Hi,
On 07-10-17 16:36, Johan Hovold wrote:
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.
That is a valiud question, Marcel do you want me to do a follow
up series which:
1) Reverts this commit; and
2) Add a host_set_flow_control helper to hci_bcm.c ?
#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.
AFAIK it should not matter, if RTS is not set before enabling, then CTS
may not be set by the other side yet and the hw flow-control will
wait for CTS to get raised.
Regards,
Hans
+ return;
+ }
+
if (enable) {
/* Disable hardware flow control */
ktermios = tty->termios;
Johan
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