Re: WARNING: CPU: 3 PID: 2952 at drivers/base/firmware_class.c:1225 _request_firmware+0x329/0x890

quoted

Found this thread google searching.


4.13.0-0.rc4.git1.1.fc27.x86_64  Problem sometimes happens with this kernel.
This translates to git 623ce3456671.

4.13.0-0.rc3.git0.1.fc27.x86_64 But not this kernel, which translates
to the actual rc3 release (clean).

It seems to be a regression between those two. The problem only
happens when waking from suspend to RAM, but it doesn't always happen.

My theory is that if you request firmware when firmware_class is in
cache mode consecutively, and the device is changed, you will hit this
issue.
Can you give this patch a try?

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index bfbe1e154128..910dce498f53 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c

@@ -1177,6 +1177,9 @@ _request_firmware_prepare(struct firmware

**firmware_p, const char *name,

       ret = fw_lookup_and_allocate_buf(name, &fw_cache, &buf, dbuf, size);

+       if (!firmware_enabled() && device && (ret == 0 || ret == 1))
+               fw_add_devm_name(device, buf->fw_id);
+
       /*
        * bind with 'buf' now to avoid warning in failure path
        * of requesting firmware.