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net: dsa: make dp->bridge_num one-based
I have seen too many bugs already due to the fact that we must encode an invalid dp->bridge_num as a negative value, because the natural tendency is to check that invalid value using (!dp->bridge_num). Latest example can be seen in commit 1bec0f0 ("net: dsa: fix bridge_num not getting cleared after ports leaving the bridge"). Convert the existing users to assume that dp->bridge_num == 0 is the encoding for invalid, and valid bridge numbers start from 1. Signed-off-by: Vladimir Oltean <[email protected]> Reviewed-by: Alvin Šipraga <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]>
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