This is a note to let you know that I've just added the patch titled

iio: buffer-dmaengine: fix releasing dma channel on error

to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-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 84c65d8008764a8fb4e627ff02de01ec4245f2c4 Mon Sep 17 00:00:00 2001 From: David Lechner dlechner@baylibre.com Date: Tue, 23 Jul 2024 11:32:21 -0500 Subject: iio: buffer-dmaengine: fix releasing dma channel on error

If dma_get_slave_caps() fails, we need to release the dma channel before returning an error to avoid leaking the channel.

Fixes: 2d6ca60f3284 ("iio: Add a DMAengine framework based buffer") Signed-off-by: David Lechner dlechner@baylibre.com Link: https://patch.msgid.link/20240723-iio-fix-dmaengine-free-on-error-v1-1-2c7cb... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/buffer/industrialio-buffer-dmaengine.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c index 12aa1412dfa0..426cc614587a 100644 --- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c +++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c @@ -237,7 +237,7 @@ static struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,

ret = dma_get_slave_caps(chan, &caps); if (ret < 0) - goto err_free; + goto err_release;

/* Needs to be aligned to the maximum of the minimums */ if (caps.src_addr_widths) @@ -263,6 +263,8 @@ static struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,

return &dmaengine_buffer->queue.buffer;

+err_release: + dma_release_channel(chan); err_free: kfree(dmaengine_buffer); return ERR_PTR(ret);