[SCSI] convert sd to scsi_execute_req (and update the scsi_execute_req API)

This one removes struct scsi_request entirely from sd.  In the process,
I noticed we have no callers of scsi_wait_req who don't immediately
normalise the sense, so I updated the API to make it take a struct
scsi_sense_hdr instead of simply a big sense buffer.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 64 insertions, 96 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 15c2039059c9..611ccde84778 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -59,7 +59,6 @@
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_ioctl.h>
-#include <scsi/scsi_request.h>
 #include <scsi/scsicam.h>
 
 #include "scsi_logging.h"
@@ -125,7 +124,7 @@ static int sd_issue_flush(struct device *, sector_t *);
 static void sd_end_flush(request_queue_t *, struct request *);
 static int sd_prepare_flush(request_queue_t *, struct request *);
 static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname,
-                 struct scsi_request *SRpnt, unsigned char *buffer);
+                             unsigned char *buffer);
 
 static struct scsi_driver sd_template = {
         .owner                  = THIS_MODULE,
@@ -682,19 +681,13 @@ not_present:
 
 static int sd_sync_cache(struct scsi_device *sdp)
 {
-        struct scsi_request *sreq;
         int retries, res;
+        struct scsi_sense_hdr sshdr;
 
         if (!scsi_device_online(sdp))
                 return -ENODEV;
 
-        sreq = scsi_allocate_request(sdp, GFP_KERNEL);
-        if (!sreq) {
-                printk("FAILED\n  No memory for request\n");
-                return -ENOMEM;
-        }
 
-        sreq->sr_data_direction = DMA_NONE;
         for (retries = 3; retries > 0; --retries) {
                 unsigned char cmd[10] = { 0 };
 
@@ -703,22 +696,20 @@ static int sd_sync_cache(struct scsi_device *sdp)
                  * Leave the rest of the command zero to indicate
                  * flush everything.
                  */
-                scsi_wait_req(sreq, cmd, NULL, 0, SD_TIMEOUT, SD_MAX_RETRIES);
-                if (sreq->sr_result == 0)
+                res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
+                                       SD_TIMEOUT, SD_MAX_RETRIES);
+                if (res == 0)
                         break;
         }
 
-        res = sreq->sr_result;
-        if (res) {
-                printk(KERN_WARNING "FAILED\n  status = %x, message = %02x, "
+        if (res) {              printk(KERN_WARNING "FAILED\n  status = %x, message = %02x, "
                                     "host = %d, driver = %02x\n  ",
                                     status_byte(res), msg_byte(res),
                                     host_byte(res), driver_byte(res));
                         if (driver_byte(res) & DRIVER_SENSE)
-                                scsi_print_req_sense("sd", sreq);
+                                scsi_print_sense_hdr("sd", &sshdr);
         }
 
-        scsi_release_request(sreq);
         return res;
 }
 
@@ -957,22 +948,19 @@ static void sd_rw_intr(struct scsi_cmnd * SCpnt)
         scsi_io_completion(SCpnt, good_bytes, block_sectors << 9);
 }
 
-static int media_not_present(struct scsi_disk *sdkp, struct scsi_request *srp)
+static int media_not_present(struct scsi_disk *sdkp,
+                             struct scsi_sense_hdr *sshdr)
 {
-        struct scsi_sense_hdr sshdr;
 
