From: Anil kumar <anils_r@yahoo.com>
To: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: scsi_cmnd data_buffer checksum
Date: Wed, 8 Sep 2010 20:36:32 -0700 (PDT) [thread overview]
Message-ID: <35352.83946.qm@web32402.mail.mud.yahoo.com> (raw)
I am writing a checksum calculation of scsi_cmnd data buffer in the driver.
I calculate the checksum of the scsi_cmd data buffer(request_buffer) in driver queuecommand.
Now when the command is completed from the hardware and before driver sends it back to mid-layer, I calculate the checksum again of the same scsi_cmd data_buffer again.
Sometimes the checksums don't match. I mean somehow looks like OS changed the scsi_cmd data_buffer(request_buffer) in the meantime when driver is working on the command.
I print the address of the scsi_cmd data_buffer (virtual address) and its same and the contents of the buffer is also same during both the calculations.
Can this happen?
next reply other threads:[~2010-09-09 3:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-09 3:36 Anil kumar [this message]
2010-09-09 8:00 ` scsi_cmnd data_buffer checksum Christof Schmitt
2010-09-09 8:35 ` Anil kumar
2010-09-09 8:51 ` Christof Schmitt
2010-09-09 9:09 ` Anil kumar
2010-09-09 9:29 ` Christof Schmitt
2010-09-09 13:23 ` Martin K. Petersen
2010-09-09 19:34 ` Anil kumar
2010-09-10 3:33 ` Martin K. Petersen
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