[PATCH] spi: use linked lists rather than an array

[linux-beck.git] / drivers / spi / spi.c

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 3ecedccdb96cc7e605262fa318c17194b7ce381c..cdb242de901d1c1036ded5cb17410874ef917457 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -557,6 +557,17 @@ int spi_write_then_read(struct spi_device *spi,
        if ((n_tx + n_rx) > SPI_BUFSIZ)
                return -EINVAL;
 
+       spi_message_init(&message);
+       memset(x, 0, sizeof x);
+       if (n_tx) {
+               x[0].len = n_tx;
+               spi_message_add_tail(&x[0], &message);
+       }
+       if (n_rx) {
+               x[1].len = n_rx;
+               spi_message_add_tail(&x[1], &message);
+       }
+
        /* ... unless someone else is using the pre-allocated buffer */
        if (down_trylock(&lock)) {
                local_buf = kmalloc(SPI_BUFSIZ, GFP_KERNEL);
@@ -565,18 +576,11 @@ int spi_write_then_read(struct spi_device *spi,
        } else
                local_buf = buf;
 
-       memset(x, 0, sizeof x);
-
        memcpy(local_buf, txbuf, n_tx);
        x[0].tx_buf = local_buf;
-       x[0].len = n_tx;
-
        x[1].rx_buf = local_buf + n_tx;
-       x[1].len = n_rx;
 
        /* do the i/o */
-       message.transfers = x;
-       message.n_transfer = ARRAY_SIZE(x);
        status = spi_sync(spi, &message);
        if (status == 0) {
                memcpy(rxbuf, x[1].rx_buf, n_rx);