-        if (!srp->sr_result)
-                return 0;
-        if (!(driver_byte(srp->sr_result) & DRIVER_SENSE))
+        if (!scsi_sense_valid(sshdr))
                 return 0;
         /* not invoked for commands that could return deferred errors */
-        if (scsi_request_normalize_sense(srp, &sshdr)) {
-                if (sshdr.sense_key != NOT_READY &&
-                    sshdr.sense_key != UNIT_ATTENTION)
-                        return 0;
-                if (sshdr.asc != 0x3A) /* medium not present */
-                        return 0;
-        }
+        if (sshdr->sense_key != NOT_READY &&
+            sshdr->sense_key != UNIT_ATTENTION)
+                return 0;
+        if (sshdr->asc != 0x3A) /* medium not present */
+                return 0;
+
         set_media_not_present(sdkp);
         return 1;
 }
@@ -981,8 +969,8 @@ static int media_not_present(struct scsi_disk *sdkp, struct scsi_request *srp)
  * spinup disk - called only in sd_revalidate_disk()
  */
 static void
-sd_spinup_disk(struct scsi_disk *sdkp, char *diskname,
-               struct scsi_request *SRpnt, unsigned char *buffer) {
+sd_spinup_disk(struct scsi_disk *sdkp, char *diskname)
+{
         unsigned char cmd[10];
         unsigned long spintime_value = 0;
         int retries, spintime;
@@ -1001,18 +989,13 @@ sd_spinup_disk(struct scsi_disk *sdkp, char *diskname,
                         cmd[0] = TEST_UNIT_READY;
                         memset((void *) &cmd[1], 0, 9);
 
-                        SRpnt->sr_cmd_len = 0;
-                        memset(SRpnt->sr_sense_buffer, 0,
-                               SCSI_SENSE_BUFFERSIZE);
-                        SRpnt->sr_data_direction = DMA_NONE;
+                        the_result = scsi_execute_req(sdkp->device, cmd,
+                                                      DMA_NONE, NULL, 0,
+                                                      &sshdr, SD_TIMEOUT,
+                                                      SD_MAX_RETRIES);
 
-                        scsi_wait_req (SRpnt, (void *) cmd, (void *) buffer,
-                                       0/*512*/, SD_TIMEOUT, SD_MAX_RETRIES);
-
-                        the_result = SRpnt->sr_result;
                         if (the_result)
-                                sense_valid = scsi_request_normalize_sense(
-                                                        SRpnt, &sshdr);
+                                sense_valid = scsi_sense_valid(&sshdr);
                         retries++;
                 } while (retries < 3 && 
                          (!scsi_status_is_good(the_result) ||
@@ -1024,7 +1007,7 @@ sd_spinup_disk(struct scsi_disk *sdkp, char *diskname,
                  * any media in it, don't bother with any of the rest of
                  * this crap.
                  */
-                if (media_not_present(sdkp, SRpnt))
+                if (media_not_present(sdkp, &sshdr))
                         return;
 
                 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
@@ -1063,14 +1046,9 @@ sd_spinup_disk(struct scsi_disk *sdkp, char *diskname,
                                 cmd[1] = 1;     /* Return immediately */
                                 memset((void *) &cmd[2], 0, 8);
                                 cmd[4] = 1;     /* Start spin cycle */
-                                SRpnt->sr_cmd_len = 0;
-                                memset(SRpnt->sr_sense_buffer, 0,
-                                        SCSI_SENSE_BUFFERSIZE);
-
-                                SRpnt->sr_data_direction = DMA_NONE;
-                                scsi_wait_req(SRpnt, (void *)cmd, 
-                                              (void *) buffer, 0/*512*/, 
-                                              SD_TIMEOUT, SD_MAX_RETRIES);
+                                scsi_execute_req(sdkp->device, cmd, DMA_NONE,
+                                                 NULL, 0, &sshdr,
+                                                 SD_TIMEOUT, SD_MAX_RETRIES);
                                 spintime_value = jiffies;
                         }
                         spintime = 1;
@@ -1083,7 +1061,7 @@ sd_spinup_disk(struct scsi_disk *sdkp, char *diskname,
                         if(!spintime) {
                                 printk(KERN_NOTICE "%s: Unit Not Ready, "
                                         "sense:\n", diskname);
-                                scsi_print_req_sense("", SRpnt);
+                                scsi_print_sense_hdr("", &sshdr);
                         }
                         break;
                 }
@@ -1104,14 +1082,15 @@ sd_spinup_disk(struct scsi_disk *sdkp, char *diskname,
  */
 static void
 sd_read_capacity(struct scsi_disk *sdkp, char *diskname,
-                 struct scsi_request *SRpnt, unsigned char *buffer) {
+                 unsigned char *buffer)
+{
         unsigned char cmd[16];
-        struct scsi_device *sdp = sdkp->device;
         int the_result, retries;
         int sector_size = 0;
         int longrc = 0;
         struct scsi_sense_hdr sshdr;
         int sense_valid = 0;
+        struct scsi_device *sdp = sdkp->device;
 
 repeat:
         retries = 3;
@@ -1128,20 +1107,15 @@ repeat:
                         memset((void *) buffer, 0, 8);
                 }
                 
