firewire: ohci: add a comment on PHY reg access serialization (b14c369d) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/firewire/ohci.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -513,6 +513,12 @@ static inline void flush_writes(const struct fw_ohci *ohci)
		reg_read(ohci, OHCI1394_Version);
		}

		/*
		* Beware! read_phy_reg(), write_phy_reg(), update_phy_reg(), and
		* read_paged_phy_reg() require the caller to hold ohci->phy_reg_mutex.
		* In other words, only use ohci_read_phy_reg() and ohci_update_phy_reg()
		* directly. Exceptions are intrinsically serialized contexts like pci_probe.
		*/
		static int read_phy_reg(struct fw_ohci *ohci, int addr)
		{
		u32 val;