4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vaibhav Jain <vaibhav@xxxxxxxxxxxxx>
commit ef6cb5f1a048fdf91ccee6d63d2bfa293338502d upstream.
Function atomic_inc_unless_negative() returns a bool to indicate
success/failure. However cxl_adapter_context_get() wrongly compares
the return value against '>=0' which will always be true. The patch
fixes this comparison to '==0' there by also fixing this compile time
warning:
drivers/misc/cxl/main.c:290 cxl_adapter_context_get()
warn: 'atomic_inc_unless_negative(&adapter->contexts_num)' is unsigned
Fixes: 70b565bbdb91 ("cxl: Prevent adapter reset if an active context exists")
Cc: stable@xxxxxxxxxxxxxxx # v4.9+
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Vaibhav Jain <vaibhav@xxxxxxxxxxxxx>
Acked-by: Andrew Donnellan <andrew.donnellan@xxxxxxxxxxx>
Acked-by: Frederic Barrat <fbarrat@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/cxl/main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/misc/cxl/main.c
+++ b/drivers/misc/cxl/main.c
@@ -293,7 +293,7 @@ int cxl_adapter_context_get(struct cxl *
int rc;
rc = atomic_inc_unless_negative(&adapter->contexts_num);
- return rc >= 0 ? 0 : -EBUSY;
+ return rc ? 0 : -EBUSY;
}
void cxl_adapter_context_put(struct cxl *adapter)
