From: Srinivas Kandagatla srinivas.kandagatla@oss.qualcomm.com

While testing rpmsg-char interface it was noticed that duplicate sysfs entries are getting created and below warning is noticed.

Reason for this is that we are leaking rpmsg device pointer, setting it null without actually unregistering device. Any further attempts to unregister fail because rpdev is NULL, resulting in a leak.

Fix this by unregistering rpmsg device before removing its reference from rpmsg channel.

sysfs: cannot create duplicate filename '/devices/platform/soc@0/3700000.remot eproc/remoteproc/remoteproc1/3700000.remoteproc:glink-edge/3700000.remoteproc: glink-edge.adsp_apps.-1.-1' [ 114.115347] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.16.0-rc4 #7 PREEMPT [ 114.115355] Hardware name: Qualcomm Technologies, Inc. Robotics RB3gen2 (DT) [ 114.115358] Workqueue: events qcom_glink_work [ 114.115371] Call trace:8 [ 114.115374] show_stack+0x18/0x24 (C) [ 114.115382] dump_stack_lvl+0x60/0x80 [ 114.115388] dump_stack+0x18/0x24 [ 114.115393] sysfs_warn_dup+0x64/0x80 [ 114.115402] sysfs_create_dir_ns+0xf4/0x120 [ 114.115409] kobject_add_internal+0x98/0x260 [ 114.115416] kobject_add+0x9c/0x108 [ 114.115421] device_add+0xc4/0x7a0 [ 114.115429] rpmsg_register_device+0x5c/0xb0 [ 114.115434] qcom_glink_work+0x4bc/0x820 [ 114.115438] process_one_work+0x148/0x284 [ 114.115446] worker_thread+0x2c4/0x3e0 [ 114.115452] kthread+0x12c/0x204 [ 114.115457] ret_from_fork+0x10/0x20 [ 114.115464] kobject: kobject_add_internal failed for 3700000.remoteproc: glink-edge.adsp_apps.-1.-1 with -EEXIST, don't try to register things with the same name in the same directory. [ 114.250045] rpmsg 3700000.remoteproc:glink-edge.adsp_apps.-1.-1: device_add failed: -17

Fixes: 835764ddd9af ("rpmsg: glink: Move the common glink protocol implementation to glink_native.c") Cc: Stable@vger.kernel.org Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@oss.qualcomm.com --- drivers/rpmsg/qcom_glink_native.c | 8 ++++++++ 1 file changed, 8 insertions(+)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 820a6ca5b1d7..3a15d9d10808 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -1399,6 +1399,7 @@ static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) { struct glink_channel *channel = to_glink_channel(ept); struct qcom_glink *glink = channel->glink; + struct rpmsg_channel_info chinfo; unsigned long flags;

spin_lock_irqsave(&channel->recv_lock, flags); @@ -1406,6 +1407,13 @@ static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept) spin_unlock_irqrestore(&channel->recv_lock, flags);

/* Decouple the potential rpdev from the channel */ + if (channel->rpdev) { + strscpy_pad(chinfo.name, channel->name, sizeof(chinfo.name)); + chinfo.src = RPMSG_ADDR_ANY; + chinfo.dst = RPMSG_ADDR_ANY; + + rpmsg_unregister_device(glink->dev, &chinfo); + } channel->rpdev = NULL;

qcom_glink_send_close_req(glink, channel);