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[16/17] cxlflash: Remove zeroing of private command data

Message ID 1498097804-9265-1-git-send-email-ukrishn@linux.vnet.ibm.com (mailing list archive)
State Accepted
Headers show

Commit Message

Uma Krishnan June 22, 2017, 2:16 a.m. UTC 
From: "Matthew R. Ochs" <mrochs@linux.vnet.ibm.com>

The SCSI core now zeroes the per-command private data area prior to
calling into the LLD. Replace the clearing operation that takes place
when the private command data reference is obtained with a routine that
performs common initializations. The zeroing that takes place in the
device reset path remains intact as the private command data associated
with the specified SCSI command is not guaranteed to be cleared.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
---
 drivers/scsi/cxlflash/common.h | 11 +++++++++--
 drivers/scsi/cxlflash/main.c   |  2 +-
 2 files changed, 10 insertions(+), 3 deletions(-)
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Patch

diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h
index e95e5a5..6d95e8e 100644
--- a/drivers/scsi/cxlflash/common.h
+++ b/drivers/scsi/cxlflash/common.h
@@ -178,15 +178,22 @@  static inline struct afu_cmd *sc_to_afuc(struct scsi_cmnd *sc)
 	return PTR_ALIGN(scsi_cmd_priv(sc), __alignof__(struct afu_cmd));
 }
 
-static inline struct afu_cmd *sc_to_afucz(struct scsi_cmnd *sc)
+static inline struct afu_cmd *sc_to_afuci(struct scsi_cmnd *sc)
 {
 	struct afu_cmd *afuc = sc_to_afuc(sc);
 
-	memset(afuc, 0, sizeof(*afuc));
 	INIT_LIST_HEAD(&afuc->queue);
 	return afuc;
 }
 
+static inline struct afu_cmd *sc_to_afucz(struct scsi_cmnd *sc)
+{
+	struct afu_cmd *afuc = sc_to_afuc(sc);
+
+	memset(afuc, 0, sizeof(*afuc));
+	return sc_to_afuci(sc);
+}
+
 struct hwq {
 	/* Stuff requiring alignment go first. */
 	struct sisl_ioarcb sq[NUM_SQ_ENTRY];		/* 16K SQ */
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 0cce442..4338982 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -543,7 +543,7 @@  static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp)
 	struct cxlflash_cfg *cfg = shost_priv(host);
 	struct afu *afu = cfg->afu;
 	struct device *dev = &cfg->dev->dev;
-	struct afu_cmd *cmd = sc_to_afucz(scp);
+	struct afu_cmd *cmd = sc_to_afuci(scp);
 	struct scatterlist *sg = scsi_sglist(scp);
 	int hwq_index = cmd_to_target_hwq(host, scp, afu);
 	struct hwq *hwq = get_hwq(afu, hwq_index);