Staging: dgnc: Use goto for error handling
This patch introduces goto statments for error handling and in cases where a lock needs to be released. A simplified version of the semantic patch that finds this problem is as follows: (http://coccinelle.lip6.fr) @candidates exists@ identifier f, label; statement s; position p1, p2, p3; @@ f@p1(...) { ...when any if@p2(...) { ...when any s return@p3 ...; } ...when any } @good1 exists@ identifier candidates.f, candidates.label; statement candidates.s; position candidates.p1, candidates.p2; @@ f@p1(...) { ...when any if(...) { ...when any s return ...; } ...when any if@p2(...) {...} ...when any } @depends on good1@ identifier candidates.f, candidates.label; position candidates.p1, candidates.p3; @@ f@p1(...) { ...when any * return@p3 ...; } Signed-off-by: Quentin Lambert <lambert.quentin@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -988,22 +988,16 @@ static void cls_copy_data_from_queue_to_uart(struct channel_t *ch)
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spin_lock_irqsave(&ch->ch_lock, flags);
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/* No data to write to the UART */
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if (ch->ch_w_tail == ch->ch_w_head) {
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return;
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}
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if (ch->ch_w_tail == ch->ch_w_head)
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goto exit_unlock;
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/* If port is "stopped", don't send any data to the UART */
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if ((ch->ch_flags & CH_FORCED_STOP) ||
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(ch->ch_flags & CH_BREAK_SENDING)) {
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return;
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}
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(ch->ch_flags & CH_BREAK_SENDING))
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goto exit_unlock;
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if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) {
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return;
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}
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if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM)))
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goto exit_unlock;
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n = 32;
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@ -1053,6 +1047,7 @@ static void cls_copy_data_from_queue_to_uart(struct channel_t *ch)
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if (len_written > 0)
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ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
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exit_unlock:
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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}
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@ -549,30 +549,19 @@ static int dgnc_found_board(struct pci_dev *pdev, int id)
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rc = dgnc_tty_register(brd);
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if (rc < 0) {
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dgnc_tty_uninit(brd);
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pr_err(DRVSTR ": Can't register tty devices (%d)\n", rc);
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brd->state = BOARD_FAILED;
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brd->dpastatus = BD_NOFEP;
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goto failed;
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}
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rc = dgnc_finalize_board_init(brd);
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if (rc < 0) {
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dgnc_tty_uninit(brd);
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pr_err(DRVSTR ": Can't finalize board init (%d)\n", rc);
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brd->state = BOARD_FAILED;
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brd->dpastatus = BD_NOFEP;
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goto failed;
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}
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rc = dgnc_tty_init(brd);
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if (rc < 0) {
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dgnc_tty_uninit(brd);
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pr_err(DRVSTR ": Can't init tty devices (%d)\n", rc);
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brd->state = BOARD_FAILED;
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brd->dpastatus = BD_NOFEP;
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goto failed;
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}
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@ -606,6 +595,9 @@ static int dgnc_found_board(struct pci_dev *pdev, int id)
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return 0;
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failed:
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dgnc_tty_uninit(brd);
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brd->state = BOARD_FAILED;
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brd->dpastatus = BD_NOFEP;
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return -ENXIO;
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@ -1420,16 +1420,13 @@ static void neo_copy_data_from_queue_to_uart(struct channel_t *ch)
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spin_lock_irqsave(&ch->ch_lock, flags);
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/* No data to write to the UART */
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if (ch->ch_w_tail == ch->ch_w_head) {
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return;
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}
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if (ch->ch_w_tail == ch->ch_w_head)
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goto exit_unlock;
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/* If port is "stopped", don't send any data to the UART */
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if ((ch->ch_flags & CH_FORCED_STOP) || (ch->ch_flags & CH_BREAK_SENDING)) {
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return;
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}
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if ((ch->ch_flags & CH_FORCED_STOP) ||
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(ch->ch_flags & CH_BREAK_SENDING))
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goto exit_unlock;
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/*
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* If FIFOs are disabled. Send data directly to txrx register
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@ -1470,27 +1467,23 @@ static void neo_copy_data_from_queue_to_uart(struct channel_t *ch)
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ch->ch_w_tail &= WQUEUEMASK;
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ch->ch_txcount++;
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}
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return;
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goto exit_unlock;
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}
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/*
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* We have to do it this way, because of the EXAR TXFIFO count bug.
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*/
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if ((ch->ch_bd->dvid & 0xf0) < UART_XR17E158_DVID) {
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if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) {
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return;
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}
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if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM)))
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goto exit_unlock;
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len_written = 0;
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n = readb(&ch->ch_neo_uart->tfifo);
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if ((unsigned int) n > ch->ch_t_tlevel) {
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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return;
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}
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if ((unsigned int) n > ch->ch_t_tlevel)
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goto exit_unlock;
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n = UART_17158_TX_FIFOSIZE - ch->ch_t_tlevel;
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} else {
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@ -1554,6 +1547,7 @@ static void neo_copy_data_from_queue_to_uart(struct channel_t *ch)
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ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
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}
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exit_unlock:
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spin_unlock_irqrestore(&ch->ch_lock, flags);
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}
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