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firmware: arm_scmi: Free mailbox channels if probe fails

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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.

    | arm-scmi soc:qcom,scmi: timed out in resp(caller: version_get+0x84/0x140)
    | arm-scmi soc:qcom,scmi: unable to communicate with SCMI
    | 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.

     | rx_callback+0x24/0x160
     | mbox_chan_received_data+0x44/0x94
     | __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.

Link: https://lore.kernel.org/r/1628111999-21595-1-git-send-email-rishabhb@codeaurora.org
Tested-by: Cristian Marussi <cristian.marussi@arm.com>
Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Rishabh Bhatnagar 2021-08-04 14:19:59 -07:00 committed by Sudeep Holla
parent 46abe13b5e
commit 1e7cbfaa66
1 changed files with 24 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/firmware/arm_scmi/driver.c
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@ -1787,6 +1787,21 @@ 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;
@ -1833,7 +1848,7 @@ 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");
@ -1846,7 +1861,7 @@ 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);
@ -1885,6 +1900,12 @@ 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)
@ -1896,7 +1917,6 @@ 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);
@ -1920,14 +1940,7 @@ 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,