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[PATCH] dvb: dst: protect dst_write_tuna from simultaneous writes

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dst_write_tuna needs to be protected against simultaeneous writes, just like
dst_command

Signed-off-by: Henrik Sjoberg <henke@epact.se>
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Cc: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Henrik Sjoberg 2005-11-08 21:35:38 -08:00 committed by Linus Torvalds
parent d28d57629f
commit f1016dec71
1 changed files with 17 additions and 12 deletions
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29
drivers/media/dvb/bt8xx/dst.c
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@ -1077,7 +1077,7 @@ static int dst_get_tuna(struct dst_state *state)
return 0;
state->diseq_flags &= ~(HAS_LOCK);
if (!dst_wait_dst_ready(state, NO_DELAY))
return 0;
return -EIO;
if (state->type_flags & DST_TYPE_HAS_NEWTUNE)
/* how to get variable length reply ???? */
retval = read_dst(state, state->rx_tuna, 10);
@ -1085,22 +1085,21 @@ static int dst_get_tuna(struct dst_state *state)
retval = read_dst(state, &state->rx_tuna[2], FIXED_COMM);
if (retval < 0) {
dprintk(verbose, DST_DEBUG, 1, "read not successful");
return 0;
return retval;
}
if (state->type_flags & DST_TYPE_HAS_NEWTUNE) {
if (state->rx_tuna[9] != dst_check_sum(&state->rx_tuna[0], 9)) {
dprintk(verbose, DST_INFO, 1, "checksum failure ? ");
return 0;
return -EIO;
}
} else {
if (state->rx_tuna[9] != dst_check_sum(&state->rx_tuna[2], 7)) {
dprintk(verbose, DST_INFO, 1, "checksum failure? ");
return 0;
return -EIO;
}
}
if (state->rx_tuna[2] == 0 && state->rx_tuna[3] == 0)
return 0;
if (state->dst_type == DST_TYPE_IS_SAT) {
state->decode_freq = ((state->rx_tuna[2] & 0x7f) << 8) + state->rx_tuna[3];
} else {
@ -1129,10 +1128,10 @@ static int dst_write_tuna(struct dvb_frontend *fe)
dst_set_voltage(fe, SEC_VOLTAGE_13);
}
state->diseq_flags &= ~(HAS_LOCK | ATTEMPT_TUNE);
down(&state->dst_mutex);
if ((dst_comm_init(state)) < 0) {
dprintk(verbose, DST_DEBUG, 1, "DST Communication initialization failed.");
return -1;
goto error;
}
if (state->type_flags & DST_TYPE_HAS_NEWTUNE) {
state->tx_tuna[9] = dst_check_sum(&state->tx_tuna[0], 9);
@ -1144,23 +1143,29 @@ static int dst_write_tuna(struct dvb_frontend *fe)
if (retval < 0) {
dst_pio_disable(state);
dprintk(verbose, DST_DEBUG, 1, "write not successful");
return retval;
goto werr;
}
if ((dst_pio_disable(state)) < 0) {
dprintk(verbose, DST_DEBUG, 1, "DST PIO disable failed !");
return -1;
goto error;
}
if ((read_dst(state, &reply, GET_ACK) < 0)) {
dprintk(verbose, DST_DEBUG, 1, "read verify not successful.");
return -1;
goto error;
}
if (reply != ACK) {
dprintk(verbose, DST_DEBUG, 1, "write not acknowledged 0x%02x ", reply);
return 0;
goto error;
}
state->diseq_flags |= ATTEMPT_TUNE;
retval = dst_get_tuna(state);
werr:
up(&state->dst_mutex);
return retval;
return dst_get_tuna(state);
error:
up(&state->dst_mutex);
return -EIO;
}
/*