Merge tag 'spi-fix-v4.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi fixes from Mark Brown:
 "A couple of driver specific fixes here that came in since the merge
  window plus one core fix for locking in cases where a client driver
  grabs a lock on the whole bus for an extended series of operations
  that was introduced by the changes to support accelerated flash
  operations"

* tag 'spi-fix-v4.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: rockchip: fix probe deferral handling
  spi: omap2-mcspi: fix dma transfer for vmalloced buffer
  spi: fix possible deadlock between internal bus locks and bus_lock_flag
  spi: imx: Fix possible NULL pointer deref
  spi: imx: only do necessary changes to ECSPIx_CONFIGREG
  spi: rockchip: Spelling s/divsor/divisor/

4 files changed, 43 insertions, 55 deletions

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index e7a19be87c38..50769078e72e 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -211,11 +211,15 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
                          struct spi_transfer *transfer)
 {
         struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
-        unsigned int bpw = transfer->bits_per_word;
+        unsigned int bpw;
 
         if (!master->dma_rx)
                 return false;
 
+        if (!transfer)
+                return false;
+
+        bpw = transfer->bits_per_word;
         if (!bpw)
                 bpw = spi->bits_per_word;
 
@@ -333,8 +337,9 @@ static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
 static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
                 struct spi_imx_config *config)
 {
-        u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0;
+        u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
         u32 clk = config->speed_hz, delay, reg;
+        u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
 
         /*
          * The hardware seems to have a race condition when changing modes. The
@@ -358,13 +363,20 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
 
         if (config->mode & SPI_CPHA)
                 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
+        else
+                cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
 
         if (config->mode & SPI_CPOL) {
                 cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
                 cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
+        } else {
+                cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
+                cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
         }
         if (config->mode & SPI_CS_HIGH)
                 cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
+        else
+                cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(config->cs);
 
         if (spi_imx->usedma)
                 ctrl |= MX51_ECSPI_CTRL_SMC;
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 0caa3c8bef46..43a02e377b3b 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -423,16 +423,12 @@ static void omap2_mcspi_tx_dma(struct spi_device *spi,
 
         if (mcspi_dma->dma_tx) {
                 struct dma_async_tx_descriptor *tx;
-                struct scatterlist sg;
 
                 dmaengine_slave_config(mcspi_dma->dma_tx, &cfg);
 
-                sg_init_table(&sg, 1);
-                sg_dma_address(&sg) = xfer->tx_dma;
-                sg_dma_len(&sg) = xfer->len;
-
-                tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1,
-                DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+                tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, xfer->tx_sg.sgl,
+                                             xfer->tx_sg.nents, DMA_MEM_TO_DEV,
+                                             DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
                 if (tx) {
                         tx->callback = omap2_mcspi_tx_callback;
                         tx->callback_param = spi;
@@ -478,20 +474,15 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
 
         if (mcspi_dma->dma_rx) {
                 struct dma_async_tx_descriptor *tx;
-                struct scatterlist sg;
 
                 dmaengine_slave_config(mcspi_dma->dma_rx, &cfg);
 
                 if ((l & OMAP2_MCSPI_CHCONF_TURBO) && mcspi->fifo_depth == 0)
                         dma_count -= es;
 
-                sg_init_table(&sg, 1);
-                sg_dma_address(&sg) = xfer->rx_dma;
-                sg_dma_len(&sg) = dma_count;
-
-                tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, &sg, 1,
-                                DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT |
-                                DMA_CTRL_ACK);
+                tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, xfer->rx_sg.sgl,
+                                             xfer->rx_sg.nents, DMA_DEV_TO_MEM,
+                                             DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
                 if (tx) {
                         tx->callback = omap2_mcspi_rx_callback;
                         tx->callback_param = spi;
@@ -505,8 +496,6 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
         omap2_mcspi_set_dma_req(spi, 1, 1);
 
         wait_for_completion(&mcspi_dma->dma_rx_completion);
-        dma_unmap_single(mcspi->dev, xfer->rx_dma, count,
-                         DMA_FROM_DEVICE);
 
         if (mcspi->fifo_depth > 0)
                 return count;
@@ -619,8 +608,6 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
 
         if (tx != NULL) {
                 wait_for_completion(&mcspi_dma->dma_tx_completion);
-                dma_unmap_single(mcspi->dev, xfer->tx_dma, xfer->len,
-                                 DMA_TO_DEVICE);
 
                 if (mcspi->fifo_depth > 0) {
                         irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS;
@@ -1087,6 +1074,16 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
                 gpio_free(spi->cs_gpio);
 }
 
