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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>
This commit is contained in:
Yoshihiro Shimoda 2015-11-12 13:37:40 +09:00 committed by Vinod Koul
parent 8005c49d9a
commit d9f5efade2
1 changed files with 2 additions and 2 deletions
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4
drivers/dma/sh/usb-dmac.c
View File

@ -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);