hI Rafael:
            The following error log are produced by
acpi_evaluate_reference().
It found _DEP returned package with 0 element and return AE_BAD_DATA.

>From dsdt table, _DEP may return package with 0 in some cases.  Can we
make acpi_evaluate_reference() not produce the error log and let caller
check
the package length?  So far, only thermal and _DEP use the function.

            Method (_DEP, 0, NotSerialized)  // _DEP: Dependencies
            {
                ADBG ("SAT0 DEP Call")
                If ((OSYS >= 0x07DD))
                {
                    If (((S0ID == One) && ((PEPC & 0x03) != Zero)))
                    {
                        ADBG ("SAT0 DEP")
                        Return (Package (0x01)
                        {
                            PEPD
                        })
                    }
                }

                ADBG ("SAT0 DEP NULL")
                Return (Package (0x00) {})
            }



On 2014年12月12日 16:55, Huang Ying wrote:
> FYI, we noticed the changes on
>
> commit 40e7fcb19293cbdff02c74cb0668413480f82ea1 ("ACPI: Add _DEP support to fix battery issue on Asus T100TA")
>
> The dmesg is as follow and attached.
>
> [    1.332908] ACPI: Power Resource [PG00] (on)
> [    1.341096] ACPI: Power Resource [PG01] (on)
> [    1.349277] ACPI: Power Resource [PG02] (on)
> [    1.357600] ACPI: [Package] has zero elements (ffff880136a63ac0)
> [    1.364422] acpi LNXVIDEO:00: Failed to evaluate _DEP.
> [    1.379349] ACPI: [Package] has zero elements (ffff880136ac9080)
> [    1.386171] acpi device:2e: Failed to evaluate _DEP.
> [    1.393244] ACPI: [Package] has zero elements (ffff880136ac9140)
> [    1.400067] acpi INT3432:00: Failed to evaluate _DEP.
> [    1.408336] ACPI: [Package] has zero elements (ffff880136ac9700)
> [    1.415144] acpi INT3433:00: Failed to evaluate _DEP.
> [    1.425509] ACPI: [Package] has zero elements (ffff880136b47380)
> [    1.432333] acpi INT3434:00: Failed to evaluate _DEP.
> [    1.438566] ACPI: [Package] has zero elements (ffff880136b47500)
> [    1.445390] acpi INT3435:00: Failed to evaluate _DEP.
> [    1.451701] ACPI: [Package] has zero elements (ffff880136b47600)
> [    1.458526] acpi INT3436:00: Failed to evaluate _DEP.
> [    1.464734] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.471558] acpi INT3438:00: Failed to evaluate _DEP.
> [    1.477734] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.484556] acpi device:4b: Failed to evaluate _DEP.
> [    1.490566] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.497388] acpi device:4d: Failed to evaluate _DEP.
> [    1.503402] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.510226] acpi device:4f: Failed to evaluate _DEP.
> [    1.516237] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.523045] acpi device:51: Failed to evaluate _DEP.
> [    1.529055] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.535878] acpi device:53: Failed to evaluate _DEP.
> [    1.541898] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.548719] acpi device:55: Failed to evaluate _DEP.
> [    1.554724] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.561546] acpi device:57: Failed to evaluate _DEP.
> [    1.567545] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.574368] acpi device:59: Failed to evaluate _DEP.
> [    1.580116] ACPI: [Package] has zero elements (ffff880136b47700)
> [    1.586939] acpi device:5a: Failed to evaluate _DEP.
> [    1.593108] acpi ABCD0000:00: ACPI dock station (docks/bays count: 1)
> [    1.601756] ACPI: Power Resource [FN00] (off)
> [    1.606790] ACPI: Power Resource [FN01] (on)
>
> To reproduce:
>
> 	apt-get install ruby ruby-oj
> 	git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
> 	cd lkp-tests
> 	bin/setup-local job.yaml # the job file attached in this email
> 	bin/run-local   job.yaml
>
>
> Disclaimer:
> Results have been estimated based on internal Intel analysis and are provided
> for informational purposes only. Any difference in system hardware or software
> design or configuration may affect actual performance.
>
>
> Thanks,
> Fengguang
>
>
>
> _______________________________________________
> LKP mailing list
> LKP(a)linux.intel.com
>


-- 
Best regards
Tianyu Lan