On 2/6/2012 5:09 PM, Stanislaw Gruszka wrote:
wmb(), rmb() are not needed when writel(), readl() are used as accessors for MMIO. We use them indirectly via iowrite32(), ioread32(). What is needed mmiowb(), for synchronizing writes coming from different CPUs on PCIe bridge (see in patch comments). This fortunately is not needed on x86, where mmiowb() is just defined as compiler barrier. As iwlwifi devices are most likely not used on anything other than x86, this is not so important fix.
Technically, PCIe bridges can reorder writes as well, so we really need to do a dummy read somewhere -- we were discussing this internally recently as well.
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