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    Subject[PATCH 5.7 205/477] staging: wfx: fix value of scan timeout
    Date
    From: Jérôme Pouiller <jerome.pouiller@silabs.com>

    [ Upstream commit 6598b12d6635e8e3060863b84c04e472546ee126 ]

    Before to start the scan request, the firmware signals (with a null
    frame) to the AP it won't be able to receive data. This frame can be
    long to send: up to 512TU. The current calculus of the scan timeout does
    not take into account this delay.

    Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
    Link: https://lore.kernel.org/r/20200515083325.378539-5-Jerome.Pouiller@silabs.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/staging/wfx/hif_tx.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/staging/wfx/hif_tx.c b/drivers/staging/wfx/hif_tx.c
    index 77bca43aca428..20b3045d76674 100644
    --- a/drivers/staging/wfx/hif_tx.c
    +++ b/drivers/staging/wfx/hif_tx.c
    @@ -268,7 +268,7 @@ int hif_scan(struct wfx_vif *wvif, struct cfg80211_scan_request *req,
    tmo_chan_bg = le32_to_cpu(body->max_channel_time) * USEC_PER_TU;
    tmo_chan_fg = 512 * USEC_PER_TU + body->probe_delay;
    tmo_chan_fg *= body->num_of_probe_requests;
    - tmo = chan_num * max(tmo_chan_bg, tmo_chan_fg);
    + tmo = chan_num * max(tmo_chan_bg, tmo_chan_fg) + 512 * USEC_PER_TU;

    wfx_fill_header(hif, wvif->id, HIF_REQ_ID_START_SCAN, buf_len);
    ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
    --
    2.25.1


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