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-rw-r--r--drivers/scsi/aha152x.c14
-rw-r--r--drivers/scsi/scsi.c11
-rw-r--r--drivers/scsi/scsi_error.c210
-rw-r--r--drivers/scsi/scsi_lib.c88
-rw-r--r--drivers/scsi/scsi_priv.h1
-rw-r--r--drivers/scsi/sd.c3
-rw-r--r--drivers/scsi/sr.c5
-rw-r--r--include/scsi/scsi_cmnd.h9
8 files changed, 108 insertions, 233 deletions
diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c
index cff3d389b01..f974869ea32 100644
--- a/drivers/scsi/aha152x.c
+++ b/drivers/scsi/aha152x.c
@@ -1179,6 +1179,10 @@ static int aha152x_device_reset(Scsi_Cmnd * SCpnt)
DECLARE_MUTEX_LOCKED(sem);
struct timer_list timer;
int ret, issued, disconnected;
+ unsigned char old_cmd_len = SCpnt->cmd_len;
+ unsigned short old_use_sg = SCpnt->use_sg;
+ void *old_buffer = SCpnt->request_buffer;
+ unsigned old_bufflen = SCpnt->request_bufflen;
unsigned long flags;
#if defined(AHA152X_DEBUG)
@@ -1212,11 +1216,11 @@ static int aha152x_device_reset(Scsi_Cmnd * SCpnt)
add_timer(&timer);
down(&sem);
del_timer(&timer);
-
- SCpnt->cmd_len = SCpnt->old_cmd_len;
- SCpnt->use_sg = SCpnt->old_use_sg;
- SCpnt->request_buffer = SCpnt->buffer;
- SCpnt->request_bufflen = SCpnt->bufflen;
+
+ SCpnt->cmd_len = old_cmd_len;
+ SCpnt->use_sg = old_use_sg;
+ SCpnt->request_buffer = old_buffer;
+ SCpnt->request_bufflen = old_bufflen;
DO_LOCK(flags);
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 2ab7df0dcfe..b332caddd5b 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -346,7 +346,7 @@ void scsi_log_send(struct scsi_cmnd *cmd)
if (level > 3) {
printk(KERN_INFO "buffer = 0x%p, bufflen = %d,"
" done = 0x%p, queuecommand 0x%p\n",
- cmd->buffer, cmd->bufflen,
+ cmd->request_buffer, cmd->request_bufflen,
cmd->done,
sdev->host->hostt->queuecommand);
@@ -661,11 +661,6 @@ void __scsi_done(struct scsi_cmnd *cmd)
*/
int scsi_retry_command(struct scsi_cmnd *cmd)
{
- /*
- * Restore the SCSI command state.
- */
- scsi_setup_cmd_retry(cmd);
-
/*
* Zero the sense information from the last time we tried
* this command.
@@ -711,10 +706,6 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
"Notifying upper driver of completion "
"(result %x)\n", cmd->result));
- /*
- * We can get here with use_sg=0, causing a panic in the upper level
- */
- cmd->use_sg = cmd->old_use_sg;
cmd->done(cmd);
}
EXPORT_SYMBOL(scsi_finish_command);
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 6683d596234..6a5b731bd5b 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -460,19 +460,67 @@ static void scsi_eh_done(struct scsi_cmnd *scmd)
* Return value:
* SUCCESS or FAILED or NEEDS_RETRY
**/
-static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, int timeout)
+static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, int timeout, int copy_sense)
{
struct scsi_device *sdev = scmd->device;
struct Scsi_Host *shost = sdev->host;
+ int old_result = scmd->result;
DECLARE_COMPLETION(done);
unsigned long timeleft;
unsigned long flags;
+ unsigned char old_cmnd[MAX_COMMAND_SIZE];
+ enum dma_data_direction old_data_direction;
+ unsigned short old_use_sg;
+ unsigned char old_cmd_len;
+ unsigned old_bufflen;
+ void *old_buffer;
int rtn;
+ /*
+ * We need saved copies of a number of fields - this is because
+ * error handling may need to overwrite these with different values
+ * to run different commands, and once error handling is complete,
+ * we will need to restore these values prior to running the actual
+ * command.
