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a53e356df5
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: 835764ddd9 ("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>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250822100043.2604794-2-srinivas.kandagatla@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.