[PATCH] cxl: Fix lockdep warning while creating afu_err_buff attribute

Vaibhav Jain vaibhav at linux.vnet.ibm.com
Wed Sep 23 13:07:59 AEST 2015

Presently a lockdep warning is reported during creation of afu_err_buff
bin_attribute for the afu. This is caused due to the variable attr.key
not pointing to a static class key, hence the function lockdep_init_map
reports this warning:

 BUG: key <some-address> not in .data!

The patch fixes this issue by calling sysfs_attr_init on the
attr_eb.attr structure before populating it with the afu_err_buff file
details. This will populate the attr.key variable with a static class
key so that lockdep_init_map stops complaining about the lockdep key not
being static.

Reported-by: Daniel Axtens <dja at axtens.net>
Signed-off-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
 drivers/misc/cxl/sysfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/misc/cxl/sysfs.c b/drivers/misc/cxl/sysfs.c
index 25868c2..02006f7 100644
--- a/drivers/misc/cxl/sysfs.c
+++ b/drivers/misc/cxl/sysfs.c
@@ -592,6 +592,8 @@ int cxl_sysfs_afu_add(struct cxl_afu *afu)
 	/* conditionally create the add the binary file for error info buffer */
 	if (afu->eb_len) {
+		sysfs_attr_init(&afu->attr_eb.attr);
 		afu->attr_eb.attr.name = "afu_err_buff";
 		afu->attr_eb.attr.mode = S_IRUGO;
 		afu->attr_eb.size = afu->eb_len;

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