linux-kernel - [PATCH] scsi: sd: print write through due to no caching mode page as warning

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Date:   Wed, 13 Oct 2021 09:50:50 +0200
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     martin.kepplinger@...i.sm
Cc:     bvanassche@....org, dgilbert@...erlog.com, jejb@...ux.ibm.com,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        martin.petersen@...cle.com
Subject: [PATCH] scsi: sd: print write through due to no caching mode page as warning

For SD cardreaders it's extremely common not to find cache on disk.
The following error messages are thus very common and don't point
to a real error one could try to fix but rather describe how the disk
works:

sd 0:0:0:0: [sda] No Caching mode page found
sd 0:0:0:0: [sda] Assuming drive cache: write through

Print these messages as warnings instead of errors.

Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
---

hi Bart and all who it may concern,

I only resending the same patch I sent in January before:
https://lore.kernel.org/linux-scsi/20210122083000.32598-1-martin.kepplinger@puri.sm/

I like it more when messages printed as errors point to real problems that
need fixing.

thanks,
                         martin




 drivers/scsi/sd.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a646d27df681..33ea36b41136 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2793,7 +2793,8 @@ sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
 			}
 		}
 
-		sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
+		sd_first_printk(KERN_WARNING, sdkp,
+				"No Caching mode page found\n");
 		goto defaults;
 
 	Page_found:
@@ -2848,7 +2849,7 @@ sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
 				"Assuming drive cache: write back\n");
 		sdkp->WCE = 1;
 	} else {
-		sd_first_printk(KERN_ERR, sdkp,
+		sd_first_printk(KERN_WARNING, sdkp,
 				"Assuming drive cache: write through\n");
 		sdkp->WCE = 0;
 	}
-- 
2.30.2