On Sat, Feb 11, 2017 at 7:06 AM, P J P <ppandit@redhat.com> wrote:
> From: Prasad J Pandit <pjp@fedoraproject.org>
>
> In the SDHCI protocol, the transfer mode register value
> is used during multi block transfer to check if block count
> register is enabled and should be updated. Transfer mode
> register could be set such that, block count register would
> not be updated, thus leading to an infinite loop. Add check
> to avoid it.
>
> Reported-by: Wjjzhang <wjjzhang@tencent.com>
> Reported-by: Jiang Xin <jiangxin1@huawei.com>
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Thanks,
Alistair
> ---
> hw/sd/sdhci.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> Update: use qemu_log_mask(LOG_UNIMP, ...)
> -> https://lists.gnu.org/archive/html/qemu-devel/2017-02/msg02354.html
>
> diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
> index 5bd5ab6..a9c744b 100644
> --- a/hw/sd/sdhci.c
> +++ b/hw/sd/sdhci.c
> @@ -486,6 +486,11 @@ static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
> uint32_t boundary_chk = 1 << (((s->blksize & 0xf000) >> 12) + 12);
> uint32_t boundary_count = boundary_chk - (s->sdmasysad % boundary_chk);
>
> + if (!(s->trnmod & SDHC_TRNS_BLK_CNT_EN) || !s->blkcnt) {
> + qemu_log_mask(LOG_UNIMP, "infinite transfer is not supported\n");
> + return;
> + }
> +
> /* XXX: Some sd/mmc drivers (for example, u-boot-slp) do not account for
> * possible stop at page boundary if initial address is not page aligned,
> * allow them to work properly */
> @@ -797,11 +802,6 @@ static void sdhci_data_transfer(void *opaque)
> if (s->trnmod & SDHC_TRNS_DMA) {
> switch (SDHC_DMA_TYPE(s->hostctl)) {
> case SDHC_CTRL_SDMA:
> - if ((s->trnmod & SDHC_TRNS_MULTI) &&
> - (!(s->trnmod & SDHC_TRNS_BLK_CNT_EN) || s->blkcnt == 0)) {
> - break;
> - }
> -
> if ((s->blkcnt == 1) || !(s->trnmod & SDHC_TRNS_MULTI)) {
> sdhci_sdma_transfer_single_block(s);
> } else {
> --
> 2.9.3
>