diff options
author | 2016-04-11 10:41:07 +0300 | |
---|---|---|
committer | 2016-04-13 08:17:18 +0300 | |
commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/spi/spidev.c | |
parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/spi/spidev.c')
-rw-r--r-- | kernel/drivers/spi/spidev.c | 48 |
1 files changed, 18 insertions, 30 deletions
diff --git a/kernel/drivers/spi/spidev.c b/kernel/drivers/spi/spidev.c index 92c909eed..d0e7dfc64 100644 --- a/kernel/drivers/spi/spidev.c +++ b/kernel/drivers/spi/spidev.c @@ -95,37 +95,25 @@ MODULE_PARM_DESC(bufsiz, "data bytes in biggest supported SPI message"); /*-------------------------------------------------------------------------*/ -/* - * We can't use the standard synchronous wrappers for file I/O; we - * need to protect against async removal of the underlying spi_device. - */ -static void spidev_complete(void *arg) -{ - complete(arg); -} - static ssize_t spidev_sync(struct spidev_data *spidev, struct spi_message *message) { DECLARE_COMPLETION_ONSTACK(done); int status; - - message->complete = spidev_complete; - message->context = &done; + struct spi_device *spi; spin_lock_irq(&spidev->spi_lock); - if (spidev->spi == NULL) + spi = spidev->spi; + spin_unlock_irq(&spidev->spi_lock); + + if (spi == NULL) status = -ESHUTDOWN; else - status = spi_async(spidev->spi, message); - spin_unlock_irq(&spidev->spi_lock); + status = spi_sync(spi, message); + + if (status == 0) + status = message->actual_length; - if (status == 0) { - wait_for_completion(&done); - status = message->status; - if (status == 0) - status = message->actual_length; - } return status; } @@ -614,11 +602,11 @@ static int spidev_open(struct inode *inode, struct file *filp) if (!spidev->tx_buffer) { spidev->tx_buffer = kmalloc(bufsiz, GFP_KERNEL); if (!spidev->tx_buffer) { - dev_dbg(&spidev->spi->dev, "open/ENOMEM\n"); - status = -ENOMEM; + dev_dbg(&spidev->spi->dev, "open/ENOMEM\n"); + status = -ENOMEM; goto err_find_dev; - } } + } if (!spidev->rx_buffer) { spidev->rx_buffer = kmalloc(bufsiz, GFP_KERNEL); @@ -647,7 +635,6 @@ err_find_dev: static int spidev_release(struct inode *inode, struct file *filp) { struct spidev_data *spidev; - int status = 0; mutex_lock(&device_list_lock); spidev = filp->private_data; @@ -664,10 +651,11 @@ static int spidev_release(struct inode *inode, struct file *filp) kfree(spidev->rx_buffer); spidev->rx_buffer = NULL; - spidev->speed_hz = spidev->spi->max_speed_hz; + spin_lock_irq(&spidev->spi_lock); + if (spidev->spi) + spidev->speed_hz = spidev->spi->max_speed_hz; /* ... after we unbound from the underlying device? */ - spin_lock_irq(&spidev->spi_lock); dofree = (spidev->spi == NULL); spin_unlock_irq(&spidev->spi_lock); @@ -676,7 +664,7 @@ static int spidev_release(struct inode *inode, struct file *filp) } mutex_unlock(&device_list_lock); - return status; + return 0; } static const struct file_operations spidev_fops = { @@ -706,6 +694,7 @@ static struct class *spidev_class; #ifdef CONFIG_OF static const struct of_device_id spidev_dt_ids[] = { { .compatible = "rohm,dh2228fv" }, + { .compatible = "lineartechnology,ltc2488" }, {}, }; MODULE_DEVICE_TABLE(of, spidev_dt_ids); @@ -721,7 +710,7 @@ static int spidev_probe(struct spi_device *spi) /* * spidev should never be referenced in DT without a specific - * compatbile string, it is a Linux implementation thing + * compatible string, it is a Linux implementation thing * rather than a description of the hardware. */ if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) { @@ -799,7 +788,6 @@ static int spidev_remove(struct spi_device *spi) static struct spi_driver spidev_spi_driver = { .driver = { .name = "spidev", - .owner = THIS_MODULE, .of_match_table = of_match_ptr(spidev_dt_ids), }, .probe = spidev_probe, |