crypto: caam: fix the DMA handle checking for the DMA maintainance

Fix the DMA handle checking for the DMA maintainance.
Should not call the dma_sync_single_for_device if the handle is NULL,
otherwise, kernel will throw out the following complains:

when do the following test:

insmod ./tcrypt.ko mode=402

Unable to handle kernel paging request at virtual address 70000000
pgd = d8c64000
[70000000] *pgd=00000000
Internal error: Oops: 805 [#1] PREEMPT SMP ARM
Modules linked in: tcrypt(+)
CPU: 1 PID: 789 Comm: insmod Not tainted 4.1.15-01516-g116e2fc-dirty #14
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
task: d8b54280 ti: d8882000 task.ti: d8882000
PC is at v7_dma_clean_range+0x20/0x38
LR is at dma_cache_maint_page+0xc8/0x22c
pc : [<8001e81c>]    lr : [<8001b018>]    psr: 200b0013
sp : d8883d08  ip : 8001e86c  fp : 000004c0
r10: 80b8b000  r9 : 80b244f8  r8 : ee557000
r7 : 00000000  r6 : 80b8f41c  r5 : 00000000  r4 : 70000000
r3 : 0000001f  r2 : 00000020  r1 : 70000000  r0 : 70000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 10c53c7d  Table: 68c6404a  DAC: 00000015
Process insmod (pid: 789, stack limit = 0xd8882210)
Stack: (0xd8883d08 to 0xd8884000)
3d00:                   ef26bfe0 00000002 00000018 00000001 00000000 00000000
3d20: ee557000 00000001 00000000 d86f0a10 00000000 d8bc2040 d8a7f5c4 8001b1a0
3d40: 8001e86c 8001b2c8 d88a5c40 d88a5c40 80b28bc4 d8a7f400 80beec48 8057f1dc
3d60: 00000002 00000000 00000000 00000038 00000018 80bdc1c0 68bc2128 d8a7f480
3d80: 00000000 80068c10 600b0013 00000100 00000000 d8a7f400 00000040 00000004
3da0: d871ca00 00000040 00000000 8057a9b0 8057a9a4 7f000d14 00000100 80068c10
3dc0: 7f005580 d8883de4 00000100 00000004 d8a7f400 7f005e80 7f005eb0 0000000c
3de0: d871ca00 00000040 00000100 7f0015ec 00000004 80b24648 00000000 00000000
3e00: d8bc2000 d8bc2040 00000008 ef26fa80 00000000 00001000 68c54000 ef26ae80
3e20: 00000000 00001000 00000000 ef270bc0 00000000 00001000 00000000 ef26db02
3e40: 00000000 00001000 00000000 00000000 02880288 d8883e54 d8883e54 00000000
3e60: 00000000 00000010 7f0062f8 80b27698 80b27698 d871ca00 d8882000 00000000
3e80: 00000008 7f003124 7f0062f8 80b27698 00000010 7f0062f8 80b27698 80b27698
3ea0: d871ca00 d8882000 00000000 7f009048 7f009000 00000000 80b27698 80009704
3ec0: 000000d0 ef26fa80 00000000 8040003e 00000001 00000001 d8883eec ef2709c0
3ee0: d8001f00 80b246bc 00000001 8040003e d8883f04 800905a8 00000001 00000001
3f00: d8883f14 d8001f00 000000d0 80b23260 00000008 7f0061a0 d871c3c0 0131e008
3f20: 0000017b 8000f684 d8882000 00000000 00000008 8008f968 00000000 00000000
3f40: 00000003 00000000 00000003 0131e008 0000017b 800906fc f0679000 0000b857
3f60: f0680070 f067ff25 f06840d0 0000671c 00006e8c 00000000 00000000 00000000
3f80: 0000001f 00000020 00000017 00000014 00000012 00000000 0131e018 00000008
3fa0: 0131e008 8000f500 0131e018 00000008 00000003 0131e008 00000000 00000000
3fc0: 0131e018 00000008 0131e008 0000017b 00000003 00000008 0131e008 00000008
3fe0: 7e8a6c38 7e8a6c28 0001f2c0 76f22340 600d0010 00000003 00000000 00000000
[<8001e81c>] (v7_dma_clean_range) from [<8001b018>] (dma_cache_maint_page+0xc8/0x22c)
[<8001b018>] (dma_cache_maint_page) from [<8001b1a0>] (__dma_page_cpu_to_dev+0x24/0x88)
[<8001b1a0>] (__dma_page_cpu_to_dev) from [<8057f1dc>] (ahash_update_first+0x3cc/0x6f4)
[<8057f1dc>] (ahash_update_first) from [<8057a9b0>] (ahash_update+0xc/0x10)
[<8057a9b0>] (ahash_update) from [<7f000d14>] (test_ahash_cycles+0x70/0x220 [tcrypt])
[<7f000d14>] (test_ahash_cycles [tcrypt]) from [<7f0015ec>] (test_ahash_speed.constprop.1+0x19c/0x25c [tcrypt])
[<7f0015ec>] (test_ahash_speed.constprop.1 [tcrypt]) from [<7f003124>] (do_test+0xff8/0x301c [tcrypt])
[<7f003124>] (do_test [tcrypt]) from [<7f009048>] (tcrypt_mod_init+0x48/0xa0 [tcrypt])
[<7f009048>] (tcrypt_mod_init [tcrypt]) from [<80009704>] (do_one_initcall+0x80/0x1d0)
[<80009704>] (do_one_initcall) from [<8008f968>] (do_init_module+0x58/0x1b4)
[<8008f968>] (do_init_module) from [<800906fc>] (SyS_finit_module+0x68/0x6c)
[<800906fc>] (SyS_finit_module) from [<8000f500>] (ret_fast_syscall+0x0/0x3c)
Code: e1a02312 e2423001 e1c00003 f57ff04f (ee070f3a)
---[ end trace 63ad5840e079f2a5 ]---

Signed-off-by: Jason Liu <jason.hui.liu@nxp.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index b1bbe2bbd222..7fa85c294611 100644
--- a/drivers/crypto/caam/caamhash.c
+++ b/drivers/crypto/caam/caamhash.c
@@ -1360,8 +1360,6 @@ static int ahash_digest(struct ahash_request *req)
 	}
 	edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) +
 			  DESC_JOB_IO_LEN;
-	edesc->sec4_sg_dma = dma_map_single(jrdev, edesc->sec4_sg,
-					    sec4_sg_bytes, DMA_TO_DEVICE);
 	edesc->sec4_sg_bytes = sec4_sg_bytes;
 	edesc->src_nents = src_nents;
 	edesc->chained = chained;
@@ -1386,7 +1384,8 @@ static int ahash_digest(struct ahash_request *req)
 	}
 	append_seq_in_ptr(desc, src_dma, req->nbytes, options);
 
-	dma_sync_single_for_device(jrdev, edesc->sec4_sg_dma,
+	if (edesc->sec4_sg_dma)
+		dma_sync_single_for_device(jrdev, edesc->sec4_sg_dma,
 				   edesc->sec4_sg_bytes, DMA_TO_DEVICE);
 
 	edesc->dst_dma = map_seq_out_ptr_result(desc, jrdev, req->result,
@@ -1768,7 +1767,8 @@ static int ahash_update_first(struct ahash_request *req)
 		if (ret)
 			return ret;
 
-		dma_sync_single_for_device(jrdev, edesc->sec4_sg_dma,
+		if (edesc->sec4_sg_dma)
+			dma_sync_single_for_device(jrdev, edesc->sec4_sg_dma,
 					   sec4_sg_bytes, DMA_TO_DEVICE);
 #ifdef DEBUG
 		print_hex_dump(KERN_ERR, "jobdesc@"__stringify(__LINE__)": ",