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

This makes the SPI core and its users access transfers in the SPI message
structure as linked list not as an array, as discussed on LKML.

From: David Brownell <dbrownell@users.sourceforge.net>

  Updates including doc, bugfixes to the list code, add
  spi_message_add_tail().  Plus, initialize things _before_ grabbing the
  locks in some cases (in case it grows more expensive).  This also merges
  some bitbang updates of mine that didn't yet make it into the mm tree.

Signed-off-by: Vitaly Wool <vwool@ru.mvista.com>
Signed-off-by: Dmitry Pervushin <dpervushin@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 17 insertions, 11 deletions

diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index a39b3b6b266c..99d3a0320fc9 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -147,7 +147,7 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
 {
         struct dataflash        *priv = (struct dataflash *)mtd->priv;
         struct spi_device       *spi = priv->spi;
-        struct spi_transfer     x[1] = { { .tx_dma = 0, }, };
+        struct spi_transfer     x = { .tx_dma = 0, };
         struct spi_message      msg;
         unsigned                blocksize = priv->page_size << 3;
         u8                      *command;
@@ -162,10 +162,11 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
                         || (instr->addr % priv->page_size) != 0)
                 return -EINVAL;
 
-        x[0].tx_buf = command = priv->command;
-        x[0].len = 4;
-        msg.transfers = x;
-        msg.n_transfer = 1;
+        spi_message_init(&msg);
+
+        x.tx_buf = command = priv->command;
+        x.len = 4;
+        spi_message_add_tail(&x, &msg);
 
         down(&priv->lock);
         while (instr->len > 0) {
@@ -256,12 +257,15 @@ static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len,
         DEBUG(MTD_DEBUG_LEVEL3, "READ: (%x) %x %x %x\n",
                 command[0], command[1], command[2], command[3]);
 
+        spi_message_init(&msg);
+
         x[0].tx_buf = command;
         x[0].len = 8;
+        spi_message_add_tail(&x[0], &msg);
+
         x[1].rx_buf = buf;
         x[1].len = len;
-        msg.transfers = x;
-        msg.n_transfer = 2;
+        spi_message_add_tail(&x[1], &msg);
 
         down(&priv->lock);
 
@@ -320,9 +324,11 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
         if ((to + len) > mtd->size)
                 return -EINVAL;
 
+        spi_message_init(&msg);
+
         x[0].tx_buf = command = priv->command;
         x[0].len = 4;
-        msg.transfers = x;
+        spi_message_add_tail(&x[0], &msg);
 
         pageaddr = ((unsigned)to / priv->page_size);
         offset = ((unsigned)to % priv->page_size);
@@ -364,7 +370,6 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
                         DEBUG(MTD_DEBUG_LEVEL3, "TRANSFER: (%x) %x %x %x\n",
                                 command[0], command[1], command[2], command[3]);
 
-                        msg.n_transfer = 1;
                         status = spi_sync(spi, &msg);
                         if (status < 0)
                                 DEBUG(MTD_DEBUG_LEVEL1, "%s: xfer %u -> %d \n",
@@ -385,14 +390,16 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
 
                 x[1].tx_buf = writebuf;
                 x[1].len = writelen;
-                msg.n_transfer = 2;
+                spi_message_add_tail(x + 1, &msg);
                 status = spi_sync(spi, &msg);
+                spi_transfer_del(x + 1);
                 if (status < 0)
                         DEBUG(MTD_DEBUG_LEVEL1, "%s: pgm %u/%u -> %d \n",
                                 spi->dev.bus_id, addr, writelen, status);
 
                 (void) dataflash_waitready(priv->spi);
 
+
 #ifdef  CONFIG_DATAFLASH_WRITE_VERIFY
 
                 /* (3) Compare to Buffer1 */
@@ -405,7 +412,6 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
                 DEBUG(MTD_DEBUG_LEVEL3, "COMPARE: (%x) %x %x %x\n",
                         command[0], command[1], command[2], command[3]);
 
-                msg.n_transfer = 1;
                 status = spi_sync(spi, &msg);
                 if (status < 0)
                         DEBUG(MTD_DEBUG_LEVEL1, "%s: compare %u -> %d \n",