On Fri, 2013-01-18 at 11:27 -0500, Ewan D. Milne wrote:
> --- a/drivers/scsi/scsi_error.c
> +++ b/drivers/scsi/scsi_error.c
> @@ -241,6 +241,9 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
> if (! scsi_command_normalize_sense(scmd, &sshdr))
> return FAILED; /* no valid sense data */
>
> + if (sshdr.overflow)
> + scmd_printk(KERN_WARNING, scmd, "Sense data overflow");
> +
> if (scsi_sense_is_deferred(&sshdr))
> return NEEDS_RETRY;
>
> @@ -2059,14 +2062,18 @@ int scsi_normalize_sense(const u8 *sense_buffer, int
> sb_len,
> sshdr->asc = sense_buffer[2];
> if (sb_len > 3)
> sshdr->ascq = sense_buffer[3];
> + if (sb_len > 4)
> + sshdr->overflow = ((sense_buffer[4] & 0x80) != 0);
> if (sb_len > 7)
> sshdr->additional_length = sense_buffer[7];
> } else {
> /*
> * fixed format
> */
> - if (sb_len > 2)
> + if (sb_len > 2) {
> + sshdr->overflow = ((sense_buffer[2] & 0x10) != 0);
> sshdr->sense_key = (sense_buffer[2] & 0xf);
> + }
> if (sb_len > 7) {
> sb_len = (sb_len < (sense_buffer[7] + 8)) ?
> sb_len : (sense_buffer[7] + 8);
This isn't the right way to do it: The overflow bit is a recent
introduction in SPC-4. The correct way to tell if we have an overflow
or not is to look at the additional sense length and compare it to the
allocation length; this will work for everything.
I'm not even convinced that overflow is important: for a lot of the
sense probes, we deliberately induce overflows by giving the request
sense command a short buffer. Printing a warning in scsi_check_sense
will get very noisy very fast.
James
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