+ */
+ old_buffer = scmd->request_buffer;
+ old_bufflen = scmd->request_bufflen;
+ memcpy(old_cmnd, scmd->cmnd, sizeof(scmd->cmnd));
+ old_data_direction = scmd->sc_data_direction;
+ old_cmd_len = scmd->cmd_len;
+ old_use_sg = scmd->use_sg;
+
+ if (copy_sense) {
+ int gfp_mask = GFP_ATOMIC;
+
+ if (shost->hostt->unchecked_isa_dma)
+ gfp_mask |= __GFP_DMA;
+
+ scmd->sc_data_direction = DMA_FROM_DEVICE;
+ scmd->request_bufflen = 252;
+ scmd->request_buffer = kzalloc(scmd->request_bufflen, gfp_mask);
+ if (!scmd->request_buffer)
+ return FAILED;
+ } else {
+ scmd->request_buffer = NULL;
+ scmd->request_bufflen = 0;
+ scmd->sc_data_direction = DMA_NONE;
+ }
+
+ scmd->underflow = 0;
+ scmd->use_sg = 0;
+ scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
+
if (sdev->scsi_level <= SCSI_2)
scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |
(sdev->lun << 5 & 0xe0);
+ /*
+ * Zero the sense buffer. The scsi spec mandates that any
+ * untransferred sense data should be interpreted as being zero.
+ */
+ memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
+
shost->eh_action = &done;
spin_lock_irqsave(shost->host_lock, flags);
@@ -522,6 +570,29 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, int timeout)
rtn = FAILED;
}
+
+ /*
+ * Last chance to have valid sense data.
+ */
+ if (copy_sense) {
+ if (!SCSI_SENSE_VALID(scmd)) {
+ memcpy(scmd->sense_buffer, scmd->request_buffer,
+ sizeof(scmd->sense_buffer));
+ }
+ kfree(scmd->request_buffer);
+ }
+
+
+ /*
+ * Restore original data
+ */
+ scmd->request_buffer = old_buffer;
+ scmd->request_bufflen = old_bufflen;
+ memcpy(scmd->cmnd, old_cmnd, sizeof(scmd->cmnd));
+ scmd->sc_data_direction = old_data_direction;
+ scmd->cmd_len = old_cmd_len;
+ scmd->use_sg = old_use_sg;
+ scmd->result = old_result;
return rtn;
}
@@ -537,56 +608,10 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, int timeout)
static int scsi_request_sense(struct scsi_cmnd *scmd)
{
static unsigned char generic_sense[6] =
- {REQUEST_SENSE, 0, 0, 0, 252, 0};
- unsigned char *scsi_result;
- int saved_result;
- int rtn;
+ {REQUEST_SENSE, 0, 0, 0, 252, 0};
memcpy(scmd->cmnd, generic_sense, sizeof(generic_sense));
-
- scsi_result = kmalloc(252, GFP_ATOMIC | ((scmd->device->host->hostt->unchecked_isa_dma) ? __GFP_DMA : 0));
-
-
- if (unlikely(!scsi_result)) {
- printk(KERN_ERR "%s: cannot allocate scsi_result.\n",
- __FUNCTION__);
- return FAILED;
- }
-
- /*
- * zero the sense buffer. some host adapters automatically always
- * request sense, so it is not a good idea that
- * scmd->request_buffer and scmd->sense_buffer point to the same
- * address (db). 0 is not a valid sense code.
- */
- memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
- memset(scsi_result, 0, 252);
-
- saved_result = scmd->result;
- scmd->request_buffer = scsi_result;
- scmd->request_bufflen = 252;
- scmd->use_sg = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- scmd->sc_data_direction = DMA_FROM_DEVICE;
- scmd->underflow = 0;
-
- rtn = scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT);
-
- /* last chance to have valid sense data */
- if(!SCSI_SENSE_VALID(scmd)) {
- memcpy(scmd->sense_buffer, scmd->request_buffer,
- sizeof(scmd->sense_buffer));
- }
-
- kfree(scsi_result);
-
- /*
- * when we eventually call scsi_finish, we really wish to complete
- * the original request, so let's restore the original data. (db)
- */
- scsi_setup_cmd_retry(scmd);
- scmd->result = saved_result;
- return rtn;
+ return scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT, 1);
}
/**
@@ -605,12 +630,6 @@ void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q)
{
scmd->device->host->host_failed--;
scmd->eh_eflags = 0;
-
- /*
- * set this back so that the upper level can correctly free up
- * things.
