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dmaengine: idxd: Do not call DMX TX callbacks during workqueue disable 

On driver unload any pending descriptors are flushed and pending
DMA descriptors are explicitly completed:
idxd_dmaengine_drv_remove() ->
	drv_disable_wq() ->
		idxd_wq_free_irq() ->
			idxd_flush_pending_descs() ->
				idxd_dma_complete_txd()

With this done during driver unload any remaining descriptor is
likely stuck and can be dropped. Even so, the descriptor may still
have a callback set that could no longer be accessible. An
example of such a problem is when the dmatest fails and the dmatest
module is unloaded. The failure of dmatest leaves descriptors with
dma_async_tx_descriptor::callback pointing to code that no longer
exist. This causes a page fault as below at the time the IDXD driver
is unloaded when it attempts to run the callback:
 BUG: unable to handle page fault for address: ffffffffc0665190
 #PF: supervisor instruction fetch in kernel mode
 #PF: error_code(0x0010) - not-present page

Fix this by clearing the callback pointers on the transmit
descriptors only when workqueue is disabled.

Fixes: 403a2e2365 ("dmaengine: idxd: change MSIX allocation based on per wq activation")
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/37d06b772aa7f8863ca50f90930ea2fd80b38fc3.1670452419.git.reinette.chatre@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Reinette Chatre 2022-12-07 14:52:22 -08:00 committed by Vinod Koul
parent 1beeec45f9
commit 6744a030d8
1 changed files with 11 additions and 0 deletions
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11
drivers/dma/idxd/device.c
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@ -1172,8 +1172,19 @@ static void idxd_flush_pending_descs(struct idxd_irq_entry *ie)
spin_unlock(&ie->list_lock);
list_for_each_entry_safe(desc, itr, &flist, list) {
struct dma_async_tx_descriptor *tx;
list_del(&desc->list);
ctype = desc->completion->status ? IDXD_COMPLETE_NORMAL : IDXD_COMPLETE_ABORT;
/*
* wq is being disabled. Any remaining descriptors are
* likely to be stuck and can be dropped. callback could
* point to code that is no longer accessible, for example
* if dmatest module has been unloaded.
*/
tx = &desc->txd;
tx->callback = NULL;
tx->callback_result = NULL;
idxd_dma_complete_txd(desc, ctype, true);
}
}