Messages in this thread | | | Subject | Re: [PATCH]Teach drivers don't call may-sleep routines in resume code | From | Li Shaohua <> | Date | Fri, 19 Nov 2004 09:46:20 +0800 |
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On Wed, 2004-11-17 at 11:04, Li Shaohua wrote: > Hi, > We already found one driver (PCI link device driver) does the odd thing, so alert other drivers. > > Thanks, > Shaohua > > --- 2.6/Documentation/power/devices.txt.orig 2004-11-17 10:42:25.160212832 +0800 > +++ 2.6/Documentation/power/devices.txt 2004-11-17 10:46:11.070869192 +0800 > @@ -70,6 +70,9 @@ System devices will only be suspended wi > after all other devices have been suspended. On resume, they will be > resumed before any other devices, and also with interrupts disabled. > > +*CAUTION*: The resume methods of drivers (normal devices and system devices) > +should never use any may-sleep methods, since when resume from memory (S3), > +no task is running. Oops, the description isn't precise. Some may-sleep routines such as waiting a sempahore are ok in resume routines, but some (kmalloc) are bad. Please ignore it till I get a precise description.
Thanks, Shaohua
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