		size_t bytes_to_transfer;
int result = 0;		int result = 0;

sc = (struct tpm_sc *)dev->si_drv1;		sc = (struct tpm_sc *)dev->si_drv1;

callout_stop(&sc->discard_buffer_callout);		callout_stop(&sc->discard_buffer_callout);
sx_xlock(&sc->dev_lock);		sx_xlock(&sc->dev_lock);
		if (sc->owner_tid != uio->uio_td->td_tid) {
		sx_xunlock(&sc->dev_lock);
		return (EPERM);
		}

bytes_to_transfer = MIN(sc->pending_data_length, uio->uio_resid);		bytes_to_transfer = MIN(sc->pending_data_length, uio->uio_resid);
if (bytes_to_transfer > 0) {		if (bytes_to_transfer > 0) {
result = uiomove((caddr_t) sc->buf, bytes_to_transfer, uio);		result = uiomove((caddr_t) sc->buf, bytes_to_transfer, uio);
memset(sc->buf, 0, TPM_BUFSIZE);		memset(sc->buf, 0, TPM_BUFSIZE);
sc->pending_data_length = 0;		sc->pending_data_length = 0;
cv_signal(&sc->buf_cv);		cv_signal(&sc->buf_cv);
} else {		} else {
Show All 35 Lines	tpm20_write(struct cdev dev, struct uio uio, int flags)
result = uiomove(sc->buf, byte_count, uio);		result = uiomove(sc->buf, byte_count, uio);
if (result != 0) {		if (result != 0) {
sx_xunlock(&sc->dev_lock);		sx_xunlock(&sc->dev_lock);
return (result);		return (result);
}		}

result = sc->transmit(sc, byte_count);		result = sc->transmit(sc, byte_count);

if (result == 0)		if (result == 0) {
callout_reset(&sc->discard_buffer_callout,		callout_reset(&sc->discard_buffer_callout,
TPM_READ_TIMEOUT / tick, tpm20_discard_buffer, sc);		TPM_READ_TIMEOUT / tick, tpm20_discard_buffer, sc);
		sc->owner_tid = uio->uio_td->td_tid;
		}

sx_xunlock(&sc->dev_lock);		sx_xunlock(&sc->dev_lock);
return (result);		return (result);
}		}

static void tpm20_discard_buffer(void *arg)		static void tpm20_discard_buffer(void *arg)
{		{
struct tpm_sc *sc;		struct tpm_sc *sc;
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