[PATCH 27/49] pcmcia: add locking to set_mem_map()
Dominik Brodowski
linux at dominikbrodowski.net
Sat Feb 27 05:42:22 EST 2010
Protect the pccard_operations callback "set_mem_map" by a new
mutex ops_mutex. This mutex also protects the following values
in struct pcmcia_socket:
pccard_mem_map win[]
pccard_mem_map cis_mem
void __iomem *cis_virt
Tested-by: Wolfram Sang <w.sang at pengutronix.de>
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
---
drivers/pcmcia/cistpl.c | 6 ++++++
drivers/pcmcia/cs.c | 1 +
drivers/pcmcia/pcmcia_resource.c | 20 +++++++++++++++-----
drivers/pcmcia/rsrc_nonstatic.c | 8 ++++++++
include/pcmcia/ss.h | 2 ++
5 files changed, 32 insertions(+), 5 deletions(-)
diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 936417c..9ad66c9 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -64,6 +64,7 @@ module_param(cis_width, int, 0444);
void release_cis_mem(struct pcmcia_socket *s)
{
+ mutex_lock(&s->ops_mutex);
if (s->cis_mem.flags & MAP_ACTIVE) {
s->cis_mem.flags &= ~MAP_ACTIVE;
s->ops->set_mem_map(s, &s->cis_mem);
@@ -75,6 +76,7 @@ void release_cis_mem(struct pcmcia_socket *s)
iounmap(s->cis_virt);
s->cis_virt = NULL;
}
+ mutex_unlock(&s->ops_mutex);
}
/*
@@ -88,11 +90,13 @@ set_cis_map(struct pcmcia_socket *s, unsigned int card_offset, unsigned int flag
pccard_mem_map *mem = &s->cis_mem;
int ret;
+ mutex_lock(&s->ops_mutex);
if (!(s->features & SS_CAP_STATIC_MAP) && (mem->res == NULL)) {
mem->res = pcmcia_find_mem_region(0, s->map_size, s->map_size, 0, s);
if (mem->res == NULL) {
dev_printk(KERN_NOTICE, &s->dev,
"cs: unable to map card memory!\n");
+ mutex_unlock(&s->ops_mutex);
return NULL;
}
s->cis_virt = NULL;
@@ -108,6 +112,7 @@ set_cis_map(struct pcmcia_socket *s, unsigned int card_offset, unsigned int flag
if (ret) {
iounmap(s->cis_virt);
s->cis_virt = NULL;
+ mutex_unlock(&s->ops_mutex);
return NULL;
}
@@ -117,6 +122,7 @@ set_cis_map(struct pcmcia_socket *s, unsigned int card_offset, unsigned int flag
s->cis_virt = ioremap(mem->static_start, s->map_size);
}
+ mutex_unlock(&s->ops_mutex);
return s->cis_virt;
}
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index 43c90f6..91aa1f2 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -222,6 +222,7 @@ int pcmcia_register_socket(struct pcmcia_socket *socket)
init_completion(&socket->socket_released);
init_completion(&socket->thread_done);
mutex_init(&socket->skt_mutex);
+ mutex_init(&socket->ops_mutex);
spin_lock_init(&socket->thread_lock);
if (socket->resource_ops->init) {
diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index 8ceb7ab..f31ba89 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -223,6 +223,7 @@ int pcmcia_map_mem_page(struct pcmcia_device *p_dev, window_handle_t wh,
memreq_t *req)
{
struct pcmcia_socket *s = p_dev->socket;
+ int ret;
wh--;
if (wh >= MAX_WIN)
@@ -231,12 +232,13 @@ int pcmcia_map_mem_page(struct pcmcia_device *p_dev, window_handle_t wh,
dev_dbg(&s->dev, "failure: requested page is zero\n");
return -EINVAL;
}
+ mutex_lock(&s->ops_mutex);
s->win[wh].card_start = req->CardOffset;
- if (s->ops->set_mem_map(s, &s->win[wh]) != 0) {
- dev_dbg(&s->dev, "failed to set_mem_map\n");
- return -EIO;
- }
- return 0;
+ ret = s->ops->set_mem_map(s, &s->win[wh]);
+ if (ret)