- */
- scsi_setup_cmd_retry(scmd);
list_move_tail(&scmd->eh_entry, done_q);
}
EXPORT_SYMBOL(scsi_eh_finish_cmd);
@@ -715,47 +734,26 @@ static int scsi_eh_tur(struct scsi_cmnd *scmd)
{
static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0};
int retry_cnt = 1, rtn;
- int saved_result;
retry_tur:
memcpy(scmd->cmnd, tur_command, sizeof(tur_command));
- /*
- * zero the sense buffer. the scsi spec mandates that any
- * untransferred sense data should be interpreted as being zero.
- */
- memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
-
- saved_result = scmd->result;
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
- scmd->use_sg = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- scmd->underflow = 0;
- scmd->sc_data_direction = DMA_NONE;
- rtn = scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT);
+ rtn = scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT, 0);
- /*
- * when we eventually call scsi_finish, we really wish to complete
- * the original request, so let's restore the original data. (db)
- */
- scsi_setup_cmd_retry(scmd);
- scmd->result = saved_result;
-
- /*
- * hey, we are done. let's look to see what happened.
- */
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
__FUNCTION__, scmd, rtn));
- if (rtn == SUCCESS)
- return 0;
- else if (rtn == NEEDS_RETRY) {
+
+ switch (rtn) {
+ case NEEDS_RETRY:
if (retry_cnt--)
goto retry_tur;
+ /*FALLTHRU*/
+ case SUCCESS:
return 0;
+ default:
+ return 1;
}
- return 1;
}
/**
@@ -837,44 +835,16 @@ static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
static int scsi_eh_try_stu(struct scsi_cmnd *scmd)
{
static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0};
- int rtn;
- int saved_result;
- if (!scmd->device->allow_restart)
- return 1;
-
- memcpy(scmd->cmnd, stu_command, sizeof(stu_command));
-
- /*
- * zero the sense buffer. the scsi spec mandates that any
- * untransferred sense data should be interpreted as being zero.
- */
- memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
-
- saved_result = scmd->result;
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
- scmd->use_sg = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- scmd->underflow = 0;
- scmd->sc_data_direction = DMA_NONE;
+ if (scmd->device->allow_restart) {
+ int rtn;
- rtn = scsi_send_eh_cmnd(scmd, START_UNIT_TIMEOUT);
-
- /*
- * when we eventually call scsi_finish, we really wish to complete
- * the original request, so let's restore the original data. (db)
- */
- scsi_setup_cmd_retry(scmd);
- scmd->result = saved_result;
+ memcpy(scmd->cmnd, stu_command, sizeof(stu_command));
+ rtn = scsi_send_eh_cmnd(scmd, START_UNIT_TIMEOUT, 0);
+ if (rtn == SUCCESS)
+ return 0;
+ }
- /*
- * hey, we are done. let's look to see what happened.
- */
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
- __FUNCTION__, scmd, rtn));
- if (rtn == SUCCESS)
- return 0;
return 1;
}
@@ -1684,8 +1654,6 @@ scsi_reset_provider(struct scsi_device *dev, int flag)
scmd->scsi_done = scsi_reset_provider_done_command;
scmd->done = NULL;
- scmd->buffer = NULL;
- scmd->bufflen = 0;
scmd->request_buffer = NULL;
scmd->request_bufflen = 0;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 08af9aae7df..077c1c69121 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -436,60 +436,16 @@ EXPORT_SYMBOL_GPL(scsi_execute_async);
*
* Arguments: cmd - command that is ready to be queued.
*
- * Returns: Nothing
- *
* Notes: This function has the job of initializing a number of
* fields related to error handling. Typically this will
* be called once for each command, as required.
