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authorDominik Brodowski <linux@dominikbrodowski.net>2010-01-12 23:42:51 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2010-02-17 19:48:13 +0300
commit6b8e087b86c59c3941e125738d30cf38014089e0 (patch)
tree08f77e50e5237e3bbe5e4c8f114fddc09f242628 /drivers/pcmcia/rsrc_nonstatic.c
parentc6958fdb041db6ed77f24e871dd4af5f059d1a2b (diff)
downloadlinux-6b8e087b86c59c3941e125738d30cf38014089e0.tar.xz
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/rsrc_nonstatic.c')
-rw-r--r--drivers/pcmcia/rsrc_nonstatic.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 91626c17f97b..1de46cf2772f 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;