dmaengine: usb-dmac: fix endless loop in usb_dmac_chan_terminate_all()

This patch fixes an issue that list_for_each_entry() in
usb_dmac_chan_terminate_all() is possible to cause endless loop because
this will move own desc to the desc_freed. So, this driver should use
list_for_each_entry_safe() instead of list_for_each_entry().

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/sh/usb-dmac.c b/drivers/dma/sh/usb-dmac.c
index ebd8a5f..16fb330 100644 (file)
--- a/drivers/dma/sh/usb-dmac.c
+++ b/drivers/dma/sh/usb-dmac.c
@@ -448,7 +448,7 @@ usb_dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 static int usb_dmac_chan_terminate_all(struct dma_chan *chan)
 {
        struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan);
-       struct usb_dmac_desc *desc;
+       struct usb_dmac_desc *desc, *_desc;
        unsigned long flags;
        LIST_HEAD(head);
        LIST_HEAD(list);
@@ -459,7 +459,7 @@ static int usb_dmac_chan_terminate_all(struct dma_chan *chan)
        if (uchan->desc)
                uchan->desc = NULL;
        list_splice_init(&uchan->desc_got, &list);
-       list_for_each_entry(desc, &list, node)
+       list_for_each_entry_safe(desc, _desc, &list, node)
                list_move_tail(&desc->node, &uchan->desc_freed);
        spin_unlock_irqrestore(&uchan->vc.lock, flags);
        vchan_dma_desc_free_list(&uchan->vc, &head);