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spi: spidev: Don't mangle max_speed_hz in underlying spi device 

Currently spidev allows callers to set the default speed by overriding the
max_speed_hz in the underlying device. This achieves the immediate goal but
is not what devices expect and can easily lead to userspace trying to set
unsupported speeds and succeeding, apart from anything else drivers can't
set a limit on the speed using max_speed_hz as they'd expect and any other
devices on the bus will be affected.

Instead store the default speed in the spidev struct and fill this in on
each transfer.

Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2014-11-08 10:28:10 +00:00
parent 0df1f2487d
commit 9169051617
1 changed files with 13 additions and 3 deletions
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16
drivers/spi/spidev.c
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@ -87,6 +87,7 @@ struct spidev_data {
unsigned users;
u8 *tx_buffer;
u8 *rx_buffer;
u32 speed_hz;
};
static LIST_HEAD(device_list);
@ -138,6 +139,7 @@ spidev_sync_write(struct spidev_data *spidev, size_t len)
struct spi_transfer t = {
.tx_buf = spidev->tx_buffer,
.len = len,
.speed_hz = spidev->speed_hz,
};
struct spi_message m;
@ -152,6 +154,7 @@ spidev_sync_read(struct spidev_data *spidev, size_t len)
struct spi_transfer t = {
.rx_buf = spidev->rx_buffer,
.len = len,
.speed_hz = spidev->speed_hz,
};
struct spi_message m;
@ -274,6 +277,8 @@ static int spidev_message(struct spidev_data *spidev,
k_tmp->bits_per_word = u_tmp->bits_per_word;
k_tmp->delay_usecs = u_tmp->delay_usecs;
k_tmp->speed_hz = u_tmp->speed_hz;
if (!k_tmp->speed_hz)
k_tmp->speed_hz = spidev->speed_hz;
#ifdef VERBOSE
dev_dbg(&spidev->spi->dev,
" xfer len %zd %s%s%s%dbits %u usec %uHz\n",
@ -377,7 +382,7 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
retval = __put_user(spi->bits_per_word, (__u8 __user *)arg);
break;
case SPI_IOC_RD_MAX_SPEED_HZ:
retval = __put_user(spi->max_speed_hz, (__u32 __user *)arg);
retval = __put_user(spidev->speed_hz, (__u32 __user *)arg);
break;
/* write requests */
@ -441,10 +446,11 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
spi->max_speed_hz = tmp;
retval = spi_setup(spi);
if (retval < 0)
spi->max_speed_hz = save;
if (retval >= 0)
spidev->speed_hz = tmp;
else
dev_dbg(&spi->dev, "%d Hz (max)\n", tmp);
spi->max_speed_hz = save;
}
break;
@ -570,6 +576,8 @@ 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;
/* ... after we unbound from the underlying device? */
spin_lock_irq(&spidev->spi_lock);
dofree = (spidev->spi == NULL);
@ -650,6 +658,8 @@ static int spidev_probe(struct spi_device *spi)
}
mutex_unlock(&device_list_lock);
spidev->speed_hz = spi->max_speed_hz;
if (status == 0)
spi_set_drvdata(spi, spidev);
else