[PATCH 40/49] pcmcia: delay re-scanning and re-querying of PCMCIA bus
Dominik Brodowski
linux at dominikbrodowski.net
Sat Feb 27 05:42:35 EST 2010
After a CIS update -- or the finalization of the resource database --,
proceed with the re-scanning or re-querying of PCMCIA cards only in
a separate thread to avoid deadlocks.
Tested-by: Wolfram Sang <w.sang at pengutronix.de>
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
---
drivers/pcmcia/cistpl.c | 10 +-----
drivers/pcmcia/cs.c | 8 ++++-
drivers/pcmcia/cs_internal.h | 3 +-
drivers/pcmcia/ds.c | 80 ++++++++++++++++++++++++----------------
drivers/pcmcia/socket_sysfs.c | 11 +-----
5 files changed, 59 insertions(+), 53 deletions(-)
diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 14de287..17a5da3 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -1670,15 +1670,7 @@ static ssize_t pccard_store_cis(struct kobject *kobj,
if (error)
return -EIO;
- mutex_lock(&s->skt_mutex);
- if ((s->callback) && (s->state & SOCKET_PRESENT) &&
- !(s->state & SOCKET_CARDBUS)) {
- if (try_module_get(s->callback->owner)) {
- s->callback->requery(s, 1);
- module_put(s->callback->owner);
- }
- }
- mutex_unlock(&s->skt_mutex);
+ pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
return count;
}
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index 823ecda..d529e02 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -728,6 +728,11 @@ static int pccardd(void *__skt)
if (!ret)
socket_suspend(skt);
}
+ if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
+ !(skt->state & SOCKET_CARDBUS)) {
+ if (!ret && skt->callback)
+ skt->callback->requery(skt);
+ }
}
mutex_unlock(&skt->skt_mutex);
@@ -783,7 +788,8 @@ EXPORT_SYMBOL(pcmcia_parse_events);
* userspace-issued insert, eject, suspend and resume commands must be
* handled by pccardd to avoid any sysfs-related deadlocks. Valid events
* are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
- * PCMCIA_UEVENT_RESUME (for resume) and PCMCIA_UEVENT_SUSPEND (for suspend).
+ * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
+ * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
*/
void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
{
diff --git a/drivers/pcmcia/cs_internal.h b/drivers/pcmcia/cs_internal.h
index 127c97a..f95864c 100644
--- a/drivers/pcmcia/cs_internal.h
+++ b/drivers/pcmcia/cs_internal.h
@@ -110,7 +110,7 @@ struct pcmcia_callback{
struct module *owner;
int (*event) (struct pcmcia_socket *s,
event_t event, int priority);
- void (*requery) (struct pcmcia_socket *s, int new_cis);
+ void (*requery) (struct pcmcia_socket *s);
int (*validate) (struct pcmcia_socket *s, unsigned int *i);
int (*suspend) (struct pcmcia_socket *s);
int (*resume) (struct pcmcia_socket *s);
@@ -129,6 +129,7 @@ void pcmcia_parse_uevents(struct pcmcia_socket *socket, unsigned int events);
#define PCMCIA_UEVENT_INSERT 0x0002
#define PCMCIA_UEVENT_SUSPEND 0x0004
#define PCMCIA_UEVENT_RESUME 0x0008
+#define PCMCIA_UEVENT_REQUERY 0x0010
struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt);
void pcmcia_put_socket(struct pcmcia_socket *skt);
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 76a2163..5400e20 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -432,16 +432,20 @@ static int pcmcia_device_query(struct pcmcia_device *p_dev)
if (!pccard_read_tuple(p_dev->socket, BIND_FN_ALL,
CISTPL_MANFID, &manf_id)) {
+ mutex_lock(&p_dev->socket->ops_mutex);
p_dev->manf_id = manf_id.manf;
p_dev->card_id = manf_id.card;
p_dev->has_manf_id = 1;
p_dev->has_card_id = 1;
+ mutex_unlock(&p_dev->socket->ops_mutex);
}
if (!pccard_read_tuple(p_dev->socket, p_dev->func,
CISTPL_FUNCID, &func_id)) {
+ mutex_lock(&p_dev->socket->ops_mutex);
p_dev->func_id = func_id.func;
p_dev->has_func_id = 1;
+ mutex_unlock(&p_dev->socket->ops_mutex);
} else {
/* rule of thumb: cards with no FUNCID, but with
* common memory device geometry information, are
@@ -458,14 +462,17 @@ static int pcmcia_device_query(struct pcmcia_device *p_dev)
dev_dbg(&p_dev->dev,
"mem device geometry probably means "
"FUNCID_MEMORY\n");
+ mutex_lock(&p_dev->socket->ops_mutex);
p_dev->func_id = CISTPL_FUNCID_MEMORY;
p_dev->has_func_id = 1;
+ mutex_unlock(&p_dev->socket->ops_mutex);
}
kfree(devgeo);
}
if (!pccard_read_tuple(p_dev->socket, BIND_FN_ALL, CISTPL_VERS_1,
vers1)) {
+ mutex_lock(&p_dev->socket->ops_mutex);
for (i = 0; i < min_t(unsigned int, 4, vers1->ns); i++) {
char *tmp;
unsigned int length;
