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[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>
This commit is contained in:
Michael Reed 2010-09-20 11:20:22 -05:00 committed by James Bottomley
parent 43ca910a9c
commit 1a03ae0f55
1 changed files with 10 additions and 5 deletions
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9
drivers/scsi/sd.c
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@ -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->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;