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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jayamohan Kallickal <jayamohan.kallickal@emulex.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>,
	linux-scsi@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] [SCSI] be2iscsi: cleanup a min_t() call
Date: Mon, 26 Sep 2011 06:23:37 +0000	[thread overview]
Message-ID: <20110926062337.GD11832@elgon.mountain> (raw)

"sense_len" was declared as int type but actually it only stores a
u16 value that comes from hardware.  The cast to u16 in min_t()
confuses static analysis because it truncates the int to u16 so I've
fixed the declaration to reflect that "sense_len" is just a u16.

Also there was a call to cpu_to_be16() which I've changed to
be16_to_cpu().  The functions are equivalent, but obviously the
hardware is big endian and we're doing the min_t() comparison on CPU
endian values.

This whole patch is just a cleanup and doesn't affect how the code
works.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
Compile tested only.  Sorry.

diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 57fea38..344af8d 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -1104,7 +1104,6 @@ be_complete_io(struct beiscsi_conn *beiscsi_conn,
 	struct be_status_bhs *sts_bhs  				(struct be_status_bhs *)io_task->cmd_bhs;
 	struct iscsi_conn *conn = beiscsi_conn->conn;
-	unsigned int sense_len;
 	unsigned char *sense;
 	u32 resid = 0, exp_cmdsn, max_cmdsn;
 	u8 rsp, status, flags;
@@ -1147,9 +1146,11 @@ be_complete_io(struct beiscsi_conn *beiscsi_conn,
 	}
 
 	if (status = SAM_STAT_CHECK_CONDITION) {
+		u16 sense_len;
 		unsigned short *slen = (unsigned short *)sts_bhs->sense_info;
+
 		sense = sts_bhs->sense_info + sizeof(unsigned short);
-		sense_len =  cpu_to_be16(*slen);
+		sense_len = be16_to_cpu(*slen);
 		memcpy(task->sc->sense_buffer, sense,
 		       min_t(u16, sense_len, SCSI_SENSE_BUFFERSIZE));
 	}

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jayamohan Kallickal <jayamohan.kallickal@emulex.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>,
	linux-scsi@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] [SCSI] be2iscsi: cleanup a min_t() call
Date: Mon, 26 Sep 2011 09:23:37 +0300	[thread overview]
Message-ID: <20110926062337.GD11832@elgon.mountain> (raw)

"sense_len" was declared as int type but actually it only stores a
u16 value that comes from hardware.  The cast to u16 in min_t()
confuses static analysis because it truncates the int to u16 so I've
fixed the declaration to reflect that "sense_len" is just a u16.

Also there was a call to cpu_to_be16() which I've changed to
be16_to_cpu().  The functions are equivalent, but obviously the
hardware is big endian and we're doing the min_t() comparison on CPU
endian values.

This whole patch is just a cleanup and doesn't affect how the code
works.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
Compile tested only.  Sorry.

diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 57fea38..344af8d 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -1104,7 +1104,6 @@ be_complete_io(struct beiscsi_conn *beiscsi_conn,
 	struct be_status_bhs *sts_bhs =
 				(struct be_status_bhs *)io_task->cmd_bhs;
 	struct iscsi_conn *conn = beiscsi_conn->conn;
-	unsigned int sense_len;
 	unsigned char *sense;
 	u32 resid = 0, exp_cmdsn, max_cmdsn;
 	u8 rsp, status, flags;
@@ -1147,9 +1146,11 @@ be_complete_io(struct beiscsi_conn *beiscsi_conn,
 	}
 
 	if (status == SAM_STAT_CHECK_CONDITION) {
+		u16 sense_len;
 		unsigned short *slen = (unsigned short *)sts_bhs->sense_info;
+
 		sense = sts_bhs->sense_info + sizeof(unsigned short);
-		sense_len =  cpu_to_be16(*slen);
+		sense_len = be16_to_cpu(*slen);
 		memcpy(task->sc->sense_buffer, sense,
 		       min_t(u16, sense_len, SCSI_SENSE_BUFFERSIZE));
 	}

             reply	other threads:[~2011-09-26  6:23 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-26  6:23 Dan Carpenter [this message]
2011-09-26  6:23 ` [patch] [SCSI] be2iscsi: cleanup a min_t() call Dan Carpenter
2011-11-18 14:00 ` Dan Carpenter
2011-11-18 14:00   ` Dan Carpenter
2011-11-18 19:28 ` Mike Christie
2011-11-18 19:28   ` Mike Christie
2011-11-29 20:55   ` Jayamohan.Kallickal
2011-11-29 20:55     ` Jayamohan.Kallickal

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