*/
-static int scsi_init_cmd_errh(struct scsi_cmnd *cmd)
+static void scsi_init_cmd_errh(struct scsi_cmnd *cmd)
{
cmd->serial_number = 0;
-
memset(cmd->sense_buffer, 0, sizeof cmd->sense_buffer);
-
if (cmd->cmd_len == 0)
cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
-
- /*
- * We need saved copies of a number of fields - this is because
- * error handling may need to overwrite these with different values
- * to run different commands, and once error handling is complete,
- * we will need to restore these values prior to running the actual
- * command.
- */
- cmd->old_use_sg = cmd->use_sg;
- cmd->old_cmd_len = cmd->cmd_len;
- cmd->sc_old_data_direction = cmd->sc_data_direction;
- cmd->old_underflow = cmd->underflow;
- memcpy(cmd->data_cmnd, cmd->cmnd, sizeof(cmd->cmnd));
- cmd->buffer = cmd->request_buffer;
- cmd->bufflen = cmd->request_bufflen;
-
- return 1;
-}
-
-/*
- * Function: scsi_setup_cmd_retry()
- *
- * Purpose: Restore the command state for a retry
- *
- * Arguments: cmd - command to be restored
- *
- * Returns: Nothing
- *
- * Notes: Immediately prior to retrying a command, we need
- * to restore certain fields that we saved above.
- */
-void scsi_setup_cmd_retry(struct scsi_cmnd *cmd)
-{
- memcpy(cmd->cmnd, cmd->data_cmnd, sizeof(cmd->data_cmnd));
- cmd->request_buffer = cmd->buffer;
- cmd->request_bufflen = cmd->bufflen;
- cmd->use_sg = cmd->old_use_sg;
- cmd->cmd_len = cmd->old_cmd_len;
- cmd->sc_data_direction = cmd->sc_old_data_direction;
- cmd->underflow = cmd->old_underflow;
}
void scsi_device_unbusy(struct scsi_device *sdev)
@@ -807,22 +763,13 @@ static void scsi_free_sgtable(struct scatterlist *sgl, int index)
*/
static void scsi_release_buffers(struct scsi_cmnd *cmd)
{
- struct request *req = cmd->request;
-
- /*
- * Free up any indirection buffers we allocated for DMA purposes.
- */
if (cmd->use_sg)
scsi_free_sgtable(cmd->request_buffer, cmd->sglist_len);
- else if (cmd->request_buffer != req->buffer)
- kfree(cmd->request_buffer);
/*
* Zero these out. They now point to freed memory, and it is
* dangerous to hang onto the pointers.
*/
- cmd->buffer = NULL;
- cmd->bufflen = 0;
cmd->request_buffer = NULL;
cmd->request_bufflen = 0;
}
@@ -858,7 +805,7 @@ static void scsi_release_buffers(struct scsi_cmnd *cmd)
void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
{
int result = cmd->result;
- int this_count = cmd->bufflen;
+ int this_count = cmd->request_bufflen;
request_queue_t *q = cmd->device->request_queue;
struct request *req = cmd->request;
int clear_errors = 1;
@@ -866,28 +813,14 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
int sense_valid = 0;
int sense_deferred = 0;
- /*
- * Free up any indirection buffers we allocated for DMA purposes.
- * For the case of a READ, we need to copy the data out of the
- * bounce buffer and into the real buffer.
- */
- if (cmd->use_sg)
- scsi_free_sgtable(cmd->buffer, cmd->sglist_len);
- else if (cmd->buffer != req->buffer) {
- if (rq_data_dir(req) == READ) {
- unsigned long flags;
- char *to = bio_kmap_irq(req->bio, &flags);
- memcpy(to, cmd->buffer, cmd->bufflen);
- bio_kunmap_irq(to, &flags);
- }
- kfree(cmd->buffer);
- }
+ scsi_release_buffers(cmd);
if (result) {
sense_valid = scsi_command_normalize_sense(cmd, &sshdr);
if (sense_valid)
sense_deferred = scsi_sense_is_deferred(&sshdr);
}
+
if (blk_pc_request(req)) { /* SG_IO ioctl from block level */
req->errors = result;
if (result) {
@@ -908,15 +841,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
}
/*
- * Zero these out. They now point to freed memory, and it is
- * dangerous to hang onto the pointers.
