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Date: Mon, 20 Dec 2010 16:25:33 +0200 From: Felipe Contreras <felipe.contreras@...ia.com> To: linux-main <linux-kernel@...r.kernel.org>, linux-omap <linux-omap@...r.kernel.org>, Greg KH <greg@...ah.com>, Omar Ramirez Luna <omar.ramirez@...com> Cc: Ohad Ben-Cohen <ohad@...ery.com>, Fernando Guzman Lugo <fernando.lugo@...com>, Nishanth Menon <nm@...com>, Ameya Palande <ameya.palande@...ia.com>, Felipe Contreras <felipe.contreras@...ia.com> Subject: [PATCH 1/2] staging: tidspbridge: convert dmm_map_lock to sema 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@...ia.com> --- .../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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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