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usbehci: clean cache unconditionally before handing a buffer to the hardware

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even in the read case, we need to clean the cache
so the cpu will not flush out old changes while
the hardware updates the buffer.
This commit is contained in:
cinap_lenrek 2015-09-05 10:14:19 +02:00
parent 50850cf4b9
commit 6fb9ae8f43
1 changed files with 3 additions and 4 deletions
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7
sys/src/9/port/usbehci.c
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@ -2171,11 +2171,10 @@ epgettd(Ctlr *ctlr, Qio *io, int flags, void *a, int count, int maxpkt)
td->buff = (*ctlr->dmaalloc)(count+0x1000);
td->data = (uchar*)ROUND((uintptr)td->buff, 0x1000);
}
if(a != nil && count > 0){
if(a != nil && count > 0)
memmove(td->data, a, count);
if(ctlr->dmaflush != nil && td->buff != nil)
(*ctlr->dmaflush)(1, td->data, count);
}
if(ctlr->dmaflush != nil && td->buff != nil)
(*ctlr->dmaflush)(1, td->data, count);
pa = PADDR(td->data);
for(i = 0; i < nelem(td->buffer); i++){
td->buffer[i] = pa;