Handle a race between device_pager and devsw in a more graceful manner:
return an error code rather than panic the kernel. Sponsored by: Sandvine Incorporated Reviewed by: kib Tested by: pho MFC after: 2 weeks
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=223823
@ -217,8 +217,10 @@ dev_pager_getpages(object, m, count, reqpage)
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memattr = object->memattr;
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VM_OBJECT_UNLOCK(object);
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csw = dev_refthread(dev, &ref);
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if (csw == NULL)
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panic("dev_pager_getpage: no cdevsw");
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if (csw == NULL) {
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VM_OBJECT_LOCK(object);
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return (VM_PAGER_FAIL);
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}
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td = curthread;
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fpop = td->td_fpop;
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td->td_fpop = NULL;
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