Commit 448ba904 authored by Andy Grover's avatar Andy Grover Committed by Nicholas Bellinger
Browse files

target: Allow non-supporting backends to set pi_prot_type to 0

Userspace tools assume if a value is read from configfs, it is valid
and will not cause an error if the same value is written back. The only
valid value for pi_prot_type for backends not supporting DIF is 0, so allow
this particular value to be set without returning an error.
Reported-by: default avatarKrzysztof Chojnowski <>
Signed-off-by: default avatarAndy Grover <>
Reviewed-by: default avatarSagi Grimberg <>
Cc: # 3.14+
Signed-off-by: default avatarNicholas Bellinger <>
parent d1db0eea
......@@ -936,6 +936,10 @@ int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
return 0;
if (!dev->transport->init_prot || !dev->transport->free_prot) {
/* 0 is only allowed value for non-supporting backends */
if (flag == 0)
return 0;
pr_err("DIF protection not supported by backend: %s\n",
return -ENOSYS;
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