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This bypasses the dmaengine core's own try_module_get() protection, leaving no guard against the k3-udma driver module being unloaded while a glue client still holds a live reference. Set ud->ddev.owner so the module can be identified, take a reference on it in of_xudma_dev_get() with try_module_get(), and add xudma_dev_put() to release it. Update k3_udma_glue_release_tx_chn() and k3_udma_glue_release_rx_chn() to call xudma_dev_put() when releasing their channels. Signed-off-by: Sai Sree Kartheek Adivi --- drivers/dma/ti/k3-udma-glue.c | 5 +++++ drivers/dma/ti/k3-udma-private.c | 16 ++++++++++++++++ drivers/dma/ti/k3-udma.c | 1 + drivers/dma/ti/k3-udma.h | 1 + 4 files changed, 23 insertions(+) diff --git a/drivers/dma/ti/k3-udma-glue.c b/drivers/dma/ti/k3-udma-glue.c index 70eaf7ee57e68..f9e2a1e1e0a50 100644 --- a/drivers/dma/ti/k3-udma-glue.c +++ b/drivers/dma/ti/k3-udma-glue.c @@ -466,6 +466,9 @@ void k3_udma_glue_release_tx_chn(struct k3_udma_glue_tx_channel *tx_chn) device_unregister(&tx_chn->common.chan_dev); tx_chn->common.chan_dev.parent = NULL; } + + if (!IS_ERR_OR_NULL(tx_chn->common.udmax)) + xudma_dev_put(tx_chn->common.udmax); } EXPORT_SYMBOL_GPL(k3_udma_glue_release_tx_chn); @@ -1260,6 +1263,8 @@ void k3_udma_glue_release_rx_chn(struct k3_udma_glue_rx_channel *rx_chn) device_unregister(&rx_chn->common.chan_dev); rx_chn->common.chan_dev.parent = NULL; } + + xudma_dev_put(rx_chn->common.udmax); } EXPORT_SYMBOL_GPL(k3_udma_glue_release_rx_chn); diff --git a/drivers/dma/ti/k3-udma-private.c b/drivers/dma/ti/k3-udma-private.c index 44c097fff5ee6..d2501e074bcfb 100644 --- a/drivers/dma/ti/k3-udma-private.c +++ b/drivers/dma/ti/k3-udma-private.c @@ -54,10 +54,26 @@ struct udma_dev *of_xudma_dev_get(struct device_node *np, const char *property) return ERR_PTR(-EPROBE_DEFER); } + /* + * Callers keep using ud (via function pointers stored in it, e.g. + * ud->psil_pair) after this call returns, bypassing the dmaengine + * core's own try_module_get() protection. Pin the owning driver's + * module here so it can't be unloaded out from under a live glue + * client; xudma_dev_put() releases it. + */ + if (!try_module_get(ud->ddev.owner)) + return ERR_PTR(-ENODEV); + return ud; } EXPORT_SYMBOL(of_xudma_dev_get); +void xudma_dev_put(struct udma_dev *ud) +{ + module_put(ud->ddev.owner); +} +EXPORT_SYMBOL(xudma_dev_put); + struct device *xudma_get_device(struct udma_dev *ud) { return ud->dev; diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c index ddedd51ab26d9..cb0bdfa825f5d 100644 --- a/drivers/dma/ti/k3-udma.c +++ b/drivers/dma/ti/k3-udma.c @@ -2700,6 +2700,7 @@ static int udma_probe(struct platform_device *pdev) } ud->ddev.dev = dev; + ud->ddev.owner = THIS_MODULE; ud->dev = dev; ud->psil_base = ud->match_data->psil_base; diff --git a/drivers/dma/ti/k3-udma.h b/drivers/dma/ti/k3-udma.h index 4dd597ef435b8..65243c9ad1346 100644 --- a/drivers/dma/ti/k3-udma.h +++ b/drivers/dma/ti/k3-udma.h @@ -656,6 +656,7 @@ int xudma_navss_psil_unpair(struct udma_dev *ud, u32 src_thread, u32 dst_thread); struct udma_dev *of_xudma_dev_get(struct device_node *np, const char *property); +void xudma_dev_put(struct udma_dev *ud); struct device *xudma_get_device(struct udma_dev *ud); struct k3_ringacc *xudma_get_ringacc(struct udma_dev *ud); u32 xudma_dev_get_psil_base(struct udma_dev *ud); -- 2.55.0