package/kernel/mac80211/patches/rt2x00/027-rt2800mmio-fetch-tx-status-changes.patch

   1 From f6a9618198e190a2ba09ce3f0aa8e9ee1763bd38 Mon Sep 17 00:00:00 2001
   2 From: Stanislaw Gruszka <sgruszka@redhat.com>
   3 Date: Sat, 9 Feb 2019 12:08:34 +0100
   4 X-Patchwork-Submitter: Stanislaw Gruszka <sgruszka@redhat.com>
   5 X-Patchwork-Id: 10804443
   6 X-Patchwork-Delegate: kvalo@adurom.com
   7 Subject: [PATCH 24/28] rt2800mmio: fetch tx status changes
   8
   9 Prepare to use rt2800mmio_fetch_txstatus() in concurrent manner and drop
  10 return value since is not longer needed.
  11
  12 Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
  13 ---
  14  drivers/net/wireless/ralink/rt2x00/rt2800mmio.c | 17 +++++++++--------
  15  1 file changed, 9 insertions(+), 8 deletions(-)
  16
  17 --- a/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
  18 +++ b/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
  19 @@ -255,12 +255,12 @@ void rt2800mmio_autowake_tasklet(unsigne
  20  }
  21  EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet);
  22
  23 -static bool rt2800mmio_fetch_txstatus(struct rt2x00_dev *rt2x00dev)
  24 +static void rt2800mmio_fetch_txstatus(struct rt2x00_dev *rt2x00dev)
  25  {
  26         u32 status;
  27 -       bool more = false;
  28 +       unsigned long flags;
  29
  30 -       /* FIXEME: rewrite this comment
  31 +       /*
  32          * The TX_FIFO_STATUS interrupt needs special care. We should
  33          * read TX_STA_FIFO but we should do it immediately as otherwise
  34          * the register can overflow and we would lose status reports.
  35 @@ -271,20 +271,21 @@ static bool rt2800mmio_fetch_txstatus(st
  36          * because we can schedule the tasklet multiple times (when the
  37          * interrupt fires again during tx status processing).
  38          *
  39 -        * txstatus tasklet is called with INT_SOURCE_CSR_TX_FIFO_STATUS
  40 -        * disabled so have only one producer and one consumer - we don't
  41 -        * need to lock the kfifo.
  42 +        * We also read statuses from tx status timeout timer, use
  43 +        * lock to prevent concurent writes to fifo.
  44          */
  45 +
  46 +       spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
  47 +
  48         while (!kfifo_is_full(&rt2x00dev->txstatus_fifo)) {
  49                 status = rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO);
  50                 if (!rt2x00_get_field32(status, TX_STA_FIFO_VALID))
  51                         break;
  52
  53                 kfifo_put(&rt2x00dev->txstatus_fifo, status);
  54 -               more = true;
  55         }
  56
  57 -       return more;
  58 +       spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
  59  }
  60
  61  void rt2800mmio_txstatus_tasklet(unsigned long data)