- */
- cmd->buffer = NULL;
- cmd->bufflen = 0;
- cmd->request_buffer = NULL;
- cmd->request_bufflen = 0;
-
- /*
* Next deal with any sectors which we were able to correctly
* handle.
*/
@@ -1012,7 +936,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
if (!(req->flags & REQ_QUIET)) {
scmd_printk(KERN_INFO, cmd,
"Volume overflow, CDB: ");
- __scsi_print_command(cmd->data_cmnd);
+ __scsi_print_command(cmd->cmnd);
scsi_print_sense("", cmd);
}
/* See SSC3rXX or current. */
@@ -1143,7 +1067,7 @@ static void scsi_blk_pc_done(struct scsi_cmnd *cmd)
* successfully. Since this is a REQ_BLOCK_PC command the
* caller should check the request's errors value
*/
- scsi_io_completion(cmd, cmd->bufflen);
+ scsi_io_completion(cmd, cmd->request_bufflen);
}
static void scsi_setup_blk_pc_cmnd(struct scsi_cmnd *cmd)
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index e2fbe9a9d5a..ae24c85aaee 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -57,7 +57,6 @@ extern int scsi_eh_scmd_add(struct scsi_cmnd *, int);
/* scsi_lib.c */
extern int scsi_maybe_unblock_host(struct scsi_device *sdev);
-extern void scsi_setup_cmd_retry(struct scsi_cmnd *cmd);
extern void scsi_device_unbusy(struct scsi_device *sdev);
extern int scsi_queue_insert(struct scsi_cmnd *cmd, int reason);
extern void scsi_next_command(struct scsi_cmnd *cmd);
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3225d31449e..98bd3aab973 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -502,8 +502,7 @@ static int sd_init_command(struct scsi_cmnd * SCpnt)
SCpnt->cmnd[4] = (unsigned char) this_count;
SCpnt->cmnd[5] = 0;
}
- SCpnt->request_bufflen = SCpnt->bufflen =
- this_count * sdp->sector_size;
+ SCpnt->request_bufflen = this_count * sdp->sector_size;
/*
* We shouldn't disconnect in the middle of a sector, so with a dumb
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index fd94408577e..fae6e95a629 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -360,7 +360,7 @@ static int sr_init_command(struct scsi_cmnd * SCpnt)
"mismatch count %d, bytes %d\n",
size, SCpnt->request_bufflen);
if (SCpnt->request_bufflen > size)
- SCpnt->request_bufflen = SCpnt->bufflen = size;
+ SCpnt->request_bufflen = size;
}
}
@@ -387,8 +387,7 @@ static int sr_init_command(struct scsi_cmnd * SCpnt)
if (this_count > 0xffff) {
this_count = 0xffff;
- SCpnt->request_bufflen = SCpnt->bufflen =
- this_count * s_size;
+ SCpnt->request_bufflen = this_count * s_size;
}
SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 371f70d9aa9..58e6444eebe 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -58,9 +58,7 @@ struct scsi_cmnd {
int timeout_per_command;
unsigned char cmd_len;
- unsigned char old_cmd_len;
enum dma_data_direction sc_data_direction;
- enum dma_data_direction sc_old_data_direction;
/* These elements define the operation we are about to perform */
#define MAX_COMMAND_SIZE 16
@@ -71,18 +69,11 @@ struct scsi_cmnd {
void *request_buffer; /* Actual requested buffer */
/* These elements define the operation we ultimately want to perform */
- unsigned char data_cmnd[MAX_COMMAND_SIZE];
- unsigned short old_use_sg; /* We save use_sg here when requesting
- * sense info */
unsigned short use_sg; /* Number of pieces of scatter-gather */
unsigned short sglist_len; /* size of malloc'd scatter-gather list */
- unsigned bufflen; /* Size of data buffer */
- void *buffer; /* Data buffer */
unsigned underflow; /* Return error if less than
this amount is transferred */
- unsigned old_underflow; /* save underflow here when reusing the
- * command for error handling */
unsigned transfersize; /* How much we are guaranteed to
transfer with each SCSI transfer