6.12-stable review patch. If anyone has any objections, please let me know.
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From: Guenter Roeck linux@roeck-us.net
Upstream commit b7cb9a034305 ("dmaengine: idxd: Fix refcount underflow on module unload") fixes a refcount underflow by replacing the call to idxd_cleanup() in the remove function with direct cleanup calls. That works fine upstream. However, upstream removed support for IOMMU_DEV_FEAT_IOPF, which is still supported in v6.12.y. The backport of commit b7cb9a034305 into v6.12.y misses the call to disable it. This results in a warning backtrace when unloading and reloading the module.
WARNING: CPU: 0 PID: 665849 at drivers/pci/ats.c:337 pci_reset_pri+0x4c/0x60 ... RIP: 0010:pci_reset_pri+0xa7/0x130
Add the missing cleanup call to fix the problem.
Fixes: ce81905bec91 ("dmaengine: idxd: Fix refcount underflow on module unload") Cc: Yi Sun yi.sun@intel.com Cc: Shuai Xue xueshuai@linux.alibaba.com Cc: Dave Jiang dave.jiang@intel.com Cc: Vinicius Costa Gomes vinicius.gomes@intel.com Cc: Vinod Koul vkoul@kernel.org Signed-off-by: Guenter Roeck linux@roeck-us.net Acked-by: Vinicius Costa Gomes vinicius.gomes@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/dma/idxd/init.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/dma/idxd/init.c +++ b/drivers/dma/idxd/init.c @@ -923,6 +923,8 @@ static void idxd_remove(struct pci_dev * idxd_cleanup_interrupts(idxd); if (device_pasid_enabled(idxd)) idxd_disable_system_pasid(idxd); + if (device_user_pasid_enabled(idxd)) + idxd_disable_sva(idxd->pdev); pci_iounmap(pdev, idxd->reg_base); put_device(idxd_confdev(idxd)); pci_disable_device(pdev);