lkml.org 
[lkml]   [2020]   [Oct]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH] net: ftgmac100: Fix missing TX-poll issue
On Mon, 19 Oct 2020 08:57:03 +0000 Joel Stanley wrote:
> > diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
> > index 00024dd41147..9a99a87f29f3 100644
> > --- a/drivers/net/ethernet/faraday/ftgmac100.c
> > +++ b/drivers/net/ethernet/faraday/ftgmac100.c
> > @@ -804,7 +804,8 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb,
> > * before setting the OWN bit on the first descriptor.
> > */
> > dma_wmb();
> > - first->txdes0 = cpu_to_le32(f_ctl_stat);
> > + WRITE_ONCE(first->txdes0, cpu_to_le32(f_ctl_stat));
> > + READ_ONCE(first->txdes0);
>
> I understand what you're trying to do here, but I'm not sure that this
> is the correct way to go about it.
>
> It does cause the compiler to produce a store and then a load.

+1 @first is system memory from dma_alloc_coherent(), right?

You shouldn't have to do this. Is coherent DMA memory broken
on your platform?

\
 
 \ /
  Last update: 2020-10-19 21:01    [W:0.082 / U:1.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site