There's no need to hold the channel lock when freeing the memset buf, as the operation has already completed. Free the memset buf without holding the channel lock.
Fixes: 4d112426c344 ("dmaengine: hdmac: Add memset capabilities") Reported-by: Peter Rosin peda@axentia.se Signed-off-by: Tudor Ambarus tudor.ambarus@microchip.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se... --- drivers/dma/at_hdmac.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index b3184da7ced4..c2b3d7b63920 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -897,13 +897,6 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc) if (!atc_chan_is_cyclic(atchan)) dma_cookie_complete(txd);
- /* If the transfer was a memset, free our temporary buffer */ - if (desc->memset_buffer) { - dma_pool_free(atdma->memset_pool, desc->memset_vaddr, - desc->memset_paddr); - desc->memset_buffer = false; - } - /* Remove transfer node from the active list. */ list_del_init(&desc->desc_node); spin_unlock_irqrestore(&atchan->lock, flags); @@ -922,6 +915,13 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc) /* add myself to free_list */ list_add(&desc->desc_node, &atchan->free_list); spin_unlock_irqrestore(&atchan->lock, flags); + + /* If the transfer was a memset, free our temporary buffer */ + if (desc->memset_buffer) { + dma_pool_free(atdma->memset_pool, desc->memset_vaddr, + desc->memset_paddr); + desc->memset_buffer = false; + } }
/**