firewire: ohci: add a comment on PHY reg access serialization
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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@ -513,6 +513,12 @@ static inline void flush_writes(const struct fw_ohci *ohci)
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reg_read(ohci, OHCI1394_Version);
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reg_read(ohci, OHCI1394_Version);
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}
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}
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/*
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* Beware! read_phy_reg(), write_phy_reg(), update_phy_reg(), and
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* read_paged_phy_reg() require the caller to hold ohci->phy_reg_mutex.
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* In other words, only use ohci_read_phy_reg() and ohci_update_phy_reg()
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* directly. Exceptions are intrinsically serialized contexts like pci_probe.
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*/
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static int read_phy_reg(struct fw_ohci *ohci, int addr)
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static int read_phy_reg(struct fw_ohci *ohci, int addr)
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{
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{
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u32 val;
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u32 val;
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