On 2015.03.11 16:04, Quentin Lambert wrote: > 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; You'll probably have to remake this patch without this change because a patch I've submitted a few days ago completely removes these and 2 other ones depend on it. It's still not in staging-testing for some reason :( -- Thanks, Giedrius _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
