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@xxxxxxxxx> --- drivers/staging/dgnc/dgnc_cls.c | 19 +++++++------------ drivers/staging/dgnc/dgnc_driver.c | 14 +++----------- drivers/staging/dgnc/dgnc_neo.c | 30 ++++++++++++------------------ 3 files changed, 22 insertions(+), 41 deletions(-) diff --git a/drivers/staging/dgnc/dgnc_cls.c b/drivers/staging/dgnc/dgnc_cls.c index bedc522..02f19f1 100644 --- a/drivers/staging/dgnc/dgnc_cls.c +++ b/drivers/staging/dgnc/dgnc_cls.c @@ -1029,22 +1029,16 @@ static void cls_copy_data_from_queue_to_uart(struct channel_t *ch) spin_lock_irqsave(&ch->ch_lock, flags); /* No data to write to the UART */ - if (ch->ch_w_tail == ch->ch_w_head) { - spin_unlock_irqrestore(&ch->ch_lock, flags); - return; - } + if (ch->ch_w_tail == ch->ch_w_head) + goto exit_unlock; /* If port is "stopped", don't send any data to the UART */ if ((ch->ch_flags & CH_FORCED_STOP) || - (ch->ch_flags & CH_BREAK_SENDING)) { - spin_unlock_irqrestore(&ch->ch_lock, flags); - return; - } + (ch->ch_flags & CH_BREAK_SENDING)) + goto exit_unlock; - if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) { - spin_unlock_irqrestore(&ch->ch_lock, flags); - return; - } + if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) + goto exit_unlock; n = 32; @@ -1094,6 +1088,7 @@ static void cls_copy_data_from_queue_to_uart(struct channel_t *ch) if (len_written > 0) ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); +exit_unlock: spin_unlock_irqrestore(&ch->ch_lock, flags); } diff --git a/drivers/staging/dgnc/dgnc_driver.c b/drivers/staging/dgnc/dgnc_driver.c index b7fd2bf..9387a0e 100644 --- a/drivers/staging/dgnc/dgnc_driver.c +++ b/drivers/staging/dgnc/dgnc_driver.c @@ -572,30 +572,19 @@ static int dgnc_found_board(struct pci_dev *pdev, int id) rc = dgnc_tty_register(brd); if (rc < 0) { - dgnc_tty_uninit(brd); pr_err(DRVSTR ": Can't register tty devices (%d)\n", rc); - brd->state = BOARD_FAILED; - brd->dpastatus = BD_NOFEP; goto failed; } rc = dgnc_finalize_board_init(brd); if (rc < 0) { - dgnc_tty_uninit(brd); pr_err(DRVSTR ": Can't finalize board init (%d)\n", rc); - brd->state = BOARD_FAILED; - brd->dpastatus = BD_NOFEP; - goto failed; } rc = dgnc_tty_init(brd); if (rc < 0) { - dgnc_tty_uninit(brd); pr_err(DRVSTR ": Can't init tty devices (%d)\n", rc); - brd->state = BOARD_FAILED; - brd->dpastatus = BD_NOFEP; - goto failed; } @@ -629,6 +618,9 @@ static int dgnc_found_board(struct pci_dev *pdev, int id) return 0; failed: + dgnc_tty_uninit(brd); + brd->state = BOARD_FAILED; + brd->dpastatus = BD_NOFEP; return -ENXIO; diff --git a/drivers/staging/dgnc/dgnc_neo.c b/drivers/staging/dgnc/dgnc_neo.c index 1268aa9..4deae2d 100644 --- a/drivers/staging/dgnc/dgnc_neo.c +++ b/drivers/staging/dgnc/dgnc_neo.c @@ -1436,16 +1436,13 @@ static void neo_copy_data_from_queue_to_uart(struct channel_t *ch) spin_lock_irqsave(&ch->ch_lock, flags); /* No data to write to the UART */ - if (ch->ch_w_tail == ch->ch_w_head) { - spin_unlock_irqrestore(&ch->ch_lock, flags); - return; - } + if (ch->ch_w_tail == ch->ch_w_head) + goto exit_unlock; /* If port is "stopped", don't send any data to the UART */ - if ((ch->ch_flags & CH_FORCED_STOP) || (ch->ch_flags & CH_BREAK_SENDING)) { - spin_unlock_irqrestore(&ch->ch_lock, flags); - return; - } + if ((ch->ch_flags & CH_FORCED_STOP) || + (ch->ch_flags & CH_BREAK_SENDING)) + goto exit_unlock; /* * If FIFOs are disabled. Send data directly to txrx register @@ -1486,27 +1483,23 @@ static void neo_copy_data_from_queue_to_uart(struct channel_t *ch) ch->ch_w_tail &= WQUEUEMASK; ch->ch_txcount++; } - spin_unlock_irqrestore(&ch->ch_lock, flags); - return; + + goto exit_unlock; } /* * We have to do it this way, because of the EXAR TXFIFO count bug. */ if ((ch->ch_bd->dvid & 0xf0) < UART_XR17E158_DVID) { - if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) { - spin_unlock_irqrestore(&ch->ch_lock, flags); - return; - } + if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) + goto exit_unlock; len_written = 0; n = readb(&ch->ch_neo_uart->tfifo); - if ((unsigned int) n > ch->ch_t_tlevel) { - spin_unlock_irqrestore(&ch->ch_lock, flags); - return; - } + if ((unsigned int) n > ch->ch_t_tlevel) + goto exit_unlock; n = UART_17158_TX_FIFOSIZE - ch->ch_t_tlevel; } else { @@ -1570,6 +1563,7 @@ static void neo_copy_data_from_queue_to_uart(struct channel_t *ch) ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); } +exit_unlock: spin_unlock_irqrestore(&ch->ch_lock, flags); } -- 1.9.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
