Merge tag 'spi-v4.1-rc1' into spi-linus

spi: Fixes for v4.1

A few driver fixes plus two changes for the core, one to make the
setup_transfer() callback optional which fixes crashes in some drivers
which were updated to use new interfaces without apparent testing and
one to ensure we don't expose the data buffers we use for dummy
transfers to drivers which avoids potential issues with multiple
accesses to them or reuse.

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# gpg:                 aka "Mark Brown <broonie@debian.org>"
# gpg:                 aka "Mark Brown <broonie@kernel.org>"
# gpg:                 aka "Mark Brown <broonie@tardis.ed.ac.uk>"
# gpg:                 aka "Mark Brown <broonie@linaro.org>"
# gpg:                 aka "Mark Brown <Mark.Brown@linaro.org>"

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 198f96b..a132180 100644 (file)
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -78,6 +78,7 @@ config SPI_ATMEL
 config SPI_BCM2835
        tristate "BCM2835 SPI controller"
        depends on ARCH_BCM2835 || COMPILE_TEST
+       depends on GPIOLIB
        help
          This selects a driver for the Broadcom BCM2835 SPI master.
 

diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index f63864a..37875cf 100644 (file)
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -164,13 +164,12 @@ static int bcm2835_spi_transfer_one_poll(struct spi_master *master,
                                         unsigned long xfer_time_us)
 {
        struct bcm2835_spi *bs = spi_master_get_devdata(master);
-       unsigned long timeout = jiffies +
-               max(4 * xfer_time_us * HZ / 1000000, 2uL);
+       /* set timeout to 1 second of maximum polling */
+       unsigned long timeout = jiffies + HZ;
 
        /* enable HW block without interrupts */
        bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_TA);
 
-       /* set timeout to 4x the expected time, or 2 jiffies */
        /* loop until finished the transfer */
        while (bs->rx_len) {
                /* read from fifo as much as possible */

diff --git a/drivers/spi/spi-bitbang.c b/drivers/spi/spi-bitbang.c
index 5ef6638..840a498 100644 (file)
--- a/drivers/spi/spi-bitbang.c
+++ b/drivers/spi/spi-bitbang.c
@@ -180,7 +180,6 @@ int spi_bitbang_setup(struct spi_device *spi)
 {
        struct spi_bitbang_cs   *cs = spi->controller_state;
        struct spi_bitbang      *bitbang;
-       int                     retval;
        unsigned long           flags;
 
        bitbang = spi_master_get_devdata(spi->master);
@@ -197,9 +196,11 @@ int spi_bitbang_setup(struct spi_device *spi)
        if (!cs->txrx_word)
                return -EINVAL;
 
-       retval = bitbang->setup_transfer(spi, NULL);
-       if (retval < 0)
-               return retval;
+       if (bitbang->setup_transfer) {
+               int retval = bitbang->setup_transfer(spi, NULL);
+               if (retval < 0)
+                       return retval;
+       }
 
        dev_dbg(&spi->dev, "%s, %u nsec/bit\n", __func__, 2 * cs->nsecs);
 
@@ -295,9 +296,11 @@ static int spi_bitbang_transfer_one(struct spi_master *master,
 
                /* init (-1) or override (1) transfer params */
                if (do_setup != 0) {
-                       status = bitbang->setup_transfer(spi, t);
-                       if (status < 0)
-                               break;
+                       if (bitbang->setup_transfer) {
+                               status = bitbang->setup_transfer(spi, t);
+                               if (status < 0)
+                                       break;
+                       }
                        if (do_setup == -1)
                                do_setup = 0;
                }

diff --git a/drivers/spi/spi-fsl-cpm.c b/drivers/spi/spi-fsl-cpm.c
index 9c46a30..6f466ab 100644 (file)
--- a/drivers/spi/spi-fsl-cpm.c
+++ b/drivers/spi/spi-fsl-cpm.c
@@ -24,6 +24,7 @@
 #include <linux/of_address.h>
 #include <linux/spi/spi.h>
 #include <linux/types.h>
+#include <linux/platform_device.h>
 
