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spi: Fixes for v4.6 

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.
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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/
This commit is contained in:
Linus Torvalds 2016-04-05 13:41:37 -07:00
parent 1b5caa3eaa cb39f732ab
commit 5003bc6cc6
4 changed files with 43 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/spi/spi-imx.c
View File

@ -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;

62
drivers/spi/spi-omap2-mcspi.c
View File

@ -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;

16
drivers/spi/spi-rockchip.c
View File

@ -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) {

4
drivers/spi/spi.c
View File

@ -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);