Re: Help needed, Re: [Bug #14334] pcmcia suspend regression from 2.6.31.1 to 2.6.31.2 - Dell Inspiron 600m

From: Rafael J. Wysocki
Date: Sat Oct 31 2009 - 19:22:28 EST

On Sunday 01 November 2009, Rafael J. Wysocki wrote:
> On Saturday 31 October 2009, Benjamin Herrenschmidt wrote:
> > On Sat, 2009-10-31 at 22:27 +0100, Rafael J. Wysocki wrote:
> >
> > > In the meantime I invented a patch that works, ie. apparently fixes the problem
> > > and if there was a card in the socket during the suspend, it's standard config
> > > space is restored correctly. I tested it on one of my boxes with two different
> > > CardBus adapters and Jose says it fixes the problem for him.
> > >
> > > The patch is appended, please have a look.
> >
> > Base idea of the patch sounds good, quick browse through looks good too,
> >
> > I'll try to band on it with various PCMCIA & CB gear tomorrow.
>
> Wait, I made a mistake when testing it, didn't notice that my distro ejected
> PCMCIA cards automatically before suspend (sigh).
>
> Working on a better patch right now, will hopefully post it in a while.

Here you go.

Waiting for feedback from the reporters of BKO #14334, so there's no sign-off
for now.

---
drivers/pcmcia/cs.c | 79 ++++++++++++++++++++++++++++--------------
drivers/pcmcia/yenta_socket.c | 12 +++++-
include/pcmcia/ss.h | 4 ++
3 files changed, 68 insertions(+), 27 deletions(-)

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 (&yenta_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 */
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/