During device discovery, scsi mid layer sends INQUIRY command to LUN 0. If the LUN 0 is not mapped to host, it creates a temporary scsi_device with LUN id 0 and sends REPORT_LUNS command to it. After the REPORT_LUNS succeeds, it walks through the LUN table and adds each LUN found to sysfs. At the end of REPORT_LUNS lun table scan, it will delete the temporary scsi_device of LUN 0.
When scsi devices are added to sysfs, it calls add_dev function of all the registered class interfaces. If ses driver has been registered, ses_intf_add() of ses module will be called. This function calls scsi_device_enclosure() to check the inquiry data for EncServ bit. Since inquiry was not allocated for temporary LUN 0 scsi_device, it will cause NULL pointer exception.
To fix the problem, sdev->inquiry is checked for NULL before reading it.
Signed-off-by: Somasundaram Krishnasamy <Somasundaram.Krishnasamy@xxxxxxx>
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
--- linux-2.6.38-rc6/include/scsi/scsi_device.h.orig 2011-02-28 16:12:51.000000000 -0600
+++ linux-2.6.38-rc6/include/scsi/scsi_device.h 2011-02-28 16:16:02.000000000 -0600
@@ -461,7 +461,7 @@ static inline int scsi_device_qas(struct
}
static inline int scsi_device_enclosure(struct scsi_device *sdev)
{
- return sdev->inquiry[6] & (1<<6);
+ return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
}
static inline int scsi_device_protection(struct scsi_device *sdev)
--
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