p54spi: fix p54spi_tx_frame DMA transfer initiation and skb cleanup

p54spi_tx_frame wasn't waiting for HOST_ALLOWED in SPI_ADRS_DMA_WRITE_CTRL.
This resulted in frequent 'WR_READY timeout' on beacon resubmission.

Also don't free skb on error path, as it gets freed on p54spi_wq_tx.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 28 insertions, 28 deletions

diff --git a/drivers/net/wireless/p54/p54spi.c b/drivers/net/wireless/p54/p54spi.c
index bed894ae04b..f8af0961018 100644
--- a/drivers/net/wireless/p54/p54spi.c
+++ b/drivers/net/wireless/p54/p54spi.c
@@ -179,6 +179,25 @@ static int p54spi_wait_bit(struct p54s_priv *priv, u16 reg, __le32 bits)
         return 0;
 }
 
+static int p54spi_spi_write_dma(struct p54s_priv *priv, __le32 base,
+                                const void *buf, size_t len)
+{
+        p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL,
+                       cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE));
+
+        if (p54spi_wait_bit(priv, SPI_ADRS_DMA_WRITE_CTRL,
+                            cpu_to_le32(HOST_ALLOWED)) == 0) {
+                dev_err(&priv->spi->dev, "spi_write_dma not allowed "
+                        "to DMA write.");
+                return -EAGAIN;
+        }
+
+        p54spi_write16(priv, SPI_ADRS_DMA_WRITE_LEN, cpu_to_le16(len));
+        p54spi_write32(priv, SPI_ADRS_DMA_WRITE_BASE, base);
+        p54spi_spi_write(priv, SPI_ADRS_DMA_DATA, buf, len);
+        return 0;
+}
+
 static int p54spi_request_firmware(struct ieee80211_hw *dev)
 {
         struct p54s_priv *priv = dev->priv;
@@ -254,24 +273,11 @@ static int p54spi_upload_firmware(struct ieee80211_hw *dev)
         while (fw_len > 0) {
                 _fw_len = min_t(long, fw_len, SPI_MAX_PACKET_SIZE);
 
-                p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL,
-                               cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE));
-
-                if (p54spi_wait_bit(priv, SPI_ADRS_DMA_WRITE_CTRL,
-                                    cpu_to_le32(HOST_ALLOWED)) == 0) {
-                        dev_err(&priv->spi->dev, "fw_upload not allowed "
-                                "to DMA write.");
-                        err = -EAGAIN;
+                err = p54spi_spi_write_dma(priv, cpu_to_le32(
+                                           ISL38XX_DEV_FIRMWARE_ADDR + offset),
+                                           (fw + offset), _fw_len);
+                if (err < 0)
                         goto out;
-                }
-
-                p54spi_write16(priv, SPI_ADRS_DMA_WRITE_LEN,
-                               cpu_to_le16(_fw_len));
-                p54spi_write32(priv, SPI_ADRS_DMA_WRITE_BASE, cpu_to_le32(
-                                ISL38XX_DEV_FIRMWARE_ADDR + offset));
-
-                p54spi_spi_write(priv, SPI_ADRS_DMA_DATA,
-                                 (fw + offset), _fw_len);
 
                 fw_len -= _fw_len;
                 offset += _fw_len;
@@ -418,27 +424,21 @@ static irqreturn_t p54spi_interrupt(int irq, void *config)
 static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb)
 {
         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
-        struct p54s_dma_regs dma_regs;
         unsigned long timeout;
         int ret = 0;
         u32 ints;
 
         p54spi_wakeup(priv);
 
-        dma_regs.cmd = cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE);
-        dma_regs.len = cpu_to_le16(skb->len);
-        dma_regs.addr = hdr->req_id;
-
-        p54spi_spi_write(priv, SPI_ADRS_DMA_WRITE_CTRL, &dma_regs,
-                           sizeof(dma_regs));
-
-        p54spi_spi_write(priv, SPI_ADRS_DMA_DATA, skb->data, skb->len);
+        ret = p54spi_spi_write_dma(priv, hdr->req_id, skb->data, skb->len);
+        if (ret < 0)
+                goto out;
 
         timeout = jiffies + 2 * HZ;
         ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
         while (!(ints & SPI_HOST_INT_WR_READY)) {
                 if (time_after(jiffies, timeout)) {
-                        dev_err(&priv->spi->dev, "WR_READY timeout");
+                        dev_err(&priv->spi->dev, "WR_READY timeout\n");
                         ret = -1;
                         goto out;
                 }
@@ -448,9 +448,9 @@ static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb)
         p54spi_int_ack(priv, SPI_HOST_INT_WR_READY);
         p54spi_sleep(priv);
 
-out:
         if (FREE_AFTER_TX(skb))
                 p54_free_skb(priv->hw, skb);
+out:
         return ret;
 }