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scsi: sd: Only print updates to permanent stream count

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Just rescanning a partition causes a print similar to the following to
appear:

[    1.484964] sd 0:0:0:0: [sda] permanent stream count = 5

This is bothersome, so only print this message for an update.

Fixes: 4f53138fff ("scsi: sd: Translate data lifetime information")
Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240412094407.496251-1-john.g.garry@oracle.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
John Garry 2024-04-12 09:44:07 +00:00 committed by Martin K. Petersen
parent ca91259b77
commit 961990efc6
1 changed files with 3 additions and 1 deletions
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4
drivers/scsi/sd.c
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@ -3120,6 +3120,7 @@ static void sd_read_io_hints(struct scsi_disk *sdkp, unsigned char *buffer)
{
struct scsi_device *sdp = sdkp->device;
const struct scsi_io_group_descriptor *desc, *start, *end;
u16 permanent_stream_count_old;
struct scsi_sense_hdr sshdr;
struct scsi_mode_data data;
int res;
@ -3140,12 +3141,13 @@ static void sd_read_io_hints(struct scsi_disk *sdkp, unsigned char *buffer)
for (desc = start; desc < end; desc++)
if (!desc->st_enble || !sd_is_perm_stream(sdkp, desc - start))
break;
permanent_stream_count_old = sdkp->permanent_stream_count;
sdkp->permanent_stream_count = desc - start;
if (sdkp->rscs && sdkp->permanent_stream_count < 2)
sd_printk(KERN_INFO, sdkp,
"Unexpected: RSCS has been set and the permanent stream count is %u\n",
sdkp->permanent_stream_count);
else if (sdkp->permanent_stream_count)
else if (sdkp->permanent_stream_count != permanent_stream_count_old)
sd_printk(KERN_INFO, sdkp, "permanent stream count = %d\n",
sdkp->permanent_stream_count);
}