linux-kernel - Re: pci_set_power_state() failure and breaking suspend

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Message-ID: <tkrat.1b479115136413cf@s5r6.in-berlin.de>
Date:	Wed, 25 Oct 2006 08:40:54 +0200 (CEST)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	linux1394-devel@...ts.sourceforge.net,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>
Subject: Re: pci_set_power_state() failure and breaking suspend

On 24 Okt, Benjamin Herrenschmidt wrote:
>> Recently, ohci1394 grew some "proper" error handling in its suspend
>> function, something that looks like:
>> 
>>         err = pci_set_power_state(pdev, pci_choose_state(pdev, state));
>>         if (err)
>>                 goto out;
...
> First, it breaks some old PowerBooks where the internal OHCI has no PM
> feature exposed on PCI....

What about the following? Could someone compile-test it with gcc4
and CONFIG_IEEE1394_VERBOSEDEBUG=n?



From: Stefan Richter <stefanr@...6.in-berlin.de>
Subject: ieee1394: ohci1394: revert fail on error in suspend

The error checks in the suspend code were too harsh and broke
suspend on some PPC_PMACs again which have extra platform code.

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
Index: linux/drivers/ieee1394/ohci1394.c
===================================================================
--- linux.orig/drivers/ieee1394/ohci1394.c	2006-10-25 08:26:44.000000000 +0200
+++ linux/drivers/ieee1394/ohci1394.c	2006-10-25 08:28:34.000000000 +0200
@@ -3553,11 +3553,16 @@ static int ohci1394_pci_suspend (struct 
 	int err;
 
 	err = pci_save_state(pdev);
-	if (err)
-		goto out;
+	if (err) {
+		printk(KERN_ERR "%s: pci_save_state failed with %d\n",
+		       OHCI1394_DRIVER_NAME, err);
+		return err;
+	}
 	err = pci_set_power_state(pdev, pci_choose_state(pdev, state));
+#ifdef OHCI1394_DEBUG
 	if (err)
-		goto out;
+		printk(KERN_DEBUG "pci_set_power_state failed %d\n", err);
+#endif /* OHCI1394_DEBUG */
 
 /* PowerMac suspend code comes last */
 #ifdef CONFIG_PPC_PMAC
@@ -3570,8 +3575,8 @@ static int ohci1394_pci_suspend (struct 
 			pmac_call_feature(PMAC_FTR_1394_ENABLE, of_node, 0, 0);
 	}
 #endif /* CONFIG_PPC_PMAC */
-out:
-	return err;
+
+	return 0;
 }
 #endif /* CONFIG_PM */
 


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