Kevin Nash -- WWE LIFTS SUSPENSION ... After Criminal Charges Dropped

Kevin Nash's days in wrestling purgatory are OVER -- the WWE has reinstated the icon after officials dropped the charges in his Xmas Eve father-son brawl.

Vince McMahon's company had put Big Sexy's contract on ice once he was arrested for allegedly battering his 18-year-old son Tristen during a rumble in their Florida home.

But after investigators determined Nash wasn't the primary aggressor -- charges were dropped ... and now the WWE is welcoming the 55-year-old back with open arms.

"Now that Kevin Nash’s legal matter has been resolved with all charges being dropped, his 'legends' contract has been immediately reinstated," the WWE tells us.

But it seems Nash is still upset with the org. for putting him on time-out in the first place ... and earlier this week tweeted that he doesn't see himself returning to WWE programming.