On Wed, Oct 04, 2017 at 08:43:35PM +0200, Hans de Goede wrote:
> Fix a NULL pointer deref (hu->tty) when calling hci_uart_set_flow_control
> on hci_uart-s using serdev.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> Changes in v2:
> -Also set RTS (Suggested-by: Sebastian Reichel <sre@xxxxxxxxxx>)
> ---
> drivers/bluetooth/hci_ldisc.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
> index a746627e784e..eec95019f15c 100644
> --- a/drivers/bluetooth/hci_ldisc.c
> +++ b/drivers/bluetooth/hci_ldisc.c
> @@ -41,6 +41,7 @@
> #include <linux/ioctl.h>
> #include <linux/skbuff.h>
> #include <linux/firmware.h>
> +#include <linux/serdev.h>
I know this is already merged, but do we really want to add a dependency
on serdev from hci_ldisc.c?
There is already a helper function host_set_baudrate() in hci_bcm to
handle another case like this. If more drivers will need to support
both then these could be moved to a common header, but we should at
least try to be consistent here.
> #include <net/bluetooth/bluetooth.h>
> #include <net/bluetooth/hci_core.h>
> @@ -298,6 +299,12 @@ void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
> unsigned int set = 0;
> unsigned int clear = 0;
>
> + if (hu->serdev) {
> + serdev_device_set_flow_control(hu->serdev, !enable);
> + serdev_device_set_rts(hu->serdev, !enable);
The order here may matter; in the non-serdev case, rts is raised before
enabling flow control.
> + return;
> + }
> +
> if (enable) {
> /* Disable hardware flow control */
> ktermios = tty->termios;
Johan
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