diff options
author | Dominik Brodowski <linux@dominikbrodowski.net> | 2010-01-12 20:42:51 (GMT) |
---|---|---|
committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2010-02-17 16:48:13 (GMT) |
commit | 6b8e087b86c59c3941e125738d30cf38014089e0 (patch) | |
tree | 08f77e50e5237e3bbe5e4c8f114fddc09f242628 /drivers/pcmcia/pcmcia_resource.c | |
parent | c6958fdb041db6ed77f24e871dd4af5f059d1a2b (diff) | |
download | linux-fsl-qoriq-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/pcmcia_resource.c')
-rw-r--r-- | drivers/pcmcia/pcmcia_resource.c | 20 |
1 files changed, 15 insertions, 5 deletions
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; |