crypto: caam/jr - Remove spinlock for output job ring

For each job ring pair, the output ring is processed exactly by one cpu
at a time under a tasklet context (one per ring). Therefore, there is no
need to protect a job ring's access & its private data structure using a
lock. Hence the lock can be removed.

Signed-off-by: Vakul Garg <[email protected]>
Reviewed-by: Horia Geanta <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

Author: nxa22042

drivers/crypto/caam/intern.h

@@ -56,7 +56,6 @@ struct caam_drv_private_jr {
 	u32 inpring_avail;	/* Number of free entries in input ring */
 	int head;			/* entinfo (s/w ring) head index */
 	dma_addr_t *inpring;	/* Base of input ring, alloc DMA-safe */
-	spinlock_t outlock ____cacheline_aligned; /* Output ring index lock */
 	int out_ring_read_index;	/* Output index "tail" */
 	int tail;			/* entinfo (s/w ring) tail index */
 	struct jr_outentry *outring;	/* Base of output ring, DMA-safe */

drivers/crypto/caam/jr.c

@@ -177,8 +177,6 @@ static void caam_jr_dequeue(unsigned long devarg)
 
 		head = READ_ONCE(jrp->head);
 
-		spin_lock(&jrp->outlock);
-
 		sw_idx = tail = jrp->tail;
 		hw_idx = jrp->out_ring_read_index;
 
@@ -201,7 +199,7 @@ static void caam_jr_dequeue(unsigned long devarg)
 		/* mark completed, avoid matching on a recycled desc addr */
 		jrp->entinfo[sw_idx].desc_addr_dma = 0;
 
-		/* Stash callback params for use outside of lock */
+		/* Stash callback params */
 		usercall = jrp->entinfo[sw_idx].callbk;
 		userarg = jrp->entinfo[sw_idx].cbkarg;
 		userdesc = jrp->entinfo[sw_idx].desc_addr_virt;
@@ -234,8 +232,6 @@ static void caam_jr_dequeue(unsigned long devarg)
 			jrp->tail = tail;
 		}
 
-		spin_unlock(&jrp->outlock);
-
 		/* Finally, execute user's callback */
 		usercall(dev, userdesc, userstatus, userarg);
 		outring_used--;
@@ -452,7 +448,6 @@ static int caam_jr_init(struct device *dev)
 	jrp->inpring_avail = JOBR_DEPTH;
 
 	spin_lock_init(&jrp->inplock);
-	spin_lock_init(&jrp->outlock);
 
 	/* Select interrupt coalescing parameters */
 	clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JOBR_INTC |