diff options
| -rw-r--r-- | drivers/scsi/atari_NCR5380.c | 72 | ||||
| -rw-r--r-- | drivers/scsi/atari_scsi.c | 47 |
2 files changed, 62 insertions, 57 deletions
diff --git a/drivers/scsi/atari_NCR5380.c b/drivers/scsi/atari_NCR5380.c index 371ca14f08ea..795522192d36 100644 --- a/drivers/scsi/atari_NCR5380.c +++ b/drivers/scsi/atari_NCR5380.c @@ -925,7 +925,7 @@ static int NCR5380_queue_command(struct Scsi_Host *instance, * because also a timer int can trigger an abort or reset, which would * alter queues and touch the lock. */ - if (!falcon_get_lock()) + if (!NCR5380_acquire_dma_irq(instance)) return SCSI_MLQUEUE_HOST_BUSY; local_irq_save(flags); @@ -960,6 +960,18 @@ static int NCR5380_queue_command(struct Scsi_Host *instance, return 0; } +static inline void maybe_release_dma_irq(struct Scsi_Host *instance) +{ + struct NCR5380_hostdata *hostdata = shost_priv(instance); + + /* Caller does the locking needed to set & test these data atomically */ + if (!hostdata->disconnected_queue && + !hostdata->issue_queue && + !hostdata->connected && + !hostdata->retain_dma_intr) + NCR5380_release_dma_irq(instance); +} + /* * Function : NCR5380_main (void) * @@ -1082,9 +1094,11 @@ static void NCR5380_main(struct work_struct *work) cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); #endif if (!NCR5380_select(instance, tmp)) { + local_irq_disable(); hostdata->retain_dma_intr--; /* release if target did not response! */ - falcon_release_lock_if_possible(hostdata); + maybe_release_dma_irq(instance); + local_irq_restore(flags); break; } else { local_irq_disable(); @@ -2083,11 +2097,12 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) case COMMAND_COMPLETE: /* Accept message by clearing ACK */ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); - /* ++guenther: possible race with Falcon locking */ - hostdata->retain_dma_intr++; - hostdata->connected = NULL; dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu " "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); + + local_irq_save(flags); + hostdata->retain_dma_intr++; + hostdata->connected = NULL; #ifdef SUPPORT_TAGS cmd_free_tag(cmd); if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { @@ -2146,17 +2161,17 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO); - local_irq_save(flags); LIST(cmd,hostdata->issue_queue); SET_NEXT(cmd, hostdata->issue_queue); hostdata->issue_queue = (struct scsi_cmnd *) cmd; - local_irq_restore(flags); dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of " "issue queue\n", H_NO(cmd)); } else { cmd->scsi_done(cmd); } + local_irq_restore(flags); + NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); /* * Restore phase bits to 0 so an interrupted selection, @@ -2167,12 +2182,14 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) barrier(); + local_irq_save(flags); hostdata->retain_dma_intr--; /* ++roman: For Falcon SCSI, release the lock on the * ST-DMA here if no other commands are waiting on the * disconnected queue. */ - falcon_release_lock_if_possible(hostdata); + maybe_release_dma_irq(instance); + local_irq_restore(flags); return; case MESSAGE_REJECT: /* Accept message by clearing ACK */ @@ -2331,6 +2348,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) hostdata->last_message = msgout; NCR5380_transfer_pio(instance, &phase, &len, &data); if (msgout == ABORT) { + local_irq_save(flags); #ifdef SUPPORT_TAGS cmd_free_tag(cmd); #else @@ -2338,9 +2356,10 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) #endif hostdata->connected = NULL; cmd->result = DID_ERROR << 16; - cmd->scsi_done(cmd); NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); - falcon_release_lock_if_possible(hostdata); + maybe_release_dma_irq(instance); + local_irq_restore(flags); + cmd->scsi_done(cmd); return; } msgout = NOP; @@ -2393,7 +2412,6 @@ static void NCR5380_reselect(struct Scsi_Host *instance) unsigned char msg[3]; unsigned char *data; struct scsi_cmnd *tmp = NULL, *prev; -/* unsigned long flags; */ /* * Disable arbitration, etc. since the host adapter obviously @@ -2473,8 +2491,6 @@ static void NCR5380_reselect(struct Scsi_Host *instance) && (tag == tmp->tag) #endif ) { - /* ++guenther: prevent race with falcon_release_lock */ - hostdata->retain_dma_intr++; if (prev) { REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); SET_NEXT(prev, NEXT(tmp)); @@ -2512,7 +2528,6 @@ static void NCR5380_reselect(struct Scsi_Host *instance) hostdata->connected = tmp; dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n", HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); - hostdata->retain_dma_intr--; } @@ -2587,12 +2602,12 @@ int NCR5380_abort(struct scsi_cmnd *cmd) #else hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); #endif + maybe_release_dma_irq(instance); local_irq_restore(flags); cmd->scsi_done(cmd); - falcon_release_lock_if_possible(hostdata); return SUCCESS; } else { -/* local_irq_restore(flags); */ + local_irq_restore(flags); printk("scsi%d: abort of connected command failed!