Initial commit

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

@@ -0,0 +1,61 @@
+From f6a9618198e190a2ba09ce3f0aa8e9ee1763bd38 Mon Sep 17 00:00:00 2001
+From: Stanislaw Gruszka <sgruszka@redhat.com>
+Date: Sat, 9 Feb 2019 12:08:34 +0100
+X-Patchwork-Submitter: Stanislaw Gruszka <sgruszka@redhat.com>
+X-Patchwork-Id: 10804443
+X-Patchwork-Delegate: kvalo@adurom.com
+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)