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suspectscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604150158"},"content":"From: Sanman Pradhan \n\nThe parent IRQ is registered via devm_request_threaded_irq() in\nprobe, so it is not released until after .remove() returns via devm\ncleanup. However, pca954x_cleanup() tears down the IRQ domain and\ndisposes the mappings during .remove().\n\nThe threaded IRQ handler reads the mux over SMBus and dispatches\nnested child IRQs via handle_nested_irq(irq_find_mapping(data->irq, i)).\nIf the handler fires while child adapters are being removed or after\nthe domain has been torn down, it operates on stale state.\n\nCall devm_free_irq() explicitly before removing child adapters and\ntearing down the IRQ domain so the handler is fully quiesced first.\n\npca954x_cleanup() is also used as the probe error-unwind path. The\nIRQ domain is created by pca954x_irq_setup() before the parent IRQ is\nrequested, so on mid-probe failures data->irq is non-NULL while no\nmanaged IRQ resource exists yet. Track whether the parent IRQ was\nsuccessfully requested and only call devm_free_irq() when that is the\ncase.\n\nFixes: f2114795f721 (\"i2c: mux: pca954x: Add interrupt controller support\")\nCc: stable@vger.kernel.org\nSigned-off-by: Sanman Pradhan \n---\n drivers/i2c/muxes/i2c-mux-pca954x.c | 8 ++++++++\n 1 file changed, 8 insertions(+)","diff":"diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c\nindex f0b8879ae5fa..c20a161e6a5b 100644\n--- a/drivers/i2c/muxes/i2c-mux-pca954x.c\n+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c\n@@ -116,6 +116,7 @@ struct pca954x {\n \tstruct irq_domain *irq;\n \tunsigned int irq_mask;\n \traw_spinlock_t lock;\n+\tbool irq_requested;\n \tstruct regulator *supply;\n \n \tstruct gpio_desc *reset_gpio;\n@@ -464,8 +465,14 @@ static int pca954x_irq_setup(struct i2c_mux_core *muxc)\n static void pca954x_cleanup(struct i2c_mux_core *muxc)\n {\n \tstruct pca954x *data = i2c_mux_priv(muxc);\n+\tstruct i2c_client *client = data->client;\n \tint c, irq;\n \n+\tif (data->irq && data->irq_requested) {\n+\t\tdevm_free_irq(&client->dev, client->irq, data);\n+\t\tdata->irq_requested = false;\n+\t}\n+\n \ti2c_mux_del_adapters(muxc);\n \n \tif (data->irq) {\n@@ -656,6 +663,7 @@ static int pca954x_probe(struct i2c_client *client)\n \t\t\t\t\t\t\"pca954x\", data);\n \t\tif (ret)\n \t\t\tgoto fail_cleanup;\n+\t\tdata->irq_requested = true;\n \t}\n \n \t/*\n","prefixes":["2/4"]}