[PATCH 2/2] iio: buffer-dma: fix type of 'i' in iio_dma_buffer_alloc_blocks()

[Alexandru Ardelean]

When unwinding the cleanup of the blocks, the type of 'i' is important to
be signed, so that the 'i >= 0' condition doesn't underflow and infinitely
loop (or just cause an access violation).

Fixes: ab925b044cfb ("iio: buffer-dma: Add mmap support")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
---
 drivers/iio/buffer/industrialio-buffer-dma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/iio/buffer/industrialio-buffer-dma.c b/drivers/iio/buffer/industrialio-buffer-dma.c
index d04479194cb4..83074d060535 100644
--- a/drivers/iio/buffer/industrialio-buffer-dma.c
+++ b/drivers/iio/buffer/industrialio-buffer-dma.c
@@ -707,8 +707,7 @@ int iio_dma_buffer_alloc_blocks(struct iio_buffer *buffer,
 	struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buffer);
 	struct iio_dma_buffer_block **blocks;
 	unsigned int num_blocks;
-	unsigned int i;
-	int ret = 0;
+	int i, ret = 0;
 
 	mutex_lock(&queue->lock);
 
-- 
2.27.0