@@ -484,6 +491,7 @@ static int pcmcia_device_query(struct pcmcia_device *p_dev)
p_dev->prod_id[i] = strncpy(p_dev->prod_id[i],
tmp, length);
}
+ mutex_unlock(&p_dev->socket->ops_mutex);
}
kfree(vers1);
@@ -660,7 +668,7 @@ static void pcmcia_delayed_add_device(struct work_struct *work)
pcmcia_device_add(s, mfc_pfc);
}
-static int pcmcia_requery(struct device *dev, void * _data)
+static int pcmcia_requery_callback(struct device *dev, void * _data)
{
struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
if (!p_dev->dev.driver) {
@@ -671,44 +679,57 @@ static int pcmcia_requery(struct device *dev, void * _data)
return 0;
}
-static void pcmcia_bus_rescan(struct pcmcia_socket *skt, int new_cis)
+static void pcmcia_requery(struct pcmcia_socket *s)
{
- int no_devices = 0;
- int ret = 0;
-
- /* must be called with skt_mutex held */
- dev_dbg(&skt->dev, "re-scanning socket %d\n", skt->sock);
+ int present;
- mutex_lock(&skt->ops_mutex);
- if (list_empty(&skt->devices_list))
- no_devices = 1;
- mutex_unlock(&skt->ops_mutex);
+ mutex_lock(&s->ops_mutex);
+ present = s->pcmcia_state.present;
+ mutex_unlock(&s->ops_mutex);
- /* If this is because of a CIS override, start over */
- if (new_cis && !no_devices)
- pcmcia_card_remove(skt, NULL);
+ if (!present)
+ return;
- /* if no devices were added for this socket yet because of
- * missing resource information or other trouble, we need to
- * do this now. */
- if (no_devices || new_cis) {
- ret = pcmcia_card_add(skt);
- if (ret)
- return;
+ if (s->functions == 0) {
+ pcmcia_card_add(s);
+ return;
}
/* some device information might have changed because of a CIS
* update or because we can finally read it correctly... so
* determine it again, overwriting old values if necessary. */
- bus_for_each_dev(&pcmcia_bus_type, NULL, NULL, pcmcia_requery);
+ bus_for_each_dev(&pcmcia_bus_type, NULL, NULL, pcmcia_requery_callback);
+
+ /* if the CIS changed, we need to check whether the number of
+ * functions changed. */
+ if (s->fake_cis) {
+ int old_funcs, new_funcs;
+ cistpl_longlink_mfc_t mfc;
+
+ /* does this cis override add or remove functions? */
+ old_funcs = s->functions;
+
+ if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC,
+ &mfc))
+ new_funcs = mfc.nfn;
+ else
+ new_funcs = 1;
+ if (old_funcs > new_funcs) {
+ pcmcia_card_remove(s, NULL);
+ pcmcia_card_add(s);
+ } else if (new_funcs > old_funcs) {
+ s->functions = new_funcs;
+ pcmcia_device_add(s, 1);
+ }
+ }
/* we re-scan all devices, not just the ones connected to this
* socket. This does not matter, though. */
- ret = bus_rescan_devices(&pcmcia_bus_type);
- if (ret)
- printk(KERN_INFO "pcmcia: bus_rescan_devices failed\n");
+ if (bus_rescan_devices(&pcmcia_bus_type))
+ dev_warn(&s->dev, "rescanning the bus failed\n");
}
+
#ifdef CONFIG_PCMCIA_LOAD_CIS
/**
@@ -1085,7 +1106,6 @@ static ssize_t pcmcia_store_allow_func_id_match(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
- int ret;
if (!count)
return -EINVAL;
@@ -1093,11 +1113,7 @@ static ssize_t pcmcia_store_allow_func_id_match(struct device *dev,
mutex_lock(&p_dev->socket->ops_mutex);
p_dev->allow_func_id_match = 1;
mutex_unlock(&p_dev->socket->ops_mutex);
-
- ret = bus_rescan_devices(&pcmcia_bus_type);
- if (ret)
- printk(KERN_INFO "pcmcia: bus_rescan_devices failed after "
- "allowing func_id matches\n");
+ pcmcia_parse_uevents(p_dev->socket, PCMCIA_UEVENT_REQUERY);
return count;
}
@@ -1359,7 +1375,7 @@ EXPORT_SYMBOL(pcmcia_dev_present);
static struct pcmcia_callback pcmcia_bus_callback = {
.owner = THIS_MODULE,
.event = ds_event,
- .requery = pcmcia_bus_rescan,
+ .requery = pcmcia_requery,
.validate = pccard_validate_cis,
.suspend = pcmcia_bus_suspend,
.resume = pcmcia_bus_resume,
diff --git a/drivers/pcmcia/socket_sysfs.c b/drivers/pcmcia/socket_sysfs.c
index fba0e30..0827801 100644
--- a/drivers/pcmcia/socket_sysfs.c
+++ b/drivers/pcmcia/socket_sysfs.c
@@ -201,16 +201,7 @@ static ssize_t pccard_store_resource(struct device *dev,
s->resource_setup_done = 1;
mutex_unlock(&s->ops_mutex);
- mutex_lock(&s->skt_mutex);
- if ((s->callback) &&
- (s->state & SOCKET_PRESENT) &&
- !(s->state & SOCKET_CARDBUS)) {
- if (try_module_get(s->callback->owner)) {
- s->callback->requery(s, 0);
- module_put(s->callback->owner);
- }
- }
- mutex_unlock(&s->skt_mutex);
+ pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
return count;
}
--
1.6.3.3
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