+ dev_warn(&s->dev, "failed to set_mem_map\n");
+ mutex_unlock(&s->ops_mutex);
+ return ret;
} /* pcmcia_map_mem_page */
EXPORT_SYMBOL(pcmcia_map_mem_page);
@@ -437,10 +439,12 @@ int pcmcia_release_window(struct pcmcia_device *p_dev, window_handle_t wh)
if (wh >= MAX_WIN)
return -EINVAL;
+ mutex_lock(&s->ops_mutex);
win = &s->win[wh];
if (!(p_dev->_win & CLIENT_WIN_REQ(wh))) {
dev_dbg(&s->dev, "not releasing unknown window\n");
+ mutex_unlock(&s->ops_mutex);
return -EINVAL;
}
@@ -456,6 +460,7 @@ int pcmcia_release_window(struct pcmcia_device *p_dev, window_handle_t wh)
win->res = NULL;
}
p_dev->_win &= ~CLIENT_WIN_REQ(wh);
+ mutex_unlock(&s->ops_mutex);
return 0;
} /* pcmcia_release_window */
@@ -829,6 +834,7 @@ int pcmcia_request_window(struct pcmcia_device *p_dev, win_req_t *req, window_ha
return -EINVAL;
}
+ mutex_lock(&s->ops_mutex);
win = &s->win[w];
if (!(s->features & SS_CAP_STATIC_MAP)) {
@@ -836,6 +842,7 @@ int pcmcia_request_window(struct pcmcia_device *p_dev, win_req_t *req, window_ha
(req->Attributes & WIN_MAP_BELOW_1MB), s);
if (!win->res) {
dev_dbg(&s->dev, "allocating mem region failed\n");
+ mutex_unlock(&s->ops_mutex);
return -EINVAL;
}
}
@@ -854,8 +861,10 @@ int pcmcia_request_window(struct pcmcia_device *p_dev, win_req_t *req, window_ha
if (req->Attributes & WIN_USE_WAIT)
win->flags |= MAP_USE_WAIT;
win->card_start = 0;
+
if (s->ops->set_mem_map(s, win) != 0) {
dev_dbg(&s->dev, "failed to set memory mapping\n");
+ mutex_unlock(&s->ops_mutex);
return -EIO;
}
s->state |= SOCKET_WIN_REQ(w);
@@ -866,6 +875,7 @@ int pcmcia_request_window(struct pcmcia_device *p_dev, win_req_t *req, window_ha
else
req->Base = win->res->start;
+ mutex_unlock(&s->ops_mutex);
*wh = w + 1;
return 0;
diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 91626c1..1de46cf 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -274,17 +274,21 @@ static int readable(struct pcmcia_socket *s, struct resource *res,
{
int ret = -EINVAL;
+ mutex_lock(&s->ops_mutex);
s->cis_mem.res = res;
s->cis_virt = ioremap(res->start, s->map_size);
if (s->cis_virt) {
+ mutex_unlock(&s->ops_mutex);
/* as we're only called from pcmcia.c, we're safe */
if (s->callback->validate)
ret = s->callback->validate(s, count);
/* invalidate mapping */
+ mutex_lock(&s->ops_mutex);
iounmap(s->cis_virt);
s->cis_virt = NULL;
}
s->cis_mem.res = NULL;
+ mutex_unlock(&s->ops_mutex);
if ((ret) || (*count == 0))
return -EINVAL;
return 0;
@@ -300,6 +304,8 @@ static int checksum(struct pcmcia_socket *s, struct resource *res,
int i, a = 0, b = -1, d;
void __iomem *virt;
+ mutex_lock(&s->ops_mutex);
+
virt = ioremap(res->start, s->map_size);
if (virt) {
map.map = 0;
@@ -322,6 +328,8 @@ static int checksum(struct pcmcia_socket *s, struct resource *res,
iounmap(virt);
}
+ mutex_unlock(&s->ops_mutex);
+
if (b == -1)
return -EINVAL;
diff --git a/include/pcmcia/ss.h b/include/pcmcia/ss.h
index 9ab53d8..e756069 100644
--- a/include/pcmcia/ss.h
+++ b/include/pcmcia/ss.h
@@ -203,6 +203,8 @@ struct pcmcia_socket {
unsigned int thread_events;
/* protects socket h/w state */
struct mutex skt_mutex;
+ /* protects PCMCIA state */
+ struct mutex ops_mutex;
/* protects thread_events */
spinlock_t thread_lock;
--
1.6.3.3
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