mac80211: rt2x00: remove obsolete patch

According to Stanislaw Gruszka the patch
    600-23-rt2x00-rt2800mmio-add-a-workaround-for-spurious-TX_F.patch
should be dropped.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

package/kernel/mac80211/patches/rt2x00/600-23-rt2x00-rt2800mmio-add-a-workaround-for-spurious-TX_F.patch

@@ -1,136 +0,0 @@
-From 5e67d4f8a46d19748b501c2ef86de3f50d3cfd51 Mon Sep 17 00:00:00 2001
-From: Gabor Juhos <juhosg@openwrt.org>
-Date: Sun, 24 Mar 2013 19:26:27 +0100
-Subject: [PATCH] rt2x00: rt2800mmio: add a workaround for spurious
- TX_FIFO_STATUS interrupts
-
-Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
----
- drivers/net/wireless/ralink/rt2x00/rt2800mmio.c |   72 +++++++++++++++++++++++++-----
- drivers/net/wireless/ralink/rt2x00/rt2x00.h     |    5 +++
- 2 files changed, 65 insertions(+), 12 deletions(-)
-
---- a/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
-+++ b/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
-@@ -424,9 +424,9 @@ void rt2800mmio_autowake_tasklet(unsigne
- }
- EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet);
- 
--static void rt2800mmio_txstatus_interrupt(struct rt2x00_dev *rt2x00dev)
-+static void rt2800mmio_txstatus_interrupt(struct rt2x00_dev *rt2x00dev,
-+					  u32 status)
- {
--	u32 status;
- 	int i;
- 
- 	/*
-@@ -447,29 +447,77 @@ static void rt2800mmio_txstatus_interrup
- 	 * Since we have only one producer and one consumer we don't
- 	 * need to lock the kfifo.
- 	 */
--	for (i = 0; i < rt2x00dev->tx->limit; i++) {
--		status = rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO);
--
--		if (!rt2x00_get_field32(status, TX_STA_FIFO_VALID))
--			break;
--
-+	i = 0;
-+	do {
- 		if (!kfifo_put(&rt2x00dev->txstatus_fifo, status)) {
--			rt2x00_warn(rt2x00dev, "TX status FIFO overrun, drop tx status report\n");
-+			rt2x00_warn(rt2x00dev,
-+				    "TX status FIFO overrun, drop TX status report\n");
- 			break;
- 		}
--	}
-+
-+		if (++i >= rt2x00dev->tx->limit)
-+			break;
-+
-+		status = rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO);
-+	} while (rt2x00_get_field32(status, TX_STA_FIFO_VALID));
- 
- 	/* Schedule the tasklet for processing the tx status. */
- 	tasklet_schedule(&rt2x00dev->txstatus_tasklet);
- }
- 
-+#define RT2800MMIO_TXSTATUS_IRQ_MAX_RETRIES	4
-+
-+static bool rt2800mmio_txstatus_is_spurious(struct rt2x00_dev *rt2x00dev,
-+					   u32 txstatus)
-+{
-+	if (likely(rt2x00_get_field32(txstatus, TX_STA_FIFO_VALID))) {
-+		rt2x00dev->txstatus_irq_retries = 0;
-+		return false;
-+	}
-+
-+	rt2x00dev->txstatus_irq_retries++;
-+
-+	/* Ensure that we don't go into an infinite IRQ loop. */
-+	if (rt2x00dev->txstatus_irq_retries >=
-+	    RT2800MMIO_TXSTATUS_IRQ_MAX_RETRIES) {
-+		rt2x00_warn(rt2x00dev,
-+			    "%u spurious TX_FIFO_STATUS interrupt(s)\n",
-+			    rt2x00dev->txstatus_irq_retries);
-+		rt2x00dev->txstatus_irq_retries = 0;
-+		return false;
-+	}
-+
-+	return true;
-+}
-+
- irqreturn_t rt2800mmio_interrupt(int irq, void *dev_instance)
- {
- 	struct rt2x00_dev *rt2x00dev = dev_instance;
- 	u32 reg, mask;
-+	u32 txstatus = 0;
- 
--	/* Read status and ACK all interrupts */
-+	/* Read status */
- 	reg = rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR);
-+
-+	if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) {
-+		/* Due to unknown reason the hardware generates a
-+		 * TX_FIFO_STATUS interrupt before the TX_STA_FIFO
-+		 * register contain valid data. Read the TX status
-+		 * here to see if we have to process the actual
-+		 * request.
-+		 */
-+		txstatus = rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO);
-+		if (rt2800mmio_txstatus_is_spurious(rt2x00dev, txstatus)) {
-+			/* Remove the TX_FIFO_STATUS bit so it won't be
-+			 * processed in this turn. The hardware will
-+			 * generate another IRQ for us.
-+			 */
-+			rt2x00_set_field32(&reg,
-+					   INT_SOURCE_CSR_TX_FIFO_STATUS, 0);
-+		}
-+	}
-+
-+	/* ACK interrupts */
- 	rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
- 
- 	if (!reg)
-@@ -486,7 +534,7 @@ irqreturn_t rt2800mmio_interrupt(int irq
- 	mask = ~reg;
- 
- 	if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) {
--		rt2800mmio_txstatus_interrupt(rt2x00dev);
-+		rt2800mmio_txstatus_interrupt(rt2x00dev, txstatus);
- 		/*
- 		 * Never disable the TX_FIFO_STATUS interrupt.
- 		 */
---- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h
-+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
-@@ -1000,6 +1000,11 @@ struct rt2x00_dev {
- 	int rf_channel;
- 
- 	/*
-+	 * Counter for tx status irq retries (rt2800pci).
-+	 */
-+	unsigned int txstatus_irq_retries;
-+
-+	/*
- 	 * Protect the interrupt mask register.
- 	 */
- 	spinlock_t irqmask_lock;