diff mbox series

[v4,03/10] DMA reservations: use the new mmap locking API

Message ID 20200415004353.130248-4-walken@google.com (mailing list archive)
State New, archived
Headers show
Series Add a new mmap locking API wrapping mmap_sem calls | expand

Commit Message

Michel Lespinasse April 15, 2020, 12:43 a.m. UTC 
This use is converted manually ahead of the next patch in the series,
as it requires including a new header which the automated conversion
would miss.

Signed-off-by: Michel Lespinasse <walken@google.com>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
---
 drivers/dma-buf/dma-resv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 4264e64788c4..b45f8514dc82 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -34,6 +34,7 @@ 
 
 #include <linux/dma-resv.h>
 #include <linux/export.h>
+#include <linux/mm.h>
 #include <linux/sched/mm.h>
 
 /**
@@ -109,7 +110,7 @@  static int __init dma_resv_lockdep(void)
 
 	dma_resv_init(&obj);
 
-	down_read(&mm->mmap_sem);
+	mmap_read_lock(mm);
 	ww_acquire_init(&ctx, &reservation_ww_class);
 	ret = dma_resv_lock(&obj, &ctx);
 	if (ret == -EDEADLK)
@@ -118,7 +119,7 @@  static int __init dma_resv_lockdep(void)
 	fs_reclaim_release(GFP_KERNEL);
 	ww_mutex_unlock(&obj.lock);
 	ww_acquire_fini(&ctx);
-	up_read(&mm->mmap_sem);
+	mmap_read_unlock(mm);
 	
 	mmput(mm);