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