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authorJames Bottomley <James.Bottomley@SteelEye.com>2007-12-02 19:10:40 +0200
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-11 18:22:50 -0600
commit001aac257cf8adbe90cdcba6e07f8d12dfc8fa6b (patch)
tree0eb6294049245e05f47fdb76e3f878c78c015d88 /drivers/scsi/scsi_lib.c
parent4a03d90e35bc5273d27301fa669d4b2103196f94 (diff)
downloadop-kernel-dev-001aac257cf8adbe90cdcba6e07f8d12dfc8fa6b.zip
op-kernel-dev-001aac257cf8adbe90cdcba6e07f8d12dfc8fa6b.tar.gz
[SCSI] sd,sr: add early detection of medium not present
The current scsi_test_unit_ready() is updated to return sense code information (in struct scsi_sense_hdr). The sd and sr drivers are changed to interpret the sense code return asc 0x3a as no media and adjust the device status accordingly. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c46
1 files changed, 38 insertions, 8 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index aa17e71..db522228 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1973,27 +1973,57 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
}
EXPORT_SYMBOL(scsi_mode_sense);
+/**
+ * scsi_test_unit_ready - test if unit is ready
+ * @sdev: scsi device to change the state of.
+ * @timeout: command timeout
+ * @retries: number of retries before failing
+ * @sshdr_external: Optional pointer to struct scsi_sense_hdr for
+ * returning sense. Make sure that this is cleared before passing
+ * in.
+ *
+ * Returns zero if unsuccessful or an error if TUR failed. For
+ * removable media, a return of NOT_READY or UNIT_ATTENTION is
+ * translated to success, with the ->changed flag updated.
+ **/
int
-scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries)
+scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries,
+ struct scsi_sense_hdr *sshdr_external)
{
char cmd[] = {
TEST_UNIT_READY, 0, 0, 0, 0, 0,
};
- struct scsi_sense_hdr sshdr;
+ struct scsi_sense_hdr *sshdr;
int result;
-
- result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0, &sshdr,
- timeout, retries);
+
+ if (!sshdr_external)
+ sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
+ else
+ sshdr = sshdr_external;
+
+ /* try to eat the UNIT_ATTENTION if there are enough retries */
+ do {
+ result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0, sshdr,
+ timeout, retries);
+ } while ((driver_byte(result) & DRIVER_SENSE) &&
+ sshdr && sshdr->sense_key == UNIT_ATTENTION &&
+ --retries);
+
+ if (!sshdr)
+ /* could not allocate sense buffer, so can't process it */
+ return result;
if ((driver_byte(result) & DRIVER_SENSE) && sdev->removable) {
- if ((scsi_sense_valid(&sshdr)) &&
- ((sshdr.sense_key == UNIT_ATTENTION) ||
- (sshdr.sense_key == NOT_READY))) {
+ if ((scsi_sense_valid(sshdr)) &&
+ ((sshdr->sense_key == UNIT_ATTENTION) ||
+ (sshdr->sense_key == NOT_READY))) {
sdev->changed = 1;
result = 0;
}
}
+ if (!sshdr_external)
+ kfree(sshdr);
return result;
}
EXPORT_SYMBOL(scsi_test_unit_ready);
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