This is a note to let you know that I've just added the patch titled
iio: adc: mcp3422: fix locking scope
to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 3f1093d83d7164e4705e4232ccf76da54adfda85 Mon Sep 17 00:00:00 2001
From: Angelo Compagnucci angelo.compagnucci@gmail.com Date: Wed, 19 Aug 2020 09:55:25 +0200 Subject: iio: adc: mcp3422: fix locking scope
Locking should be held for the entire reading sequence involving setting the channel, waiting for the channel switch and reading from the channel. If not, reading from a channel can result mixing with the reading from another channel.
Fixes: 07914c84ba30 ("iio: adc: Add driver for Microchip MCP3422/3/4 high resolution ADC") Signed-off-by: Angelo Compagnucci angelo.compagnucci@gmail.com Link: https://lore.kernel.org/r/20200819075525.1395248-1-angelo.compagnucci@gmail.... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/adc/mcp3422.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c index 5f1706d1c3c0..219adac2384b 100644 --- a/drivers/iio/adc/mcp3422.c +++ b/drivers/iio/adc/mcp3422.c @@ -96,16 +96,12 @@ static int mcp3422_update_config(struct mcp3422 *adc, u8 newconfig) { int ret;
- mutex_lock(&adc->lock); - ret = i2c_master_send(adc->i2c, &newconfig, 1); if (ret > 0) { adc->config = newconfig; ret = 0; }
- mutex_unlock(&adc->lock); - return ret; }
@@ -138,6 +134,8 @@ static int mcp3422_read_channel(struct mcp3422 *adc, u8 config; u8 req_channel = channel->channel;
+ mutex_lock(&adc->lock); + if (req_channel != MCP3422_CHANNEL(adc->config)) { config = adc->config; config &= ~MCP3422_CHANNEL_MASK; @@ -150,7 +148,11 @@ static int mcp3422_read_channel(struct mcp3422 *adc, msleep(mcp3422_read_times[MCP3422_SAMPLE_RATE(adc->config)]); }
- return mcp3422_read(adc, value, &config); + ret = mcp3422_read(adc, value, &config); + + mutex_unlock(&adc->lock); + + return ret; }
static int mcp3422_read_raw(struct iio_dev *iio,