[PATCH 20/21] uas: Remove support for old sense ui as used in pre-production hardware

Hans de Goede
2014-09-10T11:46:50Z

I've access to a number of different uas devices now, and none of them use
old style sense urbs. The only case where these code-paths trigger is with
the asm1051 and there they do the wrong thing, as the asm1051 sends 8 bytes
status iu-s when it does not have any sense data, but uses new style
sense iu-s regardless, as can be seen for scsi cmnds where there is sense
data.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
drivers/usb/storage/uas.c | 47 +----------------------------------------------
1 file changed, 1 insertion(+), 46 deletions(-)

diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index e8d2bf1..23c0b97 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -31,20 +31,6 @@

#define MAX_CMNDS 256

-/*
- * The r00-r01c specs define this version of the SENSE IU data structure.
- * It's still in use by several different firmware releases.
- */
-struct sense_iu_old {
- __u8 iu_id;
- __u8 rsvd1;
- __be16 tag;
- __be16 len;
- __u8 status;
- __u8 service_response;
- __u8 sense[SCSI_SENSE_BUFFERSIZE];
-};
-
struct uas_dev_info {
struct usb_interface *intf;
struct usb_device *udev;
@@ -54,7 +40,6 @@ struct uas_dev_info {
int qdepth, resetting;
unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
unsigned use_streams:1;
- unsigned uas_sense_old:1;
unsigned shutdown:1;
struct scsi_cmnd *cmnd[MAX_CMNDS];
spinlock_t lock;
@@ -184,29 +169,6 @@ static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
cmnd->result = sense_iu->status;
}

-static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
-{
- struct sense_iu_old *sense_iu = urb->transfer_buffer;
- struct scsi_device *sdev = cmnd->device;
-
- if (urb->actual_length > 8) {
- unsigned len = be16_to_cpup(&sense_iu->len) - 2;
- if (len + 8 != urb->actual_length) {
- int newlen = min(len + 8, urb->actual_length) - 8;
- if (newlen < 0)
- newlen = 0;
- sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
- "disagrees with IU sense data length %d, "
- "using %d bytes of sense data\n", __func__,
- urb->actual_length, len, newlen);
- len = newlen;
- }
- memcpy(cmnd->sense_buffer, sense_iu->sense, len);
- }
-
- cmnd->result = sense_iu->status;
-}
-
/*
* scsi-tags go from 0 - (nr_tags - 1), uas tags need to match stream-ids,
* which go from 1 - nr_streams. And we use 1 for untagged commands.
@@ -336,12 +298,7 @@ static void uas_stat_cmplt(struct urb *urb)

switch (iu->iu_id) {
case IU_ID_STATUS:
- if (urb->actual_length < 16)
- devinfo->uas_sense_old = 1;
- if (devinfo->uas_sense_old)
- uas_sense_old(urb, cmnd);
- else
- uas_sense(urb, cmnd);
+ uas_sense(urb, cmnd);
if (cmnd->result != 0) {
/* cancel data transfers on error */
data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
@@ -888,8 +845,6 @@ static int uas_configure_endpoints(struct uas_dev_info *devinfo)
struct usb_device *udev = devinfo->udev;
int r;

- devinfo->uas_sense_old = 0;