On Fri, 14 Dec 2007, Dave Young wrote: > Hi, > The behaviour of my mp3 player (also act as usb-storage device) seems > changed from rc5 to rc5-mm1.
This can't be considered a bug, right? It's just that the player changed from one slightly non-standard behavior to a different slightly non-standard behavior. > <dmesg output under rc5>: > ========= > usb 1-7: new high speed USB device using ehci_hcd and address 7 > usb 1-7: configuration #1 chosen from 1 choice > scsi4 : SCSI emulation for USB Mass Storage devices > usb-storage: device found at 7 > usb-storage: waiting for device to settle before scanning > scsi 4:0:0:0: Direct-Access Newman mp3 PQ: 0 ANSI: 0 > CCS > sd 4:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB) > sd 4:0:0:0: [sdb] Write Protect is on > sd 4:0:0:0: [sdb] Mode Sense: 03 00 80 00 > sd 4:0:0:0: [sdb] Assuming drive cache: write through > sd 4:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB) > sd 4:0:0:0: [sdb] Write Protect is on > sd 4:0:0:0: [sdb] Mode Sense: 03 00 80 00 > sd 4:0:0:0: [sdb] Assuming drive cache: write through > sdb: sdb1 > sd 4:0:0:0: [sdb] Attached SCSI removable disk > sd 4:0:0:0: Attached scsi generic sg1 type 0 > usb-storage: device scan complete > > ========== > try mount it (or just blockdev --rereadpt), then write protect become off: > ========== > > sd 4:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB) > sd 4:0:0:0: [sdb] Write Protect is off > sd 4:0:0:0: [sdb] Mode Sense: 03 00 00 00 > sd 4:0:0:0: [sdb] Assuming drive cache: write through > sd 4:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB) > sd 4:0:0:0: [sdb] Write Protect is off > sd 4:0:0:0: [sdb] Mode Sense: 03 00 00 00 > sd 4:0:0:0: [sdb] Assuming drive cache: write through > sdb: sdb1 This output won't appear if you simply mount the device. So how do you know that mounting turns off write protect? > But under rc5-mm1, after mount command being executed, it is just > mouted as read only partition without set the write-protect to off > > I tried "blockdev --rereadpt", it do set the write-protect to off as rc5 > kernel. > > Below is the output of dmesg under rc5-mm1 > ========== > usb 1-8: new high speed USB device using ehci_hcd and address 6 > usb 1-8: configuration #1 chosen from 1 choice > scsi3 : SCSI emulation for USB Mass Storage devices > usb-storage: device found at 6 > usb-storage: waiting for device to settle before scanning > scsi 3:0:0:0: Direct-Access Newman mp3 PQ: 0 ANSI: 0 > CCS > sd 3:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB) > sd 3:0:0:0: [sdb] Write Protect is on > sd 3:0:0:0: [sdb] Mode Sense: 03 00 80 00 > sd 3:0:0:0: [sdb] Assuming drive cache: write through > sd 3:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB) > sd 3:0:0:0: [sdb] Write Protect is on > sd 3:0:0:0: [sdb] Mode Sense: 03 00 80 00 > sd 3:0:0:0: [sdb] Assuming drive cache: write through > sdb: sdb1 This looks exactly the same as the output above (except for various port, device, and bus numbers). If you turn on CONFIG_USB_STORAGE_DEBUG for both kernels and compare the dmesg output for the mount command, that might highlight the difference. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/