6.6-stable review patch. If anyone has any objections, please let me know.
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From: Yi Sun yi.sun@intel.com
[ Upstream commit b7cb9a034305d52222433fad10c3de10204f29e7 ]
A recent refactor introduced a misplaced put_device() call, resulting in a reference count underflow during module unload.
There is no need to add additional put_device() calls for idxd groups, engines, or workqueues. Although the commit claims: "Note, this also fixes the missing put_device() for idxd groups, engines, and wqs."
It appears no such omission actually existed. The required cleanup is already handled by the call chain: idxd_unregister_devices() -> device_unregister() -> put_device()
Extend idxd_cleanup() to handle the remaining necessary cleanup and remove idxd_cleanup_internals(), which duplicates deallocation logic for idxd, engines, groups, and workqueues. Memory management is also properly handled through the Linux device model.
Fixes: a409e919ca32 ("dmaengine: idxd: Refactor remove call with idxd_cleanup() helper") Signed-off-by: Yi Sun yi.sun@intel.com Tested-by: Shuai Xue xueshuai@linux.alibaba.com Reviewed-by: Dave Jiang dave.jiang@intel.com Acked-by: Vinicius Costa Gomes vinicius.gomes@intel.com
Link: https://lore.kernel.org/r/20250729150313.1934101-3-yi.sun@intel.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/idxd/init.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c index 3a78973882211..163a276d2670e 100644 --- a/drivers/dma/idxd/init.c +++ b/drivers/dma/idxd/init.c @@ -904,7 +904,10 @@ static void idxd_remove(struct pci_dev *pdev) device_unregister(idxd_confdev(idxd)); idxd_shutdown(pdev); idxd_device_remove_debugfs(idxd); - idxd_cleanup(idxd); + perfmon_pmu_remove(idxd); + idxd_cleanup_interrupts(idxd); + if (device_pasid_enabled(idxd)) + idxd_disable_system_pasid(idxd); pci_iounmap(pdev, idxd->reg_base); put_device(idxd_confdev(idxd)); pci_disable_device(pdev);