+static bool omap2_mcspi_can_dma(struct spi_master *master,
+                                struct spi_device *spi,
+                                struct spi_transfer *xfer)
+{
+        if (xfer->len < DMA_MIN_BYTES)
+                return false;
+
+        return true;
+}
+
 static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi,
                 struct spi_device *spi, struct spi_transfer *t)
 {
@@ -1268,32 +1265,6 @@ static int omap2_mcspi_transfer_one(struct spi_master *master,
                 return -EINVAL;
         }
 
-        if (len < DMA_MIN_BYTES)
-                goto skip_dma_map;
-
-        if (mcspi_dma->dma_tx && tx_buf != NULL) {
-                t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
-                                len, DMA_TO_DEVICE);
-                if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
-                        dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
-                                        'T', len);
-                        return -EINVAL;
-                }
-        }
-        if (mcspi_dma->dma_rx && rx_buf != NULL) {
-                t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
-                                DMA_FROM_DEVICE);
-                if (dma_mapping_error(mcspi->dev, t->rx_dma)) {
-                        dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
-                                        'R', len);
-                        if (tx_buf != NULL)
-                                dma_unmap_single(mcspi->dev, t->tx_dma,
-                                                len, DMA_TO_DEVICE);
-                        return -EINVAL;
-                }
-        }
-
-skip_dma_map:
         return omap2_mcspi_work_one(mcspi, spi, t);
 }
 
@@ -1377,6 +1348,7 @@ static int omap2_mcspi_probe(struct platform_device *pdev)
         master->transfer_one = omap2_mcspi_transfer_one;
         master->set_cs = omap2_mcspi_set_cs;
         master->cleanup = omap2_mcspi_cleanup;
+        master->can_dma = omap2_mcspi_can_dma;
         master->dev.of_node = node;
         master->max_speed_hz = OMAP2_MCSPI_MAX_FREQ;
         master->min_speed_hz = OMAP2_MCSPI_MAX_FREQ >> 15;
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 8f50a4020f6f..6c6c0013ec7a 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -534,7 +534,7 @@ static void rockchip_spi_config(struct rockchip_spi *rs)
         if (WARN_ON(rs->speed > MAX_SCLK_OUT))
                 rs->speed = MAX_SCLK_OUT;
 
-        /* the minimum divsor is 2 */
+        /* the minimum divisor is 2 */
         if (rs->max_freq < 2 * rs->speed) {
                 clk_set_rate(rs->spiclk, 2 * rs->speed);
                 rs->max_freq = clk_get_rate(rs->spiclk);
@@ -730,23 +730,27 @@ static int rockchip_spi_probe(struct platform_device *pdev)
         master->transfer_one = rockchip_spi_transfer_one;
         master->handle_err = rockchip_spi_handle_err;
 
-        rs->dma_tx.ch = dma_request_slave_channel(rs->dev, "tx");
-        if (IS_ERR_OR_NULL(rs->dma_tx.ch)) {
+        rs->dma_tx.ch = dma_request_chan(rs->dev, "tx");
+        if (IS_ERR(rs->dma_tx.ch)) {
                 /* Check tx to see if we need defer probing driver */
                 if (PTR_ERR(rs->dma_tx.ch) == -EPROBE_DEFER) {
                         ret = -EPROBE_DEFER;
                         goto err_get_fifo_len;
                 }
                 dev_warn(rs->dev, "Failed to request TX DMA channel\n");
+                rs->dma_tx.ch = NULL;
         }
 
-        rs->dma_rx.ch = dma_request_slave_channel(rs->dev, "rx");
-        if (!rs->dma_rx.ch) {
-                if (rs->dma_tx.ch) {
+        rs->dma_rx.ch = dma_request_chan(rs->dev, "rx");
+        if (IS_ERR(rs->dma_rx.ch)) {
+                if (PTR_ERR(rs->dma_rx.ch) == -EPROBE_DEFER) {
                         dma_release_channel(rs->dma_tx.ch);
                         rs->dma_tx.ch = NULL;
+                        ret = -EPROBE_DEFER;
+                        goto err_get_fifo_len;
                 }
                 dev_warn(rs->dev, "Failed to request RX DMA channel\n");
+                rs->dma_rx.ch = NULL;
         }
 
         if (rs->dma_tx.ch && rs->dma_rx.ch) {
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index de2f2f90d799..0239b45eed92 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1209,7 +1209,7 @@ static void spi_pump_messages(struct kthread_work *work)
         struct spi_master *master =
                 container_of(work, struct spi_master, pump_messages);
 
-        __spi_pump_messages(master, true, false);
+        __spi_pump_messages(master, true, master->bus_lock_flag);
 }
 
 static int spi_init_queue(struct spi_master *master)
@@ -2853,7 +2853,7 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message,
  */
 int spi_sync(struct spi_device *spi, struct spi_message *message)
 {
-        return __spi_sync(spi, message, 0);
+        return __spi_sync(spi, message, spi->master->bus_lock_flag);
 }
 EXPORT_SYMBOL_GPL(spi_sync);