On Mon, 11 May 2009, Andrew Morton wrote: > > http://bugzilla.kernel.org/show_bug.cgi?id=13273 > > > > Summary: Error by disconnecting USB flash storage in 2.6.30-rc5 > > x86-64 > > [36225.730491] Call Trace: > > [36225.730494] [<ffffffff8113afdb>] register_disk+0xcb/0x140 > > [36225.730501] [<ffffffff81208f77>] add_disk+0x87/0x160 > > [36225.730508] [<ffffffffa002ad06>] sd_probe_async+0x1a6/0x290 [sd_mod] Like I said earlier, this is a problem in the SCSI stack. In particular, sd_probe_sync() fails to acquire the host's scan_mutex or to test scsi_host_scan_allowed(). Evidently Arjan's conversion to the async framework did not preserve the software environment as it should have. Let us know if this patch helps. Alan Stern Index: usb-2.6/drivers/scsi/sd.c =================================================================== --- usb-2.6.orig/drivers/scsi/sd.c +++ usb-2.6/drivers/scsi/sd.c @@ -1892,12 +1892,16 @@ static int sd_format_disk_name(char *pre static void sd_probe_async(void *data, async_cookie_t cookie) { struct scsi_disk *sdkp = data; - struct scsi_device *sdp; + struct scsi_device *sdp = sdkp->device; + struct Scsi_Host *shost = sdp->host; struct gendisk *gd; u32 index; struct device *dev; - sdp = sdkp->device; + mutex_lock(&shost->scan_mutex); + if (!scsi_host_scan_allowed(shost)) + goto out_unlock_host; + gd = sdkp->disk; index = sdkp->index; dev = &sdp->sdev_gendev; @@ -1915,8 +1919,10 @@ static void sd_probe_async(void *data, a sdkp->dev.class = &sd_disk_class; dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); - if (device_add(&sdkp->dev)) - goto out_free_index; + if (device_add(&sdkp->dev)) { + ida_remove(&sd_index_ida, index); + goto out_unlock_host; + } get_device(&sdp->sdev_gendev); @@ -1955,10 +1961,8 @@ static void sd_probe_async(void *data, a sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", sdp->removable ? "removable " : ""); - return; - - out_free_index: - ida_remove(&sd_index_ida, index); + out_unlock_host: + mutex_unlock(&shost->scan_mutex); } /** -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
