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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Smatch static checker warns: drivers/iommu/amd/iommu_v2.c:133 free_device_state() warn: sleeping in atomic context Fixes by storing the list of struct device_state in a temporary list, and then free the memory after releasing the spinlock. Reported-by: Dan Carpenter Fixes: dc6a709e5123 ("iommu/amd: Improve amd_iommu_v2_exit()") Signed-off-by: Suravee Suthikulpanit --- drivers/iommu/amd/iommu_v2.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c index 490da41c3c71..5a6e4f87d875 100644 --- a/drivers/iommu/amd/iommu_v2.c +++ b/drivers/iommu/amd/iommu_v2.c @@ -947,6 +947,7 @@ static void __exit amd_iommu_v2_exit(void) { struct device_state *dev_state, *next; unsigned long flags; + LIST_HEAD(freelist); if (!amd_iommu_v2_supported()) return; @@ -966,11 +967,20 @@ static void __exit amd_iommu_v2_exit(void) put_device_state(dev_state); list_del(&dev_state->list); - free_device_state(dev_state); + list_add_tail(&dev_state->list, &freelist); } spin_unlock_irqrestore(&state_lock, flags); + /* + * Since free_device_state waits on the count to be zero, + * we need to free dev_state outside the spinlock. + */ + list_for_each_entry_safe(dev_state, next, &freelist, list) { + list_del(&dev_state->list); + free_device_state(dev_state); + } + destroy_workqueue(iommu_wq); } -- 2.17.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu