2019-02-13 18:47:18 +00:00
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From f6a9618198e190a2ba09ce3f0aa8e9ee1763bd38 Mon Sep 17 00:00:00 2001
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From: Stanislaw Gruszka <sgruszka@redhat.com>
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Date: Sat, 9 Feb 2019 12:08:34 +0100
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2019-03-01 02:34:40 +00:00
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X-Patchwork-Submitter: Stanislaw Gruszka <sgruszka@redhat.com>
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X-Patchwork-Id: 10804443
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X-Patchwork-Delegate: kvalo@adurom.com
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2019-02-13 18:47:18 +00:00
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Subject: [PATCH 24/28] rt2800mmio: fetch tx status changes
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Prepare to use rt2800mmio_fetch_txstatus() in concurrent manner and drop
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return value since is not longer needed.
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Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
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---
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drivers/net/wireless/ralink/rt2x00/rt2800mmio.c | 17 +++++++++--------
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1 file changed, 9 insertions(+), 8 deletions(-)
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--- a/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
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+++ b/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
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@@ -255,12 +255,12 @@ void rt2800mmio_autowake_tasklet(unsigne
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}
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EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet);
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-static bool rt2800mmio_fetch_txstatus(struct rt2x00_dev *rt2x00dev)
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+static void rt2800mmio_fetch_txstatus(struct rt2x00_dev *rt2x00dev)
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{
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u32 status;
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- bool more = false;
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+ unsigned long flags;
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- /* FIXEME: rewrite this comment
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+ /*
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* The TX_FIFO_STATUS interrupt needs special care. We should
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* read TX_STA_FIFO but we should do it immediately as otherwise
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* the register can overflow and we would lose status reports.
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@@ -271,20 +271,21 @@ static bool rt2800mmio_fetch_txstatus(st
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* because we can schedule the tasklet multiple times (when the
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* interrupt fires again during tx status processing).
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*
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- * txstatus tasklet is called with INT_SOURCE_CSR_TX_FIFO_STATUS
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- * disabled so have only one producer and one consumer - we don't
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- * need to lock the kfifo.
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+ * We also read statuses from tx status timeout timer, use
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+ * lock to prevent concurent writes to fifo.
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*/
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+
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+ spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
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+
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while (!kfifo_is_full(&rt2x00dev->txstatus_fifo)) {
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status = rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO);
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if (!rt2x00_get_field32(status, TX_STA_FIFO_VALID))
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break;
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kfifo_put(&rt2x00dev->txstatus_fifo, status);
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- more = true;
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}
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- return more;
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+ spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
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}
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void rt2800mmio_txstatus_tasklet(unsigned long data)
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