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authorJames Bottomley <James.Bottomley@HansenPartnership.com>2008-02-06 22:01:58 +0300
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-02-08 03:02:44 +0300
commit38582a62ecd337de4212004c7d4844899dc57890 (patch)
tree44a331ae517ad2307583e3aa3774445c39dc91a8 /drivers/scsi/sr.c
parentd6a451dd4d7ec805f9a21bb1994ce8ceaecc8fe6 (diff)
downloadlinux-38582a62ecd337de4212004c7d4844899dc57890.tar.xz
[SCSI] sr: fix test unit ready responses
Commit 210ba1d1724f5c4ed87a2ab1a21ca861a915f734 updated sr.c to use the scsi_test_unit_ready() function. Unfortunately, this has the wrong characteristic of eating NOT_READY returns which sr.c relies on for tray status. Fix by rolling an internal sr_test_unit_ready() that doesn't do this. Tested-by: Daniel Drake <dsd@gentoo.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/sr.c')
-rw-r--r--drivers/scsi/sr.c49
1 files changed, 27 insertions, 22 deletions
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 50ba49250203..208565bdbe8e 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -163,6 +163,29 @@ static void scsi_cd_put(struct scsi_cd *cd)
mutex_unlock(&sr_ref_mutex);
}
+/* identical to scsi_test_unit_ready except that it doesn't
+ * eat the NOT_READY returns for removable media */
+int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr)
+{
+ int retries = MAX_RETRIES;
+ int the_result;
+ u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 };
+
+ /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
+ * conditions are gone, or a timeout happens
+ */
+ do {
+ the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL,
+ 0, sshdr, SR_TIMEOUT,
+ retries--);
+
+ } while (retries > 0 &&
+ (!scsi_status_is_good(the_result) ||
+ (scsi_sense_valid(sshdr) &&
+ sshdr->sense_key == UNIT_ATTENTION)));
+ return the_result;
+}
+
/*
* This function checks to see if the media has been changed in the
* CDROM drive. It is possible that we have already sensed a change,
@@ -185,8 +208,7 @@ static int sr_media_change(struct cdrom_device_info *cdi, int slot)
}
sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
- retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES,
- sshdr);
+ retval = sr_test_unit_ready(cd->device, sshdr);
if (retval || (scsi_sense_valid(sshdr) &&
/* 0x3a is medium not present */
sshdr->asc == 0x3a)) {
@@ -733,10 +755,8 @@ static void get_capabilities(struct scsi_cd *cd)
{
unsigned char *buffer;
struct scsi_mode_data data;
- unsigned char cmd[MAX_COMMAND_SIZE];
struct scsi_sense_hdr sshdr;
- unsigned int the_result;
- int retries, rc, n;
+ int rc, n;
static const char *loadmech[] =
{
@@ -758,23 +778,8 @@ static void get_capabilities(struct scsi_cd *cd)
return;
}
- /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
- * conditions are gone, or a timeout happens
- */
- retries = 0;
- do {
- memset((void *)cmd, 0, MAX_COMMAND_SIZE);
- cmd[0] = TEST_UNIT_READY;
-
- the_result = scsi_execute_req (cd->device, cmd, DMA_NONE, NULL,
- 0, &sshdr, SR_TIMEOUT,
- MAX_RETRIES);
-
- retries++;
- } while (retries < 5 &&
- (!scsi_status_is_good(the_result) ||
- (scsi_sense_valid(&sshdr) &&
- sshdr.sense_key == UNIT_ATTENTION)));
+ /* eat unit attentions */
+ sr_test_unit_ready(cd->device, &sshdr);
/* ask for mode page 0x2a */
rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,