| User: | Jiri Slaby |
| Error type: | Invalid Pointer Dereference |
| Error type description: | A pointer which is invalid is being dereferenced |
| File location: | drivers/scsi/sr.c |
| Line in file: | 188 |
| Project: | Linux Kernel |
| Project version: | 2.6.28 |
| Tools: |
Stanse
(1.2)
|
| Entered: | 2011-11-07 22:22:22 UTC |
158 struct scsi_device *sdev = cd->device; 159 160 mutex_lock(&sr_ref_mutex); 161 kref_put(&cd->kref, sr_kref_release); 162 scsi_device_put(sdev); 163 mutex_unlock(&sr_ref_mutex); 164} 165 166/* identical to scsi_test_unit_ready except that it doesn't 167 * eat the NOT_READY returns for removable media */ 168int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) 169{ 170 int retries = MAX_RETRIES; 171 int the_result; 172 u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 }; 173 174 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 175 * conditions are gone, or a timeout happens 176 */ 177 do { 178 the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 179 0, sshdr, SR_TIMEOUT, 180 retries--); 181 if (scsi_sense_valid(sshdr) && 182 sshdr->sense_key == UNIT_ATTENTION) 183 sdev->changed = 1; 184 185 } while (retries > 0 && 186 (!scsi_status_is_good(the_result) || 187 (scsi_sense_valid(sshdr) && 188 sshdr->sense_key == UNIT_ATTENTION))); 189 return the_result; 190} 191 192/* 193 * This function checks to see if the media has been changed in the 194 * CDROM drive. It is possible that we have already sensed a change, 195 * or the drive may have sensed one and not yet reported it. We must 196 * be ready for either case. This function always reports the current 197 * value of the changed bit. If flag is 0, then the changed bit is reset. 198 * This function could be done as an ioctl, but we would need to have