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a="76867904" X-IronPort-AV: E=Sophos;i="6.23,113,1770624000"; d="scan'208";a="76867904" X-CSE-ConnectionGUID: qEAhxsBsS+6scMEUggt5/w== X-CSE-MsgGUID: goaiGQl4RKqtFPSb8iBh+A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,113,1770624000"; d="scan'208";a="215611441" From: Vivek Kasireddy To: qemu-devel@nongnu.org Cc: Vivek Kasireddy , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Akihiko Odaki , Dmitry Osipenko , Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH v11 04/10] virtio-gpu-dmabuf: Remove rcu_read_lock/unlock from virtio_gpu_create_udmabuf() Date: Tue, 10 Mar 2026 19:50:46 -0700 Message-ID: <20260311025340.1335673-5-vivek.kasireddy@intel.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260311025340.1335673-1-vivek.kasireddy@intel.com> References: <20260311025340.1335673-1-vivek.kasireddy@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.198.163.13; envelope-from=vivek.kasireddy@intel.com; helo=mgamail.intel.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.819, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.903, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1773197862445158500 There is no need to wrap the call to qemu_ram_block_from_host() with rcu_read_lock/unlock as we already hold a reference to the memory region that owns the ram block. Note that, the reference was obtained via dma_memory_map() while creating the mapping. Cc: Marc-Andr=C3=A9 Lureau Cc: Alex Benn=C3=A9e Cc: Akihiko Odaki Cc: Dmitry Osipenko Cc: Alex Williamson Cc: C=C3=A9dric Le Goater Reviewed-by: Akihiko Odaki Signed-off-by: Vivek Kasireddy --- hw/display/virtio-gpu-dmabuf.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/hw/display/virtio-gpu-dmabuf.c b/hw/display/virtio-gpu-dmabuf.c index c34d4c85bc..0782bcf3a1 100644 --- a/hw/display/virtio-gpu-dmabuf.c +++ b/hw/display/virtio-gpu-dmabuf.c @@ -43,10 +43,7 @@ static void virtio_gpu_create_udmabuf(struct virtio_gpu_= simple_resource *res) sizeof(struct udmabuf_create_item) * res->iov_cnt); =20 for (i =3D 0; i < res->iov_cnt; i++) { - rcu_read_lock(); rb =3D qemu_ram_block_from_host(res->iov[i].iov_base, false, &offs= et); - rcu_read_unlock(); - if (!rb || rb->fd < 0) { g_free(list); return; --=20 2.53.0