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pcmcia: add locking to set_mem_map()

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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@pengutronix.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski 2010-01-12 21:42:51 +01:00
parent c6958fdb04
commit 6b8e087b86
5 changed files with 32 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/pcmcia/cistpl.c
View file

@ -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;
}

1
drivers/pcmcia/cs.c
View file

@ -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) {

20
drivers/pcmcia/pcmcia_resource.c
View file

@ -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;

8
drivers/pcmcia/rsrc_nonstatic.c
View file

@ -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;

2
include/pcmcia/ss.h
View file

@ -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;