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authorDominik Brodowski <linux@dominikbrodowski.net>2010-01-12 21:42:51 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2010-02-17 17:48:13 +0100
commit6b8e087b86c59c3941e125738d30cf38014089e0 (patch)
tree08f77e50e5237e3bbe5e4c8f114fddc09f242628 /drivers/pcmcia/cistpl.c
parentc6958fdb041db6ed77f24e871dd4af5f059d1a2b (diff)
pcmcia: add locking to set_mem_map()
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>
Diffstat (limited to 'drivers/pcmcia/cistpl.c')
-rw-r--r--drivers/pcmcia/cistpl.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 936417c3e79e..9ad66c9848e3 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;
}