-                SRpnt->sr_cmd_len = 0;
-                memset(SRpnt->sr_sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
-                SRpnt->sr_data_direction = DMA_FROM_DEVICE;
-
-                scsi_wait_req(SRpnt, (void *) cmd, (void *) buffer,
-                              longrc ? 12 : 8, SD_TIMEOUT, SD_MAX_RETRIES);
+                the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
+                                              buffer, longrc ? 12 : 8, &sshdr,
+                                              SD_TIMEOUT, SD_MAX_RETRIES);
 
-                if (media_not_present(sdkp, SRpnt))
+                if (media_not_present(sdkp, &sshdr))
                         return;
 
-                the_result = SRpnt->sr_result;
                 if (the_result)
-                        sense_valid = scsi_request_normalize_sense(SRpnt,
-                                                                   &sshdr);
+                        sense_valid = scsi_sense_valid(&sshdr);
                 retries--;
 
         } while (the_result && retries);
@@ -1156,7 +1130,7 @@ repeat:
                        driver_byte(the_result));
 
                 if (driver_byte(the_result) & DRIVER_SENSE)
-                        scsi_print_req_sense("sd", SRpnt);
+                        scsi_print_sense_hdr("sd", &sshdr);
                 else
                         printk("%s : sense not available. \n", diskname);
 
@@ -1296,12 +1270,13 @@ got_data:
 
 /* called with buffer of length 512 */
 static inline int
-sd_do_mode_sense(struct scsi_request *SRpnt, int dbd, int modepage,
-                 unsigned char *buffer, int len, struct scsi_mode_data *data)
+sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
+                 unsigned char *buffer, int len, struct scsi_mode_data *data,
+                 struct scsi_sense_hdr *sshdr)
 {
-        return scsi_mode_sense(SRpnt->sr_device, dbd, modepage, buffer, len,
+        return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
                                SD_TIMEOUT, SD_MAX_RETRIES, data,
-                               SRpnt->sr_sense_buffer);
+                               sshdr);
 }
 
 /*
@@ -1310,25 +1285,27 @@ sd_do_mode_sense(struct scsi_request *SRpnt, int dbd, int modepage,
  */
 static void
 sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
-                   struct scsi_request *SRpnt, unsigned char *buffer) {
+                           unsigned char *buffer)
+{
         int res;
+        struct scsi_device *sdp = sdkp->device;
         struct scsi_mode_data data;
 
         set_disk_ro(sdkp->disk, 0);
-        if (sdkp->device->skip_ms_page_3f) {
+        if (sdp->skip_ms_page_3f) {
                 printk(KERN_NOTICE "%s: assuming Write Enabled\n", diskname);
                 return;
         }
 
-        if (sdkp->device->use_192_bytes_for_3f) {
-                res = sd_do_mode_sense(SRpnt, 0, 0x3F, buffer, 192, &data);
+        if (sdp->use_192_bytes_for_3f) {
+                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
         } else {
                 /*
                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
                  * We have to start carefully: some devices hang if we ask
                  * for more than is available.
                  */
-                res = sd_do_mode_sense(SRpnt, 0, 0x3F, buffer, 4, &data);
+                res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
 
                 /*
                  * Second attempt: ask for page 0 When only page 0 is
@@ -1337,14 +1314,14 @@ sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
                  * CDB.
                  */
                 if (!scsi_status_is_good(res))
-                        res = sd_do_mode_sense(SRpnt, 0, 0, buffer, 4, &data);
+                        res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
 
