From: Loic Pallardy <loic.pallardy@st.com> To: bjorn.andersson@linaro.org, ohad@wizery.com Cc: lee.jones@linaro.org, loic.pallardy@st.com, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@stlinux.com Subject: [PATCH 1/1] remoteproc: fix vdev reference management Date: Wed, 14 Dec 2016 16:11:00 +0100 [thread overview] Message-ID: <1481728260-21771-1-git-send-email-loic.pallardy@st.com> (raw) Commit 2b45cef5868a ("remoteproc: Further extend the vdev life cycle") extends kref support for vdev management. It introduces a regression when following sequence is executed: rproc_boot --> rproc_shutdown --> rproc_boot Second rproc_boot call crashes on register_virtio_device as device is already existing. Issue is previous vdev is never released when rproc is stop because associated refcount is too high. kref_get introduces is not needed as kref_init already initializes krefcount to 1 because it considers associated variable as used. This introduces a misalignment between kref_get and kref_put calls. Signed-off-by: Loic Pallardy <loic.pallardy@st.com> --- drivers/remoteproc/remoteproc_core.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 9a507e7..feb24c4 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -396,9 +396,6 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, goto unwind_vring_allocations; } - /* track the rvdevs list reference */ - kref_get(&rvdev->refcount); - list_add_tail(&rvdev->node, &rproc->rvdevs); rproc_add_subdev(rproc, &rvdev->subdev, -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Loic Pallardy <loic.pallardy@st.com> To: <bjorn.andersson@linaro.org>, <ohad@wizery.com> Cc: <lee.jones@linaro.org>, <loic.pallardy@st.com>, <linux-remoteproc@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <kernel@stlinux.com> Subject: [PATCH 1/1] remoteproc: fix vdev reference management Date: Wed, 14 Dec 2016 16:11:00 +0100 [thread overview] Message-ID: <1481728260-21771-1-git-send-email-loic.pallardy@st.com> (raw) Commit 2b45cef5868a ("remoteproc: Further extend the vdev life cycle") extends kref support for vdev management. It introduces a regression when following sequence is executed: rproc_boot --> rproc_shutdown --> rproc_boot Second rproc_boot call crashes on register_virtio_device as device is already existing. Issue is previous vdev is never released when rproc is stop because associated refcount is too high. kref_get introduces is not needed as kref_init already initializes krefcount to 1 because it considers associated variable as used. This introduces a misalignment between kref_get and kref_put calls. Signed-off-by: Loic Pallardy <loic.pallardy@st.com> --- drivers/remoteproc/remoteproc_core.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 9a507e7..feb24c4 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -396,9 +396,6 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, goto unwind_vring_allocations; } - /* track the rvdevs list reference */ - kref_get(&rvdev->refcount); - list_add_tail(&rvdev->node, &rproc->rvdevs); rproc_add_subdev(rproc, &rvdev->subdev, -- 1.9.1
next reply other threads:[~2016-12-14 15:11 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-12-14 15:11 Loic Pallardy [this message] 2016-12-14 15:11 ` [PATCH 1/1] remoteproc: fix vdev reference management Loic Pallardy 2017-01-04 8:13 ` [STLinux Kernel] " Patrice Chotard 2017-01-04 8:13 ` Patrice Chotard
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