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| author | Michael Reed <mdr@sgi.com> | 2010-09-20 11:20:22 -0500 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2010-10-07 17:16:28 -0500 |
| commit | 1a03ae0f556a931aa3747b70e44b78308f5b0590 (patch) | |
| tree | b31139e3dcffb4a890f40e1b7b875569dcec80ce /drivers/scsi/sd.c | |
| parent | 43ca910a9c90566308f39f51ac03a55f94a5f83c (diff) | |
| download | linux-1a03ae0f556a931aa3747b70e44b78308f5b0590.tar.gz linux-1a03ae0f556a931aa3747b70e44b78308f5b0590.tar.bz2 linux-1a03ae0f556a931aa3747b70e44b78308f5b0590.zip | |
[SCSI] sd name space exhaustion causes system hang
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>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/sd.c')
| -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 0c4f89cfb7dc..50f1fe605303 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2288,11 +2288,10 @@ 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; @@ -2382,6 +2381,12 @@ 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; |