d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add a safety-belt. If the identified disk has 0 blocks, don't attach

Browse Source 
it.  This can happen in some cases when plugging in SD/SmartCard PC
Cards with empty slots.  It is better to detect this bogosity, and
refuse to attach rather than panic with a division by zero (in one of
many places) down stream.
This commit is contained in:
imp 2010-07-04 07:42:52 +00:00
parent e88b37e4b4
commit cdee2d4b3b
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
sys/dev/ata/ata-disk.c
View File

@ -54,7 +54,7 @@ __FBSDID("$FreeBSD$");
/* prototypes */
static void ad_init(device_t dev);
static void ad_get_geometry(device_t dev);
static int ad_get_geometry(device_t dev);
static void ad_set_geometry(device_t dev);
static void ad_done(struct ata_request *request);
static void ad_describe(device_t dev);
@ -106,7 +106,8 @@ ad_attach(device_t dev)
device_set_ivars(dev, adp);
/* get device geometry into internal structs */
ad_get_geometry(dev);
if (ad_get_geometry(dev))
return ENXIO;
/* set the max size if configured */
if (ata_setmax)
@ -410,7 +411,7 @@ ad_init(device_t dev)
atadev->max_iosize = DEV_BSIZE;
}
static void
static int
ad_get_geometry(device_t dev)
{
struct ata_device *atadev = device_get_softc(dev);
@ -432,6 +433,9 @@ ad_get_geometry(device_t dev)
}
lbasize = (u_int32_t)atadev->param.lba_size_1 |
((u_int32_t)atadev->param.lba_size_2 << 16);
/* This device exists, but has no size. Filter out this bogus device. */
if (!lbasize && !adp->total_secs)
return ENXIO;
/* does this device need oldstyle CHS addressing */
if (!ad_version(atadev->param.version_major) || !lbasize)
@ -449,6 +453,7 @@ ad_get_geometry(device_t dev)
if ((atadev->param.support.command2 & ATA_SUPPORT_ADDRESS48) &&
lbasize48 > ATA_MAX_28BIT_LBA)
adp->total_secs = lbasize48;
return 0;
}
static void