linux-kernel - Re: [PATCH 2/2 v2] scsi: add scsi trace core function and put trace points

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Date:	Tue, 02 Feb 2010 18:12:00 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Kei Tokunaga <tokunaga.keiich@...fujitsu.com>
Cc:	linux-scsi@...r.kernel.org,
	James Bottomley <James.Bottomley@...e.de>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Martin Peterson <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Joe Perches <joe@...ches.com>,
	Tomohiro Kusumi <kusumi.tomohiro@...fujitsu.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Subject: Re: [PATCH 2/2 v2] scsi: add scsi trace core function and put trace points

>>>>> "Kei" == Kei Tokunaga <tokunaga.keiich@...fujitsu.com> writes:

I'm traveling so I won't have time to look at this closely until next
week.  However, this caught my eye:

+static const char *
+scsi_trace_varlen(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	switch (SERVICE_ACTION(cdb)) {
+	case READ_32:
+	case WRITE_32:
+		/* if protection is enabled */
+		if (((cdb[10] >> 5) & 0x7) == 1)
+			return scsi_trace_rw32(p, cdb, len);
+		/* fall through */
+	default:
+		return scsi_trace_misc(p, cdb, len);
+	}
+}

It is not a requirement that a 32-byte READ/WRITE request must have
PROTECT set.  So that if statement is bogus.

-- 
Martin K. Petersen	Oracle Linux Engineering
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