 #include "spi-fsl-cpm.h"
 #include "spi-fsl-lib.h"
@@ -269,17 +270,6 @@ static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
        if (mspi->flags & SPI_CPM2) {
                pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
                out_be16(spi_base, pram_ofs);
-       } else {
-               struct spi_pram __iomem *pram = spi_base;
-               u16 rpbase = in_be16(&pram->rpbase);
-
-               /* Microcode relocation patch applied? */
-               if (rpbase) {
-                       pram_ofs = rpbase;
-               } else {
-                       pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
-                       out_be16(spi_base, pram_ofs);
-               }
        }
 
        iounmap(spi_base);
@@ -292,7 +282,6 @@ int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
        struct device_node *np = dev->of_node;
        const u32 *iprop;
        int size;
-       unsigned long pram_ofs;
        unsigned long bds_ofs;
 
        if (!(mspi->flags & SPI_CPM_MODE))
@@ -319,8 +308,21 @@ int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
                }
        }
 
-       pram_ofs = fsl_spi_cpm_get_pram(mspi);
-       if (IS_ERR_VALUE(pram_ofs)) {
+       if (mspi->flags & SPI_CPM1) {
+               struct resource *res;
+
+               res = platform_get_resource(to_platform_device(dev),
+                                           IORESOURCE_MEM, 1);
+               mspi->pram = devm_ioremap_resource(dev, res);
+       } else {
+               unsigned long pram_ofs = fsl_spi_cpm_get_pram(mspi);
+
+               if (IS_ERR_VALUE(pram_ofs))
+                       mspi->pram = NULL;
+               else
+                       mspi->pram = cpm_muram_addr(pram_ofs);
+       }
+       if (mspi->pram == NULL) {
                dev_err(dev, "can't allocate spi parameter ram\n");
                goto err_pram;
        }
@@ -346,8 +348,6 @@ int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
                goto err_dummy_rx;
        }
 
-       mspi->pram = cpm_muram_addr(pram_ofs);
-
        mspi->tx_bd = cpm_muram_addr(bds_ofs);
        mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd));
 
@@ -375,7 +375,8 @@ err_dummy_rx:
 err_dummy_tx:
        cpm_muram_free(bds_ofs);
 err_bds:
-       cpm_muram_free(pram_ofs);
+       if (!(mspi->flags & SPI_CPM1))
+               cpm_muram_free(cpm_muram_offset(mspi->pram));
 err_pram:
        fsl_spi_free_dummy_rx();
        return -ENOMEM;

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 4df8942..d1a5b9f 100644 (file)
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -1210,6 +1210,7 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master,
        struct omap2_mcspi      *mcspi;
        struct omap2_mcspi_dma  *mcspi_dma;
        struct spi_transfer     *t;
+       int status;
 
        spi = m->spi;
        mcspi = spi_master_get_devdata(master);
@@ -1229,7 +1230,8 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master,
                                        tx_buf ? "tx" : "",
                                        rx_buf ? "rx" : "",
                                        t->bits_per_word);
-                       return -EINVAL;
+                       status = -EINVAL;
+                       goto out;
                }
 
                if (m->is_dma_mapped || len < DMA_MIN_BYTES)
@@ -1241,7 +1243,8 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master,
                        if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
                                dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
                                                'T', len);
-                               return -EINVAL;
+                               status = -EINVAL;
+                               goto out;
                        }
                }
                if (mcspi_dma->dma_rx && rx_buf != NULL) {
@@ -1253,14 +1256,19 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master,
                                if (tx_buf != NULL)
                                        dma_unmap_single(mcspi->dev, t->tx_dma,
                                                        len, DMA_TO_DEVICE);
-                               return -EINVAL;
+                               status = -EINVAL;
+                               goto out;
                        }
                }
        }
 
        omap2_mcspi_work(mcspi, m);
+       /* spi_finalize_current_message() changes the status inside the
+        * spi_message, save the status here. */
+       status = m->status;
+out:
        spi_finalize_current_message(master);
-       return 0;
+       return status;
 }
 
 static int omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index d5d7d22..50910d8 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -583,6 +583,15 @@ static int spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
        rx_dev = master->dma_rx->device->dev;
 
        list_for_each_entry(xfer, &msg->transfers, transfer_list) {
+               /*
+                * Restore the original value of tx_buf or rx_buf if they are
+                * NULL.
+                */
+               if (xfer->tx_buf == master->dummy_tx)
+                       xfer->tx_buf = NULL;
+               if (xfer->rx_buf == master->dummy_rx)
+                       xfer->rx_buf = NULL;
+
                if (!master->can_dma(master, msg->spi, xfer))
                        continue;