All the managed resources would be freed by the time release function is invoked. Handling such memory in qcom_smd_edge_release() would do bad things.
Found this issue while testing Audio usecase where the dsp is started up and shutdown in a loop.
This patch fixes this issue by using simple kzalloc for allocating channel->name and channel which is then freed in qcom_smd_edge_release().
Without this patch restarting a remoteproc would crash the system. Fixes: 53e2822e56c7 ("rpmsg: Introduce Qualcomm SMD backend") Cc: stable@vger.kernel.org Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org --- drivers/rpmsg/qcom_smd.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c index 5ce9bf7b897d..f63adcd95eb0 100644 --- a/drivers/rpmsg/qcom_smd.c +++ b/drivers/rpmsg/qcom_smd.c @@ -1100,12 +1100,12 @@ static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *ed void *info; int ret;
- channel = devm_kzalloc(&edge->dev, sizeof(*channel), GFP_KERNEL); + channel = kzalloc(sizeof(*channel), GFP_KERNEL); if (!channel) return ERR_PTR(-ENOMEM);
channel->edge = edge; - channel->name = devm_kstrdup(&edge->dev, name, GFP_KERNEL); + channel->name = kstrdup(name, GFP_KERNEL); if (!channel->name) return ERR_PTR(-ENOMEM);
@@ -1156,8 +1156,8 @@ static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *ed return channel;
free_name_and_channel: - devm_kfree(&edge->dev, channel->name); - devm_kfree(&edge->dev, channel); + kfree(channel->name); + kfree(channel);
return ERR_PTR(ret); } @@ -1378,13 +1378,13 @@ static int qcom_smd_parse_edge(struct device *dev, */ static void qcom_smd_edge_release(struct device *dev) { - struct qcom_smd_channel *channel; + struct qcom_smd_channel *channel, *tmp; struct qcom_smd_edge *edge = to_smd_edge(dev);
- list_for_each_entry(channel, &edge->channels, list) { - SET_RX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED); - SET_RX_CHANNEL_INFO(channel, head, 0); - SET_RX_CHANNEL_INFO(channel, tail, 0); + list_for_each_entry_safe(channel, tmp, &edge->channels, list) { + list_del(&channel->list); + kfree(channel->name); + kfree(channel); }
kfree(edge);