Re: [PATCH 3/5 v4] usb: pci-quirks: Protect the I/O port pair of SB800

[Boszormenyi Zoltan <zboszor@pr.hu>]

2017-06-22 15:21 keltezéssel, Zoltán Böszörményi írta:
> This patch uses the previously introduced macro called
> request_declared_muxed_region() to synchronize access to
> the I/O port pair 0xcd6 / 0xcd7 on SB800.
> 
> These I/O ports are also used by i2c-piix4 and sp5100_tco,
> so synchronization is necessary. The other drivers will also
> be modified to use the new macro in subsequest patched.
> 
> v1: Started with a common mutex in a C source file.
> 
> v2: Declared the common mutex in drivers/usb/host/pci-quirks.c
>      instead of in a common C file.
> 
> v3: Switched to using the new request_declared_muxed_region
>      macro.
> 
> v4: Fixed checkpatch.pl warnings and use the new
>      release_declared_region() macro.
> 
> Signed-off-by: Zoltán Böszörményi <zboszor@pr.hu>
> ---
>   drivers/usb/host/pci-quirks.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
> index a9a1e4c..593942a 100644
> --- a/drivers/usb/host/pci-quirks.c
> +++ b/drivers/usb/host/pci-quirks.c
> @@ -279,6 +279,8 @@ bool usb_amd_prefetch_quirk(void)
>   }
>   EXPORT_SYMBOL_GPL(usb_amd_prefetch_quirk);
>   
> +static struct resource sb800_res = DEFINE_RES_IO_NAMED(0xcd6, 2, "SB800 USB");
> +
>   /*
>    * The hardware normally enables the A-link power management feature, which
>    * lets the system lower the power consumption in idle states.
> @@ -314,11 +316,13 @@ static void usb_amd_quirk_pll(int disable)
>   	if (amd_chipset.sb_type.gen == AMD_CHIPSET_SB800 ||
>   			amd_chipset.sb_type.gen == AMD_CHIPSET_HUDSON2 ||
>   			amd_chipset.sb_type.gen == AMD_CHIPSET_BOLTON) {
> +		request_declared_muxed_region(&sb800_res);
>   		outb_p(AB_REG_BAR_LOW, 0xcd6);
>   		addr_low = inb_p(0xcd7);
>   		outb_p(AB_REG_BAR_HIGH, 0xcd6);
>   		addr_high = inb_p(0xcd7);
>   		addr = addr_high << 8 | addr_low;
> +		release_declared_region(&sb800_res);
>   
>   		outl_p(0x30, AB_INDX(addr));
>   		outl_p(0x40, AB_DATA(addr));
>