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path: root/drivers/spi/spidev.c
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Diffstat (limited to 'drivers/spi/spidev.c')
-rw-r--r--drivers/spi/spidev.c34
1 files changed, 11 insertions, 23 deletions
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index 92c909eed..c7de64171 100644
--- a/drivers/spi/spidev.c
+++ b/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;
}
@@ -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;
@@ -676,7 +663,7 @@ 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 +693,7 @@ 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);