[PATCH v2] NVMe: Use put_unaligned_be64

Vaishali Thakkar
2015-01-10T08:53:09Z

This patch introduces the use of function put_unaligned_be64.

This is done using Coccinelle and semantic patch used is as follows:

@a@
typedef u64, __be64, uint64_t;
{u64,__be64,uint64_t} e64;
identifier tmp;
expression ptr;
expression y,e;
type T;
@@

- tmp = cpu_to_be64(y);

<+... when != tmp
(
- memcpy(ptr, (T)&tmp, \(8\|sizeof(u64)\|sizeof(__be64)\|sizeof(uint64_t)\|sizeof(e64)\));
+ put_unaligned_be64(y,ptr);
|
- memcpy(ptr, (T)&tmp, ...);
+ put_unaligned_be64(y,ptr);
)
...+>
? tmp = e

@@ type T; identifier a.tmp; @@

- T tmp;
...when != tmp

Signed-off-by: Vaishali Thakkar <vthakkar1994@gmail.com>
--
Changes in v2:
-Shorten commit message and change subject line
-<asm/unaligned.h> has arch-specific knowlege of which of
the implementations needs to be used. So, include it instaed
of <linux/unaligned/access_ok.h>.

drivers/block/nvme-scsi.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/block/nvme-scsi.c b/drivers/block/nvme-scsi.c
index 5e78568..12893ef 100644
--- a/drivers/block/nvme-scsi.c
+++ b/drivers/block/nvme-scsi.c
@@ -43,6 +43,7 @@
#include <linux/types.h>
#include <scsi/sg.h>
#include <scsi/scsi.h>
+#include <asm/unaligned.h>

static int sg_version_num = 30534; /* 2 digits for each component */
@@ -1417,7 +1418,6 @@ static void nvme_trans_fill_read_cap(u8 *response, struct nvme_id_ns *id_ns,
u64 rlba;
u8 prot_en;
u8 p_type_lut[4] = {0, 0, 1, 2};
- __be64 tmp_rlba;
__be32 tmp_rlba_32;
__be32 tmp_len;

@@ -1434,9 +1434,8 @@ static void nvme_trans_fill_read_cap(u8 *response, struct nvme_id_ns *id_ns,
memcpy(response, &tmp_rlba_32, sizeof(u32));
memcpy(&response[4], &tmp_len, sizeof(u32));
} else {
- tmp_rlba = cpu_to_be64(rlba);
tmp_len = cpu_to_be32(lba_length);
- memcpy(response, &tmp_rlba, sizeof(u64));
+ put_unaligned_be64(rlba, response);
memcpy(&response[8], &tmp_len, sizeof(u32));
response[12] = (p_type_lut[id_ns->dps & 0x3] << 1) | prot_en;
/* P_I_Exponent = 0x0 | LBPPBE = 0x0 */
--
1.9.1