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[SPARC64]: Refine PCI strbuf ctx-based flush. 

The initial peek read PIO of the match register is just a waste.
Just do the flush writes first, as that is more efficient.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2005-05-31 19:13:52 -07:00
parent 7c963ad1d1
commit 88314ee73f
1 changed files with 3 additions and 5 deletions
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8
arch/sparc64/kernel/pci_iommu.c
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@ -422,14 +422,12 @@ static void pci_strbuf_flush(struct pci_strbuf *strbuf, struct pci_iommu *iommu,
flushreg = strbuf->strbuf_ctxflush;
matchreg = PCI_STC_CTXMATCH_ADDR(strbuf, ctx);
if (pci_iommu_read(matchreg) == 0)
goto do_flush_sync;
pci_iommu_write(flushreg, ctx);
if ((val = pci_iommu_read(matchreg)) == 0)
val = pci_iommu_read(matchreg);
val &= 0xffff;
if (!val)
goto do_flush_sync;
val &= 0xffff;
while (val) {
if (val & 0x1)
pci_iommu_write(flushreg, ctx);