After inspection made by Markus using Coccinelle software, he observed that we could possibly be triggering a NULL pointer dereference in 2 functions [0]. After discussion in mailing list, it was observed in fact we have two unnecessary checks for NULL pointer, and they were leading to Coccinelle warn. So, instead of reworking the code as proposed by him, we hereby remove the unnecessary checks, and also some unneeded extra lines in the code. These two unnecessary NULL checks were tracked in the call chain as never NULL, so they can be safely removed. No functional changes are intended. [0] https://lkml.org/lkml/2017/11/29/705 Suggested-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxxxxxxxxxx> --- drivers/tty/serial/jsm/jsm_neo.c | 3 --- drivers/tty/serial/jsm/jsm_tty.c | 6 ------ 2 files changed, 9 deletions(-) diff --git a/drivers/tty/serial/jsm/jsm_neo.c b/drivers/tty/serial/jsm/jsm_neo.c index 4718560b8fdc..6fa9a54b2454 100644 --- a/drivers/tty/serial/jsm/jsm_neo.c +++ b/drivers/tty/serial/jsm/jsm_neo.c @@ -282,9 +282,6 @@ static void neo_copy_data_from_uart_to_queue(struct jsm_channel *ch) u16 head; u16 tail; - if (!ch) - return; - /* cache head and tail of queue */ head = ch->ch_r_head & RQUEUEMASK; tail = ch->ch_r_tail & RQUEUEMASK; diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c index 469927d37b41..b6bd6e15e07b 100644 --- a/drivers/tty/serial/jsm/jsm_tty.c +++ b/drivers/tty/serial/jsm/jsm_tty.c @@ -523,9 +523,6 @@ void jsm_input(struct jsm_channel *ch) jsm_dbg(READ, &ch->ch_bd->pci_dev, "start\n"); - if (!ch) - return; - port = &ch->uart_port.state->port; tp = port->tty; @@ -648,11 +645,8 @@ static void jsm_carrier(struct jsm_channel *ch) int phys_carrier = 0; jsm_dbg(CARR, &ch->ch_bd->pci_dev, "start\n"); - if (!ch) - return; bd = ch->ch_bd; - if (!bd) return; -- 2.15.0 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
