[PATCH v3 22/25] io_uring/rsrc: Allow buffer release callback to be optional

[Joanne Koong <joannelkoong@gmail.com>]

This is a preparatory patch for supporting kernel-populated buffers in
fuse io-uring, which does not need a release callback.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Caleb Sander Mateos <csander@purestorage.com>
---
 io_uring/rsrc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 5fe2695dafb6..5a708cecba4a 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -148,7 +148,8 @@ static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf *imu)
 
 	if (imu->acct_pages)
 		io_unaccount_mem(ctx->user, ctx->mm_account, imu->acct_pages);
-	imu->release(imu->priv);
+	if (imu->release)
+		imu->release(imu->priv);
 	io_free_imu(ctx, imu);
 }
 
-- 
2.47.3