RDMA/qib: Remove all occurrences of BUG_ON()

QIB driver was added in 2010 with many BUG_ON(), most of them were cleaned
out after years of development and usages.

It looks like that it is safe now to remove rest of BUG_ONs.
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/qib/qib_iba6120.c

@@ -3237,7 +3237,6 @@ static int init_6120_variables(struct qib_devdata *dd)
 	/* we always allocate at least 2048 bytes for eager buffers */
 	ret = ib_mtu_enum_to_int(qib_ibmtu);
 	dd->rcvegrbufsize = ret != -1 ? max(ret, 2048) : QIB_DEFAULT_MTU;
-	BUG_ON(!is_power_of_2(dd->rcvegrbufsize));
 	dd->rcvegrbufsize_shift = ilog2(dd->rcvegrbufsize);
 
 	qib_6120_tidtemplate(dd);

drivers/infiniband/hw/qib/qib_iba7220.c

@@ -4043,7 +4043,6 @@ static int qib_init_7220_variables(struct qib_devdata *dd)
 	/* we always allocate at least 2048 bytes for eager buffers */
 	ret = ib_mtu_enum_to_int(qib_ibmtu);
 	dd->rcvegrbufsize = ret != -1 ? max(ret, 2048) : QIB_DEFAULT_MTU;
-	BUG_ON(!is_power_of_2(dd->rcvegrbufsize));
 	dd->rcvegrbufsize_shift = ilog2(dd->rcvegrbufsize);
 
 	qib_7220_tidtemplate(dd);
@@ -4252,7 +4251,6 @@ static int init_sdma_7220_regs(struct qib_pportdata *ppd)
 		unsigned word = i / 64;
 		unsigned bit = i & 63;
 
-		BUG_ON(word >= 3);
 		senddmabufmask[word] |= 1ULL << bit;
 	}
 	qib_write_kreg(dd, kr_senddmabufmask0, senddmabufmask[0]);

drivers/infiniband/hw/qib/qib_iba7322.c

@@ -1382,7 +1382,6 @@ static void err_decode(char *msg, size_t len, u64 errs,
 					*msg++ = ',';
 					len--;
 				}
-				BUG_ON(!msp->sz);
 				/* msp->sz counts the nul */
 				took = min_t(size_t, msp->sz - (size_t)1, len);
 				memcpy(msg,  msp->msg, took);
@@ -6599,7 +6598,6 @@ static int qib_init_7322_variables(struct qib_devdata *dd)
 
 	/* we always allocate at least 2048 bytes for eager buffers */
 	dd->rcvegrbufsize = max(mtu, 2048);
-	BUG_ON(!is_power_of_2(dd->rcvegrbufsize));
 	dd->rcvegrbufsize_shift = ilog2(dd->rcvegrbufsize);
 
 	qib_7322_tidtemplate(dd);
@@ -6904,7 +6902,6 @@ static int init_sdma_7322_regs(struct qib_pportdata *ppd)
 		unsigned word = erstbuf / BITS_PER_LONG;
 		unsigned bit = erstbuf & (BITS_PER_LONG - 1);
 
-		BUG_ON(word >= 3);
 		senddmabufmask[word] |= 1ULL << bit;
 	}
 	qib_write_kreg_port(ppd, krp_senddmabufmask0, senddmabufmask[0]);

drivers/infiniband/hw/qib/qib_init.c

@@ -209,7 +209,6 @@ struct qib_ctxtdata *qib_create_ctxtdata(struct qib_pportdata *ppd, u32 ctxt,
 		rcd->rcvegrbuf_chunks = (rcd->rcvegrcnt +
 			rcd->rcvegrbufs_perchunk - 1) /
 			rcd->rcvegrbufs_perchunk;
-		BUG_ON(!is_power_of_2(rcd->rcvegrbufs_perchunk));
 		rcd->rcvegrbufs_perchunk_shift =
 			ilog2(rcd->rcvegrbufs_perchunk);
 	}

drivers/infiniband/hw/qib/qib_sdma.c

@@ -572,7 +572,6 @@ int qib_sdma_verbs_send(struct qib_pportdata *ppd,
 			len = sge->length;
 		if (len > sge->sge_length)
 			len = sge->sge_length;
-		BUG_ON(len == 0);
 		dw = (len + 3) >> 2;
 		addr = dma_map_single(&ppd->dd->pcidev->dev, sge->vaddr,
 				      dw << 2, DMA_TO_DEVICE);

drivers/infiniband/hw/qib/qib_ud.c

@@ -178,7 +178,6 @@ static void qib_ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
 			len = length;
 		if (len > sge->sge_length)
 			len = sge->sge_length;
-		BUG_ON(len == 0);
 		rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false);
 		sge->vaddr += len;
 		sge->length -= len;

drivers/infiniband/hw/qib/qib_user_sdma.c

@@ -237,7 +237,6 @@ qib_user_sdma_queue_create(struct device *dev, int unit, int ctxt, int sctxt)
 
 		ret = qib_user_sdma_rb_insert(&qib_user_sdma_rb_root,
 					sdma_rb_node);
-		BUG_ON(ret == 0);
 	}
 	pq->sdma_rb_node = sdma_rb_node;
 

drivers/infiniband/hw/qib/qib_verbs.c

@@ -150,7 +150,6 @@ static u32 qib_count_sge(struct rvt_sge_state *ss, u32 length)
 			len = length;
 		if (len > sge.sge_length)
 			len = sge.sge_length;
-		BUG_ON(len == 0);
 		if (((long) sge.vaddr & (sizeof(u32) - 1)) ||
 		    (len != length && (len & (sizeof(u32) - 1)))) {
 			ndesc = 0;
@@ -193,7 +192,6 @@ static void qib_copy_from_sge(void *data, struct rvt_sge_state *ss, u32 length)
 			len = length;
 		if (len > sge->sge_length)
 			len = sge->sge_length;
-		BUG_ON(len == 0);
 		memcpy(data, sge->vaddr, len);
 		sge->vaddr += len;
 		sge->length -= len;
@@ -449,7 +447,6 @@ static void copy_io(u32 __iomem *piobuf, struct rvt_sge_state *ss,
 			len = length;
 		if (len > ss->sge.sge_length)
 			len = ss->sge.sge_length;
-		BUG_ON(len == 0);
 		/* If the source address is not aligned, try to align it. */
 		off = (unsigned long)ss->sge.vaddr & (sizeof(u32) - 1);
 		if (off) {