4.9-stable review patch. If anyone has any objections, please let me know.
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From: Vaibhav Jain vaibhav@linux.ibm.com
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@vger.kernel.org # v4.9+ Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Vaibhav Jain vaibhav@linux.ibm.com Acked-by: Andrew Donnellan andrew.donnellan@au1.ibm.com Acked-by: Frederic Barrat fbarrat@linux.vnet.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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)