diff options
| author | Michael Reed <mdr@sgi.com> | 2010-09-20 11:20:22 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-11-22 11:03:15 -0800 |
| commit | 2c690983958ec471cf803467ff5229ff4990078d (patch) | |
| tree | 5d989cf269c4238a1d3e255683438565c1960eca | |
| parent | 85e8a7b93d175d0c6a395aefa1613d3e9c25a882 (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: Greg Kroah-Hartman <gregkh@suse.de>
| -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 ffa0689ee840..0eb0af56db97 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2252,11 +2252,10 @@ 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; @@ -2346,6 +2345,12 @@ 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; |