\n", HOSTNO); return FAILED; } @@ -2611,13 +2626,13 @@ int NCR5380_abort(struct scsi_cmnd *cmd) (*prev) = NEXT(tmp); SET_NEXT(tmp, NULL); tmp->result = DID_ABORT << 16; + maybe_release_dma_irq(instance); local_irq_restore(flags); dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", HOSTNO); /* Tagged queuing note: no tag to free here, hasn't been assigned * yet... */ tmp->scsi_done(tmp); - falcon_release_lock_if_possible(hostdata); return SUCCESS; } } @@ -2695,15 +2710,22 @@ int NCR5380_abort(struct scsi_cmnd *cmd) #else hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); #endif + maybe_release_dma_irq(instance); local_irq_restore(flags); tmp->scsi_done(tmp); - falcon_release_lock_if_possible(hostdata); return SUCCESS; } } } } + /* Maybe it is sufficient just to release the ST-DMA lock... (if + * possible at all) At least, we should check if the lock could be + * released after the abort, in case it is kept due to some bug. + */ + maybe_release_dma_irq(instance); + local_irq_restore(flags); + /* * Case 5 : If we reached this point, the command was not found in any of * the queues. @@ -2714,15 +2736,8 @@ int NCR5380_abort(struct scsi_cmnd *cmd) * broke. */ - local_irq_restore(flags); printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); - /* Maybe it is sufficient just to release the ST-DMA lock... (if - * possible at all) At least, we should check if the lock could be - * released after the abort, in case it is kept due to some bug. - */ - falcon_release_lock_if_possible(hostdata); - return FAILED; } @@ -2738,14 +2753,15 @@ int NCR5380_abort(struct scsi_cmnd *cmd) static int NCR5380_bus_reset(struct scsi_cmnd *cmd) { - SETUP_HOSTDATA(cmd->device->host); + struct Scsi_Host *instance = cmd->device->host; + struct NCR5380_hostdata *hostdata = shost_priv(instance); int i; unsigned long flags; #if defined(RESET_RUN_DONE) struct scsi_cmnd *connected, *disconnected_queue; #endif - NCR5380_print_status(cmd->device->host); + NCR5380_print_status(instance); /* get in phase */ NCR5380_write(TARGET_COMMAND_REG, @@ -2870,6 +2886,8 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) #ifdef REAL_DMA hostdata->dma_len = 0; #endif + + maybe_release_dma_irq(instance); local_irq_restore(flags); /* we did no complete reset of all commands, so a wakeup is required */ diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c index 70c662f9fee4..045112186f84 100644 --- a/drivers/scsi/atari_scsi.c +++ b/drivers/scsi/atari_scsi.c @@ -109,6 +109,9 @@ #define NCR5380_dma_xfer_len(instance, cmd, phase) \ atari_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO)) +#define NCR5380_acquire_dma_irq(instance) falcon_get_lock() +#define NCR5380_release_dma_irq(instance) falcon_release_lock() + #include "NCR5380.h" @@ -448,23 +451,13 @@ static void atari_scsi_fetch_restbytes(void) * connected command and the disconnected queue is empty. */ -static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata) +static void falcon_release_lock(void) { - unsigned long flags; - if (IS_A_TT()) return; - local_irq_save(flags); - - if (!hostdata->disconnected_queue && - !hostdata->issue_queue && - !hostdata->connected && - !hostdata->retain_dma_intr && - stdma_is_locked_by(scsi_falcon_intr)) + if (stdma_is_locked_by(scsi_falcon_intr)) stdma_release(); - - local_irq_restore(flags); } /* This function manages the locking of the ST-DMA. @@ -787,36 +780,30 @@ static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value) static int atari_scsi_bus_reset(struct scsi_cmnd *cmd) { int rv; - struct NCR5380_hostdata *hostdata = shost_priv(cmd->device->host); + unsigned long flags; + + local_irq_save(flags); - /* For doing the reset, SCSI interrupts must be disabled first, - * since the 5380 raises its IRQ line while _RST is active and we - * can't disable interrupts completely, since we need the timer. - */ - /* And abort a maybe active DMA transfer */ - if (IS_A_TT()) { - atari_turnoff_irq(IRQ_TT_MFP_SCSI); #ifdef REAL_DMA + /* Abort a maybe active DMA transfer */ + if (IS_A_TT()) { tt_scsi_dma.dma_ctrl = 0; -#endif } else { - atari_turnoff_irq(IRQ_MFP_FSCSI); -#ifdef REAL_DMA st_dma.dma_mode_status = 0x90; atari_dma_active = 0; atari_dma_orig_addr = NULL; -#endif } +#endif rv = NCR5380_bus_reset(cmd); - if (IS_A_TT()) - atari_turnon_irq(IRQ_TT_MFP_SCSI); - else - atari_turnon_irq(IRQ_MFP_FSCSI); + /* The 5380 raises its IRQ line while _RST is active but the ST DMA + * "lock" has been released so this