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SubjectDo not suspend PCI devices twice [PATCH for testing]
Hi!

PCI devices are suspendend twice; once using pm_send_all() and once
because of driver model (when using ACPI). That's bad.

If I kill pm_send_all() hook, they will not be suspended at all with
APM, because APM does not call device_suspend(...,
SUSPEND_SAVE_STATE). This patch fixes both of these.

Ouch, no it does not. You should > drivers/pci/power.c. Its no longer
needed.

It compiles, and I'd like someone to test it ;-).
Pavel

--- /usr/src/tmp/linux/arch/i386/kernel/apm.c 2003-05-27 13:42:28.000000000 +0200
+++ /usr/src/linux/arch/i386/kernel/apm.c 2003-08-04 23:11:06.000000000 +0200
@@ -1185,19 +1185,23 @@
int err;
struct apm_user *as;

+ if (device_suspend(3, SUSPEND_NOTIFY))
+ if (vetoable)
+ goto veto;
+ if (device_suspend(3, SUSPEND_SAVE_STATE)) {
+ if (vetoable) {
+ device_resume(RESUME_RESTORE_STATE);
+ goto veto;
+ }
+ }
if (pm_send_all(PM_SUSPEND, (void *)3)) {
/* Vetoed */
if (vetoable) {
- if (apm_info.connection_version > 0x100)
- set_system_power_state(APM_STATE_REJECT);
- err = -EBUSY;
- ignore_sys_suspend = 0;
- printk(KERN_WARNING "apm: suspend was vetoed.\n");
- goto out;
+ device_resume(RESUME_RESTORE_STATE);
+ goto veto;
}
printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
}
-
device_suspend(3, SUSPEND_POWER_DOWN);

/* serialize with the timer interrupt */
@@ -1234,7 +1238,17 @@
err = (err == APM_SUCCESS) ? 0 : -EIO;
device_resume(RESUME_POWER_ON);
pm_send_all(PM_RESUME, (void *)0);
+ device_resume(RESUME_RESTORE_STATE);
queue_event(APM_NORMAL_RESUME, NULL);
+
+ if (0) {
+ veto:
+ if (apm_info.connection_version > 0x100)
+ set_system_power_state(APM_STATE_REJECT);
+ err = -EBUSY;
+ ignore_sys_suspend = 0;
+ printk(KERN_WARNING "apm: suspend was vetoed.\n");
+ }
out:
spin_lock(&user_list_lock);
for (as = user_list; as != NULL; as = as->next) {
--- /usr/src/tmp/linux/drivers/pci/power.c 2003-06-15 22:42:54.000000000 +0200
+++ /usr/src/linux/drivers/pci/power.c 2003-08-04 21:22:38.000000000 +0200
@@ -157,3 +157,4 @@
}

subsys_initcall(pci_pm_init);
+
diff -ur -x '.dep*' -x '.hdep*' -x '*.[oas]' -x '*~' -x '#*' -x '*CVS*' -x '*.orig' -x '*.rej' -x '*.old' -x '.menu*' -x asm -x local.h -x System.map -x autoconf.h -x compile.h -x version.h -x .version -x defkeymap.c -x uni_hash.tbl -x zImage -x vmlinux -x vmlinuz -x TAGS -x bootsect -x '*RCS*' -x conmakehash -x map -x build -x build -x configure -x '*target*' -x '*.flags' -x '*.bak' -x '*.cmd' /usr/src/tmp/linux/drivers/pci/probe.c /usr/src/linux/drivers/pci/probe.c
--- /usr/src/tmp/linux/drivers/pci/probe.c 2003-07-11 21:38:38.000000000 +0200
+++ /usr/src/linux/drivers/pci/probe.c 2003-07-31 12:19:04.000000000 +0200
@@ -633,6 +633,9 @@
return max;
}

+struct device_driver pci_driver = {
+};
+
struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, int bus, struct pci_ops *ops, void *sysdata)
{
struct pci_bus *b;
@@ -664,6 +667,7 @@
b->dev->parent = parent;
sprintf(b->dev->bus_id,"pci%04x:%02x", pci_domain_nr(b), bus);
strcpy(b->dev->name,"Host/PCI Bridge");
+ b->dev->driver = &pci_driver;
device_register(b->dev);

b->number = b->secondary = bus;
diff -ur -x '.dep*' -x '.hdep*' -x '*.[oas]' -x '*~' -x '#*' -x '*CVS*' -x '*.orig' -x '*.rej' -x '*.old' -x '.menu*' -x asm -x local.h -x System.map -x autoconf.h -x compile.h -x version.h -x .version -x defkeymap.c -x uni_hash.tbl -x zImage -x vmlinux -x vmlinuz -x TAGS -x bootsect -x '*RCS*' -x conmakehash -x map -x build -x build -x configure -x '*target*' -x '*.flags' -x '*.bak' -x '*.cmd' /usr/src/tmp/linux/drivers/usb/core/hcd.c /usr/src/linux/drivers/usb/core/hcd.c
--- /usr/src/tmp/linux/drivers/usb/core/hcd.c 2003-07-27 22:31:27.000000000 +0200
+++ /usr/src/linux/drivers/usb/core/hcd.c 2003-07-31 11:31:06.000000000 +0200
@@ -1487,8 +1487,26 @@

static void hcd_panic (void *_hcd)
{
- struct usb_hcd *hcd = _hcd;
- hcd->driver->stop (hcd);
+ struct usb_hcd *hcd = _hcd;
+ struct usb_device *hub = hcd->self.root_hub;
+
+ hub = usb_get_dev (hub);
+ usb_disconnect (&hub);
+
+ /* FIXME either try to restart, or arrange to clean up the
+ * hc-internal state, like usb_hcd_pci_remove() does
+ */
+}
+
+void mark_gone (struct usb_device *dev)
+{
+ unsigned i;
+
+ dev->state = USB_STATE_NOTATTACHED;
+ for (i = 0; i < dev->maxchild; i++) {
+ if (dev->children [i])
+ mark_gone (dev->children [i]);
+ }
}

/**
@@ -1501,29 +1519,12 @@
*/
void usb_hc_died (struct usb_hcd *hcd)
{
- struct list_head *devlist, *urblist;
- struct hcd_dev *dev;
- struct urb *urb;
- unsigned long flags;
-
- /* flag every pending urb as done */
- spin_lock_irqsave (&hcd_data_lock, flags);
- list_for_each (devlist, &hcd->dev_list) {
- dev = list_entry (devlist, struct hcd_dev, dev_list);
- list_for_each (urblist, &dev->urb_list) {
- urb = list_entry (urblist, struct urb, urb_list);
- dev_dbg (hcd->controller, "shutdown %s urb %p pipe %x, current status %d\n",
- hcd->self.bus_name, urb, urb->pipe, urb->status);
- if (urb->status == -EINPROGRESS)
- urb->status = -ESHUTDOWN;
- }
- }
- urb = (struct urb *) hcd->rh_timer.data;
- if (urb)
- urb->status = -ESHUTDOWN;
- spin_unlock_irqrestore (&hcd_data_lock, flags);
+ dev_err (hcd->controller, "HC died; pending I/O will be aborted.\n");

- /* hcd->stop() needs a task context */
+ /* prevent new submissions to devices in this tree */
+ mark_gone (hcd->self.root_hub);
+
+ /* then usb_disconnect() them all, in a task context */
INIT_WORK (&hcd->work, hcd_panic, hcd);
(void) schedule_work (&hcd->work);
}
diff -ur -x '.dep*' -x '.hdep*' -x '*.[oas]' -x '*~' -x '#*' -x '*CVS*' -x '*.orig' -x '*.rej' -x '*.old' -x '.menu*' -x asm -x local.h -x System.map -x autoconf.h -x compile.h -x version.h -x .version -x defkeymap.c -x uni_hash.tbl -x zImage -x vmlinux -x vmlinuz -x TAGS -x bootsect -x '*RCS*' -x conmakehash -x map -x build -x build -x configure -x '*target*' -x '*.flags' -x '*.bak' -x '*.cmd' /usr/src/tmp/linux/drivers/usb/host/ohci-pci.c /usr/src/linux/drivers/usb/host/ohci-pci.c
--- /usr/src/tmp/linux/drivers/usb/host/ohci-pci.c 2003-04-21 22:31:45.000000000 +0200
+++ /usr/src/linux/drivers/usb/host/ohci-pci.c 2003-07-31 11:31:06.000000000 +0200
@@ -199,6 +199,11 @@
int retval = 0;
unsigned long flags;

+ if (hcd->state == USB_STATE_HALT) {
+ ohci_dbg (ohci, "USB restart of halted device\n");
+ return -EL3HLT;
+ }
+
#ifdef CONFIG_PMAC_PBOOK
{
struct device_node *of_node;
Only in /usr/src/linux/drivers/video/logo: logo_linux_clut224.c
Only in /usr/src/linux/include/asm-i386: asm_offsets.h
Only in /usr/src/linux/include: config
diff -ur -x '.dep*' -x '.hdep*' -x '*.[oas]' -x '*~' -x '#*' -x '*CVS*' -x '*.orig' -x '*.rej' -x '*.old' -x '.menu*' -x asm -x local.h -x System.map -x autoconf.h -x compile.h -x version.h -x .version -x defkeymap.c -x uni_hash.tbl -x zImage -x vmlinux -x vmlinuz -x TAGS -x bootsect -x '*RCS*' -x conmakehash -x map -x build -x build -x configure -x '*target*' -x '*.flags' -x '*.bak' -x '*.cmd' /usr/src/tmp/linux/kernel/suspend.c /usr/src/linux/kernel/suspend.c
--- /usr/src/tmp/linux/kernel/suspend.c 2003-08-04 23:13:49.000000000 +0200
+++ /usr/src/linux/kernel/suspend.c 2003-08-04 23:07:11.000000000 +0200
@@ -630,16 +630,20 @@
static void drivers_unsuspend(void)
{
device_resume(RESUME_RESTORE_STATE);
+ pm_send_all(PM_RESUME, (void *)0);
device_resume(RESUME_ENABLE);
}

/* Called from process context */
static int drivers_suspend(void)
{
- device_suspend(4, SUSPEND_NOTIFY);
- device_suspend(4, SUSPEND_SAVE_STATE);
- device_suspend(4, SUSPEND_DISABLE);
- if(!pm_suspend_state) {
+ if (device_suspend(4, SUSPEND_NOTIFY))
+ return -EIO;
+ if (device_suspend(4, SUSPEND_SAVE_STATE)) {
+ device_resume(RESUME_RESTORE_STATE);
+ return -EIO;
+ }
+ if (!pm_suspend_state) {
if(pm_send_all(PM_SUSPEND,(void *)3)) {
printk(KERN_WARNING "Problem while sending suspend event\n");
return(1);
@@ -647,6 +651,7 @@
pm_suspend_state=1;
} else
printk(KERN_WARNING "PM suspend state already raised\n");
+ device_suspend(4, SUSPEND_DISABLE);

return(0);
}
@@ -868,7 +873,7 @@
blk_run_queues();

/* Save state of all device drivers, and stop them. */
- if(drivers_suspend()==0)
+ if (drivers_suspend()==0)
/* If stopping device drivers worked, we proceed basically into
* suspend_save_image.
*
Only in /usr/src/linux/lib: crc32table.h
Only in /usr/src/linux/lib: gen_crc32table
Only in /usr/src/linux: patches
Only in /usr/src/linux/scripts: docproc
Only in /usr/src/linux/scripts: elfconfig.h
Only in /usr/src/linux/scripts: fixdep
Only in /usr/src/linux/scripts: kallsyms
Only in /usr/src/linux/scripts/kconfig: conf
Only in /usr/src/linux/scripts/kconfig: lex.zconf.c
Only in /usr/src/linux/scripts/kconfig: libkconfig.so
Only in /usr/src/linux/scripts/kconfig: zconf.tab.c
Only in /usr/src/linux/scripts/kconfig: zconf.tab.h
Only in /usr/src/linux/scripts: mk_elfconfig
Only in /usr/src/linux/scripts: modpost
Only in /usr/src/linux/scripts: pnmtologo
Only in /usr/src/linux/scripts: split-include
Only in /usr/src/linux: txt
Only in /usr/src/linux/usr: gen_init_cpio
Only in /usr/src/linux/usr: initramfs_data.cpio
Only in /usr/src/linux/usr: initramfs_data.cpio.gz
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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