Messages in this thread Patch in this message | | | Date | Wed, 29 Sep 2021 12:05:49 -0700 | Subject | [PATCH v2] driver core: Reject pointless SYNC_STATE_ONLY device links | From | Saravana Kannan <> |
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SYNC_STATE_ONLY device links intentionally allow cycles because cyclic sync_state() dependencies are valid and necessary.
However a SYNC_STATE_ONLY device link where the consumer and the supplier are the same device is pointless because the device link would be deleted as soon as the device probes (because it's also the consumer) and won't affect when the sync_state() callback is called. It's a waste of CPU cycles and memory to create this device link. So reject any attempts to create such a device link.
Fixes: 05ef983e0d65 ("driver core: Add device link support for SYNC_STATE_ONLY flag") Reported-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Saravana Kannan <saravanak@google.com> --- v1 -> v2: - Moved the check higher up in the function.
drivers/base/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c index 15986cc2fe5e..249da496581a 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -687,7 +687,8 @@ struct device_link *device_link_add(struct device *consumer, { struct device_link *link; - if (!consumer || !supplier || flags & ~DL_ADD_VALID_FLAGS || + if (!consumer || !supplier || consumer == supplier || + flags & ~DL_ADD_VALID_FLAGS || (flags & DL_FLAG_STATELESS && flags & DL_MANAGED_LINK_FLAGS) || (flags & DL_FLAG_SYNC_STATE_ONLY && (flags & ~DL_FLAG_INFERRED) != DL_FLAG_SYNC_STATE_ONLY) || -- 2.33.0.685.g46640cef36-goog
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