diff options
| author | Michael Reed <mdr@sgi.com> | 2010-09-20 11:20:22 -0500 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2011-01-06 18:08:26 -0500 |
| commit | 40f6bfc766b4a53c8018da34b18c772cbbeffce5 (patch) | |
| tree | d78de884c17f678a098e58bacb27a1c28cdb1b49 | |
| parent | 441830e3f24e6b6ff883c87f82b90fecb63ca12f (diff) | |
sd name space exhaustion causes system hang
commit 1a03ae0f556a931aa3747b70e44b78308f5b0590 upstream.
Following a site power outage which re-enabled all the ports on my FC
switches, my system subsequently booted with far too many luns! I had
let it run hoping it would make multi-user. It didn't. :( It hung solid
after exhausting the last sd device, sdzzz, and attempting to create sdaaaa
and beyond. I was unable to get a dump.
Discovered using a 2.6.32.13 based system.
correct this by detecting when the last index is utilized and failing
the sd probe of the device. Patch applies to scsi-misc-2.6.
Signed-off-by: Michael Reed <mdr@sgi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
| -rw-r--r-- | drivers/scsi/sd.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index de6c60320f6..892f4466809 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2163,11 +2163,10 @@ static void sd_probe_async(void *data, async_cookie_t cookie) index = sdkp->index; dev = &sdp->sdev_gendev; - if (index < SD_MAX_DISKS) { - gd->major = sd_major((index & 0xf0) >> 4); - gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); - gd->minors = SD_MINORS; - } + gd->major = sd_major((index & 0xf0) >> 4); + gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); + gd->minors = SD_MINORS; + gd->fops = &sd_fops; gd->private_data = &sdkp->driver; gd->queue = sdkp->device->request_queue; @@ -2256,6 +2255,12 @@ static int sd_probe(struct device *dev) if (error) goto out_put; + if (index >= SD_MAX_DISKS) { + error = -ENODEV; + sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n"); + goto out_free_index; + } + error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); if (error) goto out_free_index; |