This is needed because the lock needs to be extended to protect the
mapping info access, which is used to construct a scatter-gather list,
and in the process, we might sleep.
Signed-off-by: Felipe Contreras <felipe.contreras@xxxxxxxxx>
---
.../staging/tidspbridge/include/dspbridge/drv.h | 2 +-
drivers/staging/tidspbridge/rmgr/drv_interface.c | 2 +-
drivers/staging/tidspbridge/rmgr/proc.c | 12 ++++++------
3 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/staging/tidspbridge/include/dspbridge/drv.h b/drivers/staging/tidspbridge/include/dspbridge/drv.h
index c1f363e..217c918 100644
--- a/drivers/staging/tidspbridge/include/dspbridge/drv.h
+++ b/drivers/staging/tidspbridge/include/dspbridge/drv.h
@@ -163,7 +163,7 @@ struct process_context {
/* DMM mapped memory resources */
struct list_head dmm_map_list;
- spinlock_t dmm_map_lock;
+ struct semaphore dmm_map_sema;
/* DMM reserved memory resources */
struct list_head dmm_rsv_list;
diff --git a/drivers/staging/tidspbridge/rmgr/drv_interface.c b/drivers/staging/tidspbridge/rmgr/drv_interface.c
index 324fcdf..82c25c6 100644
--- a/drivers/staging/tidspbridge/rmgr/drv_interface.c
+++ b/drivers/staging/tidspbridge/rmgr/drv_interface.c
@@ -507,7 +507,7 @@ static int bridge_open(struct inode *ip, struct file *filp)
pr_ctxt = kzalloc(sizeof(struct process_context), GFP_KERNEL);
if (pr_ctxt) {
pr_ctxt->res_state = PROC_RES_ALLOCATED;
- spin_lock_init(&pr_ctxt->dmm_map_lock);
+ sema_init(&pr_ctxt->dmm_map_sema, 1);
INIT_LIST_HEAD(&pr_ctxt->dmm_map_list);
spin_lock_init(&pr_ctxt->dmm_rsv_lock);
INIT_LIST_HEAD(&pr_ctxt->dmm_rsv_list);
diff --git a/drivers/staging/tidspbridge/rmgr/proc.c b/drivers/staging/tidspbridge/rmgr/proc.c
index b47d7aa..77ab5f5 100644
--- a/drivers/staging/tidspbridge/rmgr/proc.c
+++ b/drivers/staging/tidspbridge/rmgr/proc.c
@@ -144,9 +144,9 @@ static struct dmm_map_object *add_mapping_info(struct process_context *pr_ctxt,
map_obj->size = size;
map_obj->num_usr_pgs = num_usr_pgs;
- spin_lock(&pr_ctxt->dmm_map_lock);
+ down(&pr_ctxt->dmm_map_sema);
list_add(&map_obj->link, &pr_ctxt->dmm_map_list);
- spin_unlock(&pr_ctxt->dmm_map_lock);
+ up(&pr_ctxt->dmm_map_sema);
return map_obj;
}
@@ -170,7 +170,7 @@ static void remove_mapping_information(struct process_context *pr_ctxt,
pr_debug("%s: looking for virt 0x%x size 0x%x\n", __func__,
dsp_addr, size);
- spin_lock(&pr_ctxt->dmm_map_lock);
+ down(&pr_ctxt->dmm_map_sema);
list_for_each_entry(map_obj, &pr_ctxt->dmm_map_list, link) {
pr_debug("%s: candidate: mpu_addr 0x%x virt 0x%x size 0x%x\n",
__func__,
@@ -191,7 +191,7 @@ static void remove_mapping_information(struct process_context *pr_ctxt,
pr_err("%s: failed to find given map info\n", __func__);
out:
- spin_unlock(&pr_ctxt->dmm_map_lock);
+ up(&pr_ctxt->dmm_map_sema);
}
static int match_containing_map_obj(struct dmm_map_object *map_obj,
@@ -211,7 +211,7 @@ static struct dmm_map_object *find_containing_mapping(
pr_debug("%s: looking for mpu_addr 0x%x size 0x%x\n", __func__,
mpu_addr, size);
- spin_lock(&pr_ctxt->dmm_map_lock);
+ down(&pr_ctxt->dmm_map_sema);
list_for_each_entry(map_obj, &pr_ctxt->dmm_map_list, link) {
pr_debug("%s: candidate: mpu_addr 0x%x virt 0x%x size 0x%x\n",
__func__,
@@ -228,7 +228,7 @@ static struct dmm_map_object *find_containing_mapping(
map_obj = NULL;
out:
- spin_unlock(&pr_ctxt->dmm_map_lock);
+ up(&pr_ctxt->dmm_map_sema);
return map_obj;
}
--
1.7.3.3
--
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