Joao Pinto e151ae1ee0 Avoid hw_desc array overrun in dw-axi-dmac ... [ Upstream commit 333e11bf47 ] I have a use case where nr_buffers = 3 and in which each descriptor is composed by 3 segments, resulting in the DMA channel descs_allocated to be 9. Since axi_desc_put() handles the hw_desc considering the descs_allocated, this scenario would result in a kernel panic (hw_desc array will be overrun). To fix this, the proposal is to add a new member to the axi_dma_desc structure, where we keep the number of allocated hw_descs (axi_desc_alloc()) and use it in axi_desc_put() to handle the hw_desc array correctly. Additionally I propose to remove the axi_chan_start_first_queued() call after completing the transfer, since it was identified that unbalance can occur (started descriptors can be interrupted and transfer ignored due to DMA channel not being enabled). Signed-off-by: Joao Pinto <jpinto@synopsys.com> Link: https://lore.kernel.org/r/1711536564-12919-1-git-send-email-jpinto@synopsys.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-06-27 13:49:04 +02:00
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dw-axi-dmac-platform.c	Avoid hw_desc array overrun in dw-axi-dmac	2024-06-27 13:49:04 +02:00
dw-axi-dmac.h	Avoid hw_desc array overrun in dw-axi-dmac	2024-06-27 13:49:04 +02:00
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