[PATCH 62/71] ncr5380: Implement new eh_bus_reset_handler

Finn Thain
2015-11-18T08:35:57Z

[-- Attachment #1: ncr5380-new-eh_bus_reset_handler --]
[-- Type: text/plain, Size: 5028 bytes --]

NCR5380.c lacks a sane eh_bus_reset_handler. The atari_NCR5380.c code is
much better but it should not throw out the issue queue (that would be
a host reset) and it neglects to set the result code for commands that it
throws out. Fix these bugs and keep the two core drivers in sync.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>

---
drivers/scsi/NCR5380.c | 50 ++++++++++++++++++++++++++++++++++++++++++-
drivers/scsi/atari_NCR5380.c | 39 +++++++++++++++++++--------------
2 files changed, 72 insertions(+), 17 deletions(-)

Index: linux/drivers/scsi/atari_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/atari_NCR5380.c 2015-11-18 19:34:29.000000000 +1100
+++ linux/drivers/scsi/atari_NCR5380.c 2015-11-18 19:34:30.000000000 +1100
@@ -2703,11 +2703,12 @@ static int NCR5380_bus_reset(struct scsi
struct NCR5380_hostdata *hostdata = shost_priv(instance);
int i;
unsigned long flags;
+ struct NCR5380_cmd *ncmd;

spin_lock_irqsave(&hostdata->lock, flags);

#if (NDEBUG & NDEBUG_ANY)
- scmd_printk(KERN_INFO, cmd, "performing bus reset\n");
+ scmd_printk(KERN_INFO, cmd, __func__);
#endif
NCR5380_dprint(NDEBUG_ANY, instance);
NCR5380_dprint_phase(NDEBUG_ANY, instance);
@@ -2727,27 +2728,32 @@ static int NCR5380_bus_reset(struct scsi

hostdata->selecting = NULL;

- if (hostdata->connected)
- dsprintk(NDEBUG_ABORT, instance, "reset aborted a connected command\n");
- hostdata->connected = NULL;
+ list_for_each_entry(ncmd, &hostdata->disconnected, list) {
+ struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
+
+ set_host_byte(cmd, DID_RESET);
+ cmd->scsi_done(cmd);
+ }
+
+ list_for_each_entry(ncmd, &hostdata->autosense, list) {
+ struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
+
+ set_host_byte(cmd, DID_RESET);
+ cmd->scsi_done(cmd);
+ }
+
+ if (hostdata->connected) {
+ set_host_byte(hostdata->connected, DID_RESET);
+ complete_cmd(instance, hostdata->connected);
+ hostdata->connected = NULL;
+ }

if (hostdata->sensing) {
+ set_host_byte(hostdata->connected, DID_RESET);
complete_cmd(instance, hostdata->sensing);
hostdata->sensing = NULL;
}

- if (!list_empty(&hostdata->autosense))
- dsprintk(NDEBUG_ABORT, instance, "reset aborted autosense list\n");
- INIT_LIST_HEAD(&hostdata->autosense);
-
- if (!list_empty(&hostdata->unissued))
- dsprintk(NDEBUG_ABORT, instance, "reset aborted unissued list\n");
- INIT_LIST_HEAD(&hostdata->unissued);
-
- if (!list_empty(&hostdata->disconnected))
- dsprintk(NDEBUG_ABORT, instance, "reset aborted disconnected list\n");
- INIT_LIST_HEAD(&hostdata->disconnected);
-
#ifdef SUPPORT_TAGS
free_all_tags(hostdata);
#endif
@@ -2757,6 +2763,7 @@ static int NCR5380_bus_reset(struct scsi
hostdata->dma_len = 0;
#endif

+ queue_work(hostdata->work_q, &hostdata->main_task);
maybe_release_dma_irq(instance);
spin_unlock_irqrestore(&hostdata->lock, flags);

Index: linux/drivers/scsi/NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/NCR5380.c 2015-11-18 19:34:29.000000000 +1100
+++ linux/drivers/scsi/NCR5380.c 2015-11-18 19:34:30.000000000 +1100
@@ -2489,18 +2489,66 @@ static int NCR5380_bus_reset(struct scsi
{
struct Scsi_Host *instance = cmd->device->host;
struct NCR5380_hostdata *hostdata = shost_priv(instance);
+ int i;
unsigned long flags;
+ struct NCR5380_cmd *ncmd;

spin_lock_irqsave(&hostdata->lock, flags);

#if (NDEBUG & NDEBUG_ANY)
- scmd_printk(KERN_INFO, cmd, "performing bus reset\n");
+ scmd_printk(KERN_INFO, cmd, __func__);
#endif
NCR5380_dprint(NDEBUG_ANY, instance);
NCR5380_dprint_phase(NDEBUG_ANY, instance);

do_reset(instance);

+ /* reset NCR registers */
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+ NCR5380_write(SELECT_ENABLE_REG, 0);
+
+ /* After the reset, there are no more connected or disconnected commands
+ * and no busy units; so clear the low-level status here to avoid
+ * conflicts when the mid-level code tries to wake up the affected
+ * commands!
+ */
+
+ hostdata->selecting = NULL;
+
+ list_for_each_entry(ncmd, &hostdata->disconnected, list) {
+ struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
+
+ set_host_byte(cmd, DID_RESET);
+ cmd->scsi_done(cmd);
+ }
+
+ list_for_each_entry(ncmd, &hostdata->autosense, list) {
+ struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
+
+ set_host_byte(cmd, DID_RESET);
+ cmd->scsi_done(cmd);
+ }
+
+ if (hostdata->connected) {
+ set_host_byte(hostdata->connected, DID_RESET);
+ complete_cmd(instance, hostdata->connected);
+ hostdata->connected = NULL;
+ }
+
+ if (hostdata->sensing) {
+ set_host_byte(hostdata->connected, DID_RESET);
+ complete_cmd(instance, hostdata->sensing);
+ hostdata->sensing = NULL;
+ }
+
+ for (i = 0; i < 8; ++i)
+ hostdata->busy[i] = 0;
+#ifdef REAL_DMA
+ hostdata->dma_len = 0;
+#endif
+
+ queue_work(hostdata->work_q, &hostdata->main_task);
spin_unlock_irqrestore(&hostdata->lock, flags);

return SUCCESS;