                 /*
                  * Third attempt: ask 255 bytes, as we did earlier.
                  */
                 if (!scsi_status_is_good(res))
-                        res = sd_do_mode_sense(SRpnt, 0, 0x3F, buffer, 255,
-                                               &data);
+                        res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
+                                               &data, NULL);
         }
 
         if (!scsi_status_is_good(res)) {
@@ -1366,19 +1343,20 @@ sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
  */
 static void
 sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
-                   struct scsi_request *SRpnt, unsigned char *buffer)
+                   unsigned char *buffer)
 {
         int len = 0, res;
+        struct scsi_device *sdp = sdkp->device;
 
         int dbd;
         int modepage;
         struct scsi_mode_data data;
         struct scsi_sense_hdr sshdr;
 
-        if (sdkp->device->skip_ms_page_8)
+        if (sdp->skip_ms_page_8)
                 goto defaults;
 
-        if (sdkp->device->type == TYPE_RBC) {
+        if (sdp->type == TYPE_RBC) {
                 modepage = 6;
                 dbd = 8;
         } else {
@@ -1387,7 +1365,7 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
         }
 
         /* cautiously ask */
-        res = sd_do_mode_sense(SRpnt, dbd, modepage, buffer, 4, &data);
+        res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
 
         if (!scsi_status_is_good(res))
                 goto bad_sense;
@@ -1408,7 +1386,7 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
         len += data.header_length + data.block_descriptor_length;
 
         /* Get the data */
-        res = sd_do_mode_sense(SRpnt, dbd, modepage, buffer, len, &data);
+        res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
 
         if (scsi_status_is_good(res)) {
                 const char *types[] = {
@@ -1440,7 +1418,7 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
         }
 
 bad_sense:
-        if (scsi_request_normalize_sense(SRpnt, &sshdr) &&
+        if (scsi_sense_valid(&sshdr) &&
             sshdr.sense_key == ILLEGAL_REQUEST &&
             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
                 printk(KERN_NOTICE "%s: cache data unavailable\n",
@@ -1465,7 +1443,6 @@ static int sd_revalidate_disk(struct gendisk *disk)
 {
         struct scsi_disk *sdkp = scsi_disk(disk);
         struct scsi_device *sdp = sdkp->device;
-        struct scsi_request *sreq;
         unsigned char *buffer;
 
         SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name));
@@ -1477,18 +1454,11 @@ static int sd_revalidate_disk(struct gendisk *disk)
         if (!scsi_device_online(sdp))
                 goto out;
 
-        sreq = scsi_allocate_request(sdp, GFP_KERNEL);
-        if (!sreq) {
-                printk(KERN_WARNING "(sd_revalidate_disk:) Request allocation "
-                       "failure.\n");
-                goto out;
-        }
-
         buffer = kmalloc(512, GFP_KERNEL | __GFP_DMA);
         if (!buffer) {
                 printk(KERN_WARNING "(sd_revalidate_disk:) Memory allocation "
                        "failure.\n");
-                goto out_release_request;
+                goto out;
         }
 
         /* defaults, until the device tells us otherwise */
@@ -1499,25 +1469,23 @@ static int sd_revalidate_disk(struct gendisk *disk)
         sdkp->WCE = 0;
         sdkp->RCD = 0;
 
-        sd_spinup_disk(sdkp, disk->disk_name, sreq, buffer);
+        sd_spinup_disk(sdkp, disk->disk_name);
 
         /*
          * Without media there is no reason to ask; moreover, some devices
          * react badly if we do.
          */
         if (sdkp->media_present) {
-                sd_read_capacity(sdkp, disk->disk_name, sreq, buffer);
+                sd_read_capacity(sdkp, disk->disk_name, buffer);
                 if (sdp->removable)
                         sd_read_write_protect_flag(sdkp, disk->disk_name,
-                                        sreq, buffer);
-                sd_read_cache_type(sdkp, disk->disk_name, sreq, buffer);
+                                                   buffer);
+                sd_read_cache_type(sdkp, disk->disk_name, buffer);
         }
                 
         set_capacity(disk, sdkp->capacity);
         kfree(buffer);
 
- out_release_request: 
-        scsi_release_request(sreq);
  out:
         return 0;
 }