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Date: Sun, 1 Nov 2009 17:47:36 +0100
From: Dominik Brodowski <linux@...inikbrodowski.net>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Kernel Testers List <kernel-testers@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...e.de>,
Jose Marino <braket@...mail.com>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: Help needed, Re: [Bug #14334] pcmcia suspend regression from
2.6.31.1 to 2.6.31.2 - Dell Inspiron 600m
Hey,
On Sun, Nov 01, 2009 at 09:36:10AM +0100, Rafael J. Wysocki wrote:
> Commit 0c570cdeb8fdfcb354a3e9cd81bfc6a09c19de0c
> (PM / yenta: Fix cardbus suspend/resume regression) caused resume to
> fail on systems with two CardBus bridges. While the exact nature
> of the failure is not known at the moment, it can be worked around by
> splitting the yenta resume into an early part, executed during the
> early phase of resume, that will only resume the socket and power it
> up if there was a card in it during suspend, and a late part,
> executed during "regular" resume, that will carry out all of the
> remaining yenta resume operations.
>
> Fixes http://bugzilla.kernel.org/show_bug.cgi?id=14334, which is a
> listed regression from 2.6.31.
The only issue I see is that we now return 0 unconditionally on the resume
callbacks. Otherwise, it's
Acked-by: Dominik Brodowski <linux@...inikbrodowski.net>
> Index: linux-2.6/drivers/pcmcia/yenta_socket.c
> ===================================================================
> --- linux-2.6.orig/drivers/pcmcia/yenta_socket.c
> +++ linux-2.6/drivers/pcmcia/yenta_socket.c
> @@ -1275,16 +1275,26 @@ static int yenta_dev_resume_noirq(struct
> if (socket->type && socket->type->restore_state)
> socket->type->restore_state(socket);
>
> - return pcmcia_socket_dev_resume(dev);
> + pcmcia_socket_dev_early_resume(dev);
> + return 0;
> +}
> +
> +static int yenta_dev_resume(struct device *dev)
> +{
> + pcmcia_socket_dev_late_resume(dev);
> + return 0;
> }
>
> static struct dev_pm_ops yenta_pm_ops = {
> .suspend_noirq = yenta_dev_suspend_noirq,
> .resume_noirq = yenta_dev_resume_noirq,
> + .resume = yenta_dev_resume,
> .freeze_noirq = yenta_dev_suspend_noirq,
> .thaw_noirq = yenta_dev_resume_noirq,
> + .thaw = yenta_dev_resume,
> .poweroff_noirq = yenta_dev_suspend_noirq,
> .restore_noirq = yenta_dev_resume_noirq,
> + .restore = yenta_dev_resume,
> };
>
> #define YENTA_PM_OPS (¥ta_pm_ops)
> Index: linux-2.6/drivers/pcmcia/cs.c
> ===================================================================
> --- linux-2.6.orig/drivers/pcmcia/cs.c
> +++ linux-2.6/drivers/pcmcia/cs.c
> @@ -98,10 +98,13 @@ EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
> * These functions check for the appropriate struct pcmcia_soket arrays,
> * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
> */
> +static int socket_early_resume(struct pcmcia_socket *skt);
> +static int socket_late_resume(struct pcmcia_socket *skt);
> static int socket_resume(struct pcmcia_socket *skt);
> static int socket_suspend(struct pcmcia_socket *skt);
>
> -int pcmcia_socket_dev_suspend(struct device *dev)
> +static void pcmcia_socket_dev_run(struct device *dev,
> + int (*cb)(struct pcmcia_socket *))
> {
> struct pcmcia_socket *socket;
>
> @@ -110,29 +113,34 @@ int pcmcia_socket_dev_suspend(struct dev
> if (socket->dev.parent != dev)
> continue;
> mutex_lock(&socket->skt_mutex);
> - socket_suspend(socket);
> + cb(socket);
> mutex_unlock(&socket->skt_mutex);
> }
> up_read(&pcmcia_socket_list_rwsem);
> +}
>
> +int pcmcia_socket_dev_suspend(struct device *dev)
> +{
> + pcmcia_socket_dev_run(dev, socket_suspend);
> return 0;
> }
> EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
>
> -int pcmcia_socket_dev_resume(struct device *dev)
> +void pcmcia_socket_dev_early_resume(struct device *dev)
> {
> - struct pcmcia_socket *socket;
> + pcmcia_socket_dev_run(dev, socket_early_resume);
> +}
> +EXPORT_SYMBOL(pcmcia_socket_dev_early_resume);
>
> - down_read(&pcmcia_socket_list_rwsem);
> - list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
> - if (socket->dev.parent != dev)
> - continue;
> - mutex_lock(&socket->skt_mutex);
> - socket_resume(socket);
> - mutex_unlock(&socket->skt_mutex);
> - }
> - up_read(&pcmcia_socket_list_rwsem);
> +void pcmcia_socket_dev_late_resume(struct device *dev)
> +{
> + pcmcia_socket_dev_run(dev, socket_late_resume);
> +}
> +EXPORT_SYMBOL(pcmcia_socket_dev_late_resume);
>
> +int pcmcia_socket_dev_resume(struct device *dev)
> +{
> + pcmcia_socket_dev_run(dev, socket_resume);
> return 0;
> }
> EXPORT_SYMBOL(pcmcia_socket_dev_resume);
> @@ -546,29 +554,34 @@ static int socket_suspend(struct pcmcia_
> return 0;
> }
>
> -/*
> - * Resume a socket. If a card is present, verify its CIS against
> - * our cached copy. If they are different, the card has been
> - * replaced, and we need to tell the drivers.
> - */
> -static int socket_resume(struct pcmcia_socket *skt)
> +static void socket_start_resume(struct pcmcia_socket *skt)
> {
> - int ret;
> -
> - if (!(skt->state & SOCKET_SUSPEND))
> - return -EBUSY;
> -
> skt->socket = dead_socket;
> skt->ops->init(skt);
> skt->ops->set_socket(skt, &skt->socket);
> + if (skt->state & SOCKET_PRESENT)
> + skt->resume_status = socket_setup(skt, resume_delay);
> +}
> +
> +static int socket_early_resume(struct pcmcia_socket *skt)
> +{
> + if (skt->state & SOCKET_SUSPEND)
> + socket_start_resume(skt);
> +
> + return 0;
> +}
> +
> +static int socket_late_resume(struct pcmcia_socket *skt)
> +{
> + if (!(skt->state & SOCKET_SUSPEND))
> + return 0;
>
> if (!(skt->state & SOCKET_PRESENT)) {
> skt->state &= ~SOCKET_SUSPEND;
> return socket_insert(skt);
> }
>
> - ret = socket_setup(skt, resume_delay);
> - if (ret == 0) {
> + if (skt->resume_status == 0) {
> /*
> * FIXME: need a better check here for cardbus cards.
> */
> @@ -596,6 +609,20 @@ static int socket_resume(struct pcmcia_s
> return 0;
> }
>
> +/*
> + * Resume a socket. If a card is present, verify its CIS against
> + * our cached copy. If they are different, the card has been
> + * replaced, and we need to tell the drivers.
> + */
> +static int socket_resume(struct pcmcia_socket *skt)
> +{
> + if (!(skt->state & SOCKET_SUSPEND))
> + return -EBUSY;
> +
> + socket_start_resume(skt);
> + return socket_late_resume(skt);
> +}
> +
> static void socket_remove(struct pcmcia_socket *skt)
> {
> dev_printk(KERN_NOTICE, &skt->dev,
> Index: linux-2.6/include/pcmcia/ss.h
> ===================================================================
> --- linux-2.6.orig/include/pcmcia/ss.h
> +++ linux-2.6/include/pcmcia/ss.h
> @@ -262,6 +262,8 @@ struct pcmcia_socket {
> struct device dev;
> /* data internal to the socket driver */
> void *driver_data;
> + /* status of the card during resume from a system sleep state */
> + int resume_status;
> };
>
>
> @@ -280,6 +282,8 @@ extern struct pccard_resource_ops pccard
>
> /* socket drivers are expected to use these callbacks in their .drv struct */
> extern int pcmcia_socket_dev_suspend(struct device *dev);
> +extern void pcmcia_socket_dev_early_resume(struct device *dev);
> +extern void pcmcia_socket_dev_late_resume(struct device *dev);
> extern int pcmcia_socket_dev_resume(struct device *dev);
>
> /* socket drivers use this callback in their IRQ handler */
--
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