linux-kernel - [PATCH] scsi: esas2r: use ktime_get_real

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Message-Id: <20171110153947.1932747-1-arnd@arndb.de>
Date:   Fri, 10 Nov 2017 16:39:34 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Bradley Grove <linuxdrivers@...otech.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: esas2r: use ktime_get_real_seconds()

do_gettimeofday() is deprecated because of the y2038 overflow.
Here, we use the result to pass into a 32-bit field in the firmware,
which still risks an overflow, but if the firmware is written
to expect unsigned values, it can at least last until y2106,
and there is not much we can do about it.

This changes do_gettimeofday() to ktime_get_real_seconds(), which
at least simplifies the code a bit, and avoids the deprecated
interface. I'm adding a comment about the overflow to document
what happens.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/scsi/esas2r/esas2r_init.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/esas2r/esas2r_init.c b/drivers/scsi/esas2r/esas2r_init.c
index 5b14dd29b764..67b3e3354e3c 100644
--- a/drivers/scsi/esas2r/esas2r_init.c
+++ b/drivers/scsi/esas2r/esas2r_init.c
@@ -1223,8 +1223,6 @@ static bool esas2r_format_init_msg(struct esas2r_adapter *a,
 	case ESAS2R_INIT_MSG_START:
 	case ESAS2R_INIT_MSG_REINIT:
 	{
-		struct timeval now;
-		do_gettimeofday(&now);
 		esas2r_hdebug("CFG init");
 		esas2r_build_cfg_req(a,
 				     rq,
@@ -1233,7 +1231,8 @@ static bool esas2r_format_init_msg(struct esas2r_adapter *a,
 				     NULL);
 		ci = (struct atto_vda_cfg_init *)&rq->vrq->cfg.data.init;
 		ci->sgl_page_size = cpu_to_le32(sgl_page_size);
-		ci->epoch_time = cpu_to_le32(now.tv_sec);
+		/* firmware interface overflows in y2106 */
+		ci->epoch_time = cpu_to_le32(ktime_get_real_seconds());
 		rq->flags |= RF_FAILURE_OK;
 		a->init_msg = ESAS2R_INIT_MSG_INIT;
 		break;
-- 
2.9.0