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Subject[PATCH 2/2] platform/x86: dell-smbios-wmi: release mutex lock on WMI call failure
Date
Unbound devices may race with calling this function causing the mutex
to stay locked. This failure mode should have released the mutex too.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
---
drivers/platform/x86/dell-smbios-wmi.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/dell-smbios-wmi.c b/drivers/platform/x86/dell-smbios-wmi.c
index 35c13815..5cf9b13 100644
--- a/drivers/platform/x86/dell-smbios-wmi.c
+++ b/drivers/platform/x86/dell-smbios-wmi.c
@@ -91,8 +91,10 @@ int dell_smbios_wmi_call(struct calling_interface_buffer *buffer)

mutex_lock(&call_mutex);
priv = get_first_smbios_priv();
- if (!priv)
- return -ENODEV;
+ if (!priv) {
+ ret = -ENODEV;
+ goto out_wmi_call;
+ }

size = sizeof(struct calling_interface_buffer);
difference = priv->req_buf_size - sizeof(u64) - size;
@@ -101,6 +103,7 @@ int dell_smbios_wmi_call(struct calling_interface_buffer *buffer)
memcpy(&priv->buf->std, buffer, size);
ret = run_smbios_call(priv->wdev);
memcpy(buffer, &priv->buf->std, size);
+out_wmi_call:
mutex_unlock(&call_mutex);

return ret;
--
2.7.4
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