Date: Tue, 08 Nov 2005 12:05:36 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: thierry@herbelot.com Cc: freebsd-current@freebsd.org Subject: Re: Attempting to sleep in interrupts Message-ID: <20051108.120536.90824853.imp@bsdimp.com> In-Reply-To: <200511081913.15042.thierry@herbelot.com> References: <20051107094655.GA76489@cirb503493.alcatel.com.au> <200511081913.15042.thierry@herbelot.com>
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In message: <200511081913.15042.thierry@herbelot.com>
Thierry Herbelot <thierry@herbelot.com> writes:
: I also see this kind of panic :
: fwohci0: fwohci_pci_suspend
: panic: trying to sleep while sleeping is prohibited
The root of this problem is:
...
: bus_generic_suspend(c1d6f000,3,1,101dc70,0) at bus_generic_suspend+0x4a
: acpi_SetSleepState(c1dd2080,3,0,cb70dc38,c0660a63) at acpi_SetSleepState+0x16a
: acpi_pm_func(0,c1dd2080,1,cb70dc80,c07e8d47) at acpi_pm_func+0x3a
: power_pm_suspend(1) at power_pm_suspend+0x23
: scgetc(c1f88800,2,c0669865,c1e7a900,c0997fa0) at scgetc+0x4ef
: sckbdevent(c0997fa0,0,c1f88800) at sckbdevent+0x1c8
: atkbd_intr(c0997fa0,0,cb70dcec,c0632c9a,c0997fa0) at atkbd_intr+0x20
: atkbdintr(c0997fa0) at atkbdintr+0x16
We're calling the entire suspend chain from an interrupt handler.
Granted, this interrupt hanlder is in an ithread, but we still
prohibit sleeping there.
The solution is to have power_pm_suspend call the callback function
using a taskqueue.
Warner
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