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spi: Fixes for v4.9

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A few small fixes for SPI, one core fix that only applies in cases where
 we're handling DT overlays and a couple of driver specific fixes:
 
  - Fix handling of error cases when instantiating DT overlays so we
    don't end up just ignoring devices that encountered an error during
    instantiation.
  - Avoid reading uninitialized data when handing spurious interrupts
    in the espi driver.
  - A driver specific fix for the dspi driver to fix a bad interaction
    with u-boot.
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Merge tag 'spi-fix-v4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi fixes from Mark Brown: "A few small fixes for SPI, one core fix
  that only applies in cases where we're handling DT overlays and a
  couple of driver specific fixes:

   - Fix handling of error cases when instantiating DT overlays so we
     don't end up just ignoring devices that encountered an error during
     instantiation.

   - Avoid reading uninitialized data when handing spurious interrupts
     in the espi driver.

   - A driver specific fix for the dspi driver to fix a bad interaction
     with u-boot"

* tag 'spi-fix-v4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: dspi: clear SPI_SR before enable interrupt
  spi: fsl-espi: avoid processing uninitalized data on error
  spi: mark device nodes only in case of successful instantiation
This commit is contained in:
Linus Torvalds 2016-10-31 11:54:11 -07:00
commit 0c183d92b2
3 changed files with 12 additions and 2 deletions
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7
drivers/spi/spi-fsl-dspi.c
View File

@ -70,6 +70,7 @@
#define SPI_SR 0x2c
#define SPI_SR_EOQF 0x10000000
#define SPI_SR_TCFQF 0x80000000
#define SPI_SR_CLEAR 0xdaad0000
#define SPI_RSER 0x30
#define SPI_RSER_EOQFE 0x10000000
@ -646,6 +647,11 @@ static const struct regmap_config dspi_regmap_config = {
.max_register = 0x88,
};
static void dspi_init(struct fsl_dspi *dspi)
{
regmap_write(dspi->regmap, SPI_SR, SPI_SR_CLEAR);
}
static int dspi_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@ -709,6 +715,7 @@ static int dspi_probe(struct platform_device *pdev)
return PTR_ERR(dspi->regmap);
}
dspi_init(dspi);
dspi->irq = platform_get_irq(pdev, 0);
if (dspi->irq < 0) {
dev_err(&pdev->dev, "can't get platform irq\n");

2
drivers/spi/spi-fsl-espi.c
View File

@ -458,7 +458,7 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
mspi->len -= rx_nr_bytes;
if (mspi->rx)
if (rx_nr_bytes && mspi->rx)
mspi->get_rx(rx_data, mspi);
}

5
drivers/spi/spi.c
View File

@ -1618,9 +1618,11 @@ static void of_register_spi_devices(struct spi_master *master)
if (of_node_test_and_set_flag(nc, OF_POPULATED))
continue;
spi = of_register_spi_device(master, nc);
if (IS_ERR(spi))
if (IS_ERR(spi)) {
dev_warn(&master->dev, "Failed to create SPI device for %s\n",
nc->full_name);
of_node_clear_flag(nc, OF_POPULATED);
}
}
}
#else
@ -3131,6 +3133,7 @@ static int of_spi_notify(struct notifier_block *nb, unsigned long action,
if (IS_ERR(spi)) {
pr_err("%s: failed to create for '%s'\n",
__func__, rd->dn->full_name);
of_node_clear_flag(rd->dn, OF_POPULATED);
return notifier_from_errno(PTR_ERR(spi));
}
break;