[PATCH] i2c: tegra: Fix failure during probe deferral cleanup

Thierry Reding
2023-06-08T07:56:17Z

From: Thierry Reding <treding@nvidia.com>

If the driver fails to obtain a DMA channel, it will initiate cleanup
and try to release the DMA channel that couldn't be retrieved. This will
cause a crash because the cleanup will try to dereference an ERR_PTR()-
encoded error code.

However, there's nothing to clean up at this point yet, so we can avoid
this by simply propagating the error code.

Fixes: fcc8a89a1c83 ("i2c: tegra: Share same DMA channel for RX and TX")
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
drivers/i2c/busses/i2c-tegra.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index f155e9028f94..0eab199900ae 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -458,10 +458,8 @@ static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)
* with existing devicetrees.
*/
i2c_dev->dma_chan = dma_request_chan(i2c_dev->dev, "tx");
- if (IS_ERR(i2c_dev->dma_chan)) {
- err = PTR_ERR(i2c_dev->dma_chan);
- goto err_out;
- }
+ if (IS_ERR(i2c_dev->dma_chan))
+ return PTR_ERR(i2c_dev->dma_chan);

i2c_dev->dma_dev = i2c_dev->dma_chan->device->dev;
i2c_dev->dma_buf_size = i2c_dev->hw->quirks->max_write_len +
--
2.40.1