[SOLVED] [sdc] Asking for cache data failed

piratesmack · 03-23-2011, 06:43 PM

After compiling my own kernel (2.6.38.1), I'm seeing these error messages in dmesg after plugging in a USB flash drive

Code:

[ 1057.530146] usb 1-1: new high speed USB device using ehci_hcd and address 6
[ 1057.648891] scsi4 : usb-storage 1-1:1.0
[ 1058.651335] scsi 4:0:0:0: Direct-Access     SanDisk  U3 Cruzer Micro  8.01 PQ: 0 ANSI: 0 CCS
[ 1058.656676] sd 4:0:0:0: [sdc] 7892991 512-byte logical blocks: (4.04 GB/3.76 GiB)
[ 1058.657531] sd 4:0:0:0: [sdc] Write Protect is off
[ 1058.657555] sd 4:0:0:0: [sdc] Mode Sense: 45 00 00 08
[ 1058.659091] sd 4:0:0:0: [sdc] Asking for cache data failed
[ 1058.659111] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[ 1058.667817] sd 4:0:0:0: Attached scsi generic sg2 type 0
[ 1058.673461] sd 4:0:0:0: [sdc] Asking for cache data failed
[ 1058.673472] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[ 1058.674585]  sdc: sdc1
[ 1058.677631] sd 4:0:0:0: [sdc] Asking for cache data failed
[ 1058.677642] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[ 1058.677652] sd 4:0:0:0: [sdc] Attached SCSI removable disk

The USB drive seems to work just fine, so I'm not sure if the error is serious, but I know I did not see this error with my distributions stock kernel (Slackware current, 2.6.37.4-smp).

I'm guessing it's a problem with my kernel .config. Any idea of what I might have missed?

More info:
My kernel config
Output of 'lspci'
Output of 'lsusb'

Thanks

onebuck · 03-24-2011, 02:33 PM

Moved: This thread is more suitable in <Slackware> and has been moved accordingly to help your thread/question get the exposure it deserves.

Darth Vader · 03-24-2011, 02:44 PM

Quote:

Originally Posted by piratesmack

After compiling my own kernel (2.6.38.1), I'm seeing these error messages in dmesg after plugging in a USB flash drive

Code:

[ 1057.530146] usb 1-1: new high speed USB device using ehci_hcd and address 6
[ 1057.648891] scsi4 : usb-storage 1-1:1.0
[ 1058.651335] scsi 4:0:0:0: Direct-Access     SanDisk  U3 Cruzer Micro  8.01 PQ: 0 ANSI: 0 CCS
[ 1058.656676] sd 4:0:0:0: [sdc] 7892991 512-byte logical blocks: (4.04 GB/3.76 GiB)
[ 1058.657531] sd 4:0:0:0: [sdc] Write Protect is off
[ 1058.657555] sd 4:0:0:0: [sdc] Mode Sense: 45 00 00 08
[ 1058.659091] sd 4:0:0:0: [sdc] Asking for cache data failed
[ 1058.659111] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[ 1058.667817] sd 4:0:0:0: Attached scsi generic sg2 type 0
[ 1058.673461] sd 4:0:0:0: [sdc] Asking for cache data failed
[ 1058.673472] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[ 1058.674585]  sdc: sdc1
[ 1058.677631] sd 4:0:0:0: [sdc] Asking for cache data failed
[ 1058.677642] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[ 1058.677652] sd 4:0:0:0: [sdc] Attached SCSI removable disk

The USB drive seems to work just fine, so I'm not sure if the error is serious, but I know I did not see this error with my distributions stock kernel (Slackware current, 2.6.37.4-smp).

I'm guessing it's a problem with my kernel .config. Any idea of what I might have missed?

More info:
My kernel config
Output of 'lspci'
Output of 'lsusb'

Thanks

Ummmm... It's something benign but complicate to explain. You remember that an harddrive have 2-64MB cache memory? Well, of course, your stick don't have this cache, but appear as a SCSI device. Logically, Mr. Watson?

Someone missed with the debug level for this driver, nothing serious.

piratesmack · 03-24-2011, 03:43 PM

Quote:

Originally Posted by Darth Vader

Ummmm... It's something benign but complicate to explain. You remember that an harddrive have 2-64MB cache memory? Well, of course, your stick don't have this cache, but appear as a SCSI device. Logically, Mr. Watson?

Someone missed with the debug level for this driver, nothing serious.

Aw, that makes sense.
Thanks!