From: Rishabh Bhatnagar <rishabhb@codeaurora.org>
To: sudeep.holla@arm.com, cristian.marussi@arm.com
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, avajid@codeaurora.org,
adharmap@codeaurora.org,
Rishabh Bhatnagar <rishabhb@codeaurora.org>
Subject: [PATCH v3] firmware: arm_scmi: Free mailbox channels if probe fails
Date: Wed, 4 Aug 2021 14:19:59 -0700 [thread overview]
Message-ID: <1628111999-21595-1-git-send-email-rishabhb@codeaurora.org> (raw)
Mailbox channels for the base protocol are setup during probe.
There can be a scenario where probe fails to acquire the base
protocol due to a timeout leading to cleaning up of all device
managed memory including the scmi_mailbox structure setup during
mailbox_chan_setup function.
[ 12.735104]arm-scmi soc:qcom,scmi: timed out in resp(caller: version_get+0x84/0x140)
[ 12.735224]arm-scmi soc:qcom,scmi: unable to communicate with SCMI
[ 12.735947]arm-scmi: probe of soc:qcom,scmi failed with error -110
Now when a message arrives at cpu slightly after the timeout, the mailbox
controller will try to call the rx_callback of the client and might end
up accessing freed memory.
[ 12.758363][ C0] Call trace:
[ 12.758367][ C0] rx_callback+0x24/0x160
[ 12.758372][ C0] mbox_chan_received_data+0x44/0x94
[ 12.758386][ C0] __handle_irq_event_percpu+0xd4/0x240
This patch frees the mailbox channels setup during probe and adds some more
error handling in case the probe fails.
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
---
drivers/firmware/arm_scmi/driver.c | 35 ++++++++++++++++++++++++-----------
1 file changed, 24 insertions(+), 11 deletions(-)
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 9b2e8d4..ead3bd3 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -1390,6 +1390,21 @@ void scmi_protocol_device_unrequest(const struct scmi_device_id *id_table)
mutex_unlock(&scmi_requested_devices_mtx);
}
+static int scmi_cleanup_txrx_channels(struct scmi_info *info)
+{
+ int ret;
+ struct idr *idr = &info->tx_idr;
+
+ ret = idr_for_each(idr, info->desc->ops->chan_free, idr);
+ idr_destroy(&info->tx_idr);
+
+ idr = &info->rx_idr;
+ ret = idr_for_each(idr, info->desc->ops->chan_free, idr);
+ idr_destroy(&info->rx_idr);
+
+ return ret;
+}
+
static int scmi_probe(struct platform_device *pdev)
{
int ret;
@@ -1430,7 +1445,7 @@ static int scmi_probe(struct platform_device *pdev)
ret = scmi_xfer_info_init(info);
if (ret)
- return ret;
+ goto clear_txrx_setup;
if (scmi_notification_init(handle))
dev_err(dev, "SCMI Notifications NOT available.\n");
@@ -1443,7 +1458,7 @@ static int scmi_probe(struct platform_device *pdev)
ret = scmi_protocol_acquire(handle, SCMI_PROTOCOL_BASE);
if (ret) {
dev_err(dev, "unable to communicate with SCMI\n");
- return ret;
+ goto notification_exit;
}
mutex_lock(&scmi_list_mutex);
@@ -1482,6 +1497,12 @@ static int scmi_probe(struct platform_device *pdev)
}
return 0;
+
+notification_exit:
+ scmi_notification_exit(&info->handle);
+clear_txrx_setup:
+ scmi_cleanup_txrx_channels(info);
+ return ret;
}
void scmi_free_channel(struct scmi_chan_info *cinfo, struct idr *idr, int id)
@@ -1493,7 +1514,6 @@ static int scmi_remove(struct platform_device *pdev)
{
int ret = 0, id;
struct scmi_info *info = platform_get_drvdata(pdev);
- struct idr *idr = &info->tx_idr;
struct device_node *child;
mutex_lock(&scmi_list_mutex);
@@ -1517,14 +1537,7 @@ static int scmi_remove(struct platform_device *pdev)
idr_destroy(&info->active_protocols);
/* Safe to free channels since no more users */
- ret = idr_for_each(idr, info->desc->ops->chan_free, idr);
- idr_destroy(&info->tx_idr);
-
- idr = &info->rx_idr;
- ret = idr_for_each(idr, info->desc->ops->chan_free, idr);
- idr_destroy(&info->rx_idr);
-
- return ret;
+ return scmi_cleanup_txrx_channels(info);
}
static ssize_t protocol_version_show(struct device *dev,
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next reply other threads:[~2021-08-04 21:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-04 21:19 Rishabh Bhatnagar [this message]
2021-08-05 10:54 ` [PATCH v3] firmware: arm_scmi: Free mailbox channels if probe fails Cristian Marussi
2021-08-30 21:09 ` rishabhb
2021-08-31 5:48 ` Cristian Marussi
2021-09-01 9:35 ` Cristian Marussi
2021-11-01 16:35 ` rishabhb
2021-11-02 11:32 ` Sudeep Holla
2021-11-04 23:40 ` rishabhb
2021-11-05 9:43 ` Cristian Marussi
2021-11-05 17:40 ` rishabhb
2021-11-07 10:34 ` Cristian Marussi
2021-11-07 18:22 ` Cristian Marussi
2021-11-08 17:58 ` rishabhb
2021-11-09 14:38 ` Cristian Marussi
2021-08-09 5:00 ` Sudeep Holla
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