From: Dave Jiang dave.jiang@intel.com
commit 44c4237cf3436bda2b185ff728123651ad133f69 upstream.
Testing shown that when a wq mode is setup to be dedicated and then torn down and reconfigured to shared, the wq configured end up being dedicated anyays. The root cause is when idxd_device_wqs_clear_state() gets called during idxd_driver removal, idxd_wq_disable_cleanup() does not get called vs when the wq driver is removed first. The check of wq state being "enabled" causes the cleanup to be bypassed. However, idxd_driver->remove() releases all wq drivers. So the wqs goes to "disabled" state and will never be "enabled". By that point, the driver has no idea if the wq was previously configured or clean. So force call idxd_wq_disable_cleanup() on all wqs always to make sure everything gets cleaned up.
Reported-by: Tony Zhu tony.zhu@intel.com Tested-by: Tony Zhu tony.zhu@intel.com Fixes: 0dcfe41e9a4c ("dmanegine: idxd: cleanup all device related bits after disabling device") Signed-off-by: Dave Jiang dave.jiang@intel.com Co-developed-by: Fenghua Yu fenghua.yu@intel.com Signed-off-by: Fenghua Yu fenghua.yu@intel.com Link: https://lore.kernel.org/r/20220628230056.2527816-1-fenghua.yu@intel.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/dma/idxd/device.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-)
--- a/drivers/dma/idxd/device.c +++ b/drivers/dma/idxd/device.c @@ -720,10 +720,7 @@ static void idxd_device_wqs_clear_state( for (i = 0; i < idxd->max_wqs; i++) { struct idxd_wq *wq = idxd->wqs[i];
- if (wq->state == IDXD_WQ_ENABLED) { - idxd_wq_disable_cleanup(wq); - wq->state = IDXD_WQ_DISABLED; - } + idxd_wq_disable_cleanup(wq); idxd_wq_device_reset_cleanup(wq); } }