Hi Zijun,
> QCA6390 memdump VSE sometimes come to bluetooth driver
> with wrong sequence number as illustrated as follows:
> frame # in dec: frame data in hex
> 1396: ff fd 01 08 74 05 00 37 8f 14
> 1397: ff fd 01 08 75 05 00 ff bf 38
> 1414: ff fd 01 08 86 05 00 fb 5e 4b
> 1399: ff fd 01 08 77 05 00 f3 44 0a
> 1400: ff fd 01 08 78 05 00 ca f7 41
> it is mistook for controller missing packets, so results
> in page fault after overwriting memdump buffer allocated.
>
> Fixed by ignoring QCA6390 sequence number check and
> checking buffer space before writing.
>
> Signed-off-by: Zijun Hu <zij...@codeaurora.org>
> Tested-by: Zijun Hu <zij...@codeaurora.org>
> ---
> Changes in v4:
> - add a piece of code comments
> Changes in v3:
> - correct coding style
> Changes in v2:
> - rename a local variable from @temp to @rx_size
>
> drivers/bluetooth/hci_qca.c | 49 ++++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 42 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index e4a6823..4acac13 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -114,6 +114,7 @@ struct qca_memdump_data {
> char *memdump_buf_tail;
> u32 current_seq_no;
> u32 received_dump;
> + u32 ram_dump_size;
> };
>
> struct qca_memdump_event_hdr {
> @@ -976,6 +977,8 @@ static void qca_controller_memdump(struct work_struct
> *work)
> char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 };
> u16 seq_no;
> u32 dump_size;
> + u32 rx_size;
> + enum qca_btsoc_type soc_type = qca_soc_type(hu);
>
> while ((skb = skb_dequeue(&qca->rx_memdump_q))) {
>
> @@ -1029,6 +1032,7 @@ static void qca_controller_memdump(struct work_struct
> *work)
>
> skb_pull(skb, sizeof(dump_size));
> memdump_buf = vmalloc(dump_size);
> + qca_memdump->ram_dump_size = dump_size;
> qca_memdump->memdump_buf_head = memdump_buf;
> qca_memdump->memdump_buf_tail = memdump_buf;
> }
> @@ -1051,26 +1055,57 @@ static void qca_controller_memdump(struct work_struct
> *work)
> * the controller. In such cases let us store the dummy
> * packets in the buffer.
> */
> + /* For QCA6390, controller does not lost packets but
> + * sequence number field of packat sometimes has error
> + * bits, so skip this checking for missing packet.
> + */
> while ((seq_no > qca_memdump->current_seq_no + 1) &&
> + (soc_type != QCA_QCA6390) &&
> seq_no != QCA_LAST_SEQUENCE_NUM) {
> bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
> qca_memdump->current_seq_no);
> + rx_size = qca_memdump->received_dump;
> + rx_size += QCA_DUMP_PACKET_SIZE;
> + if (rx_size > qca_memdump->ram_dump_size) {
> + bt_dev_err(hu->hdev,
> + "QCA memdump received %d, no
> space for missed packet",
> + qca_memdump->received_dump);
please use correct indentation according to the coding style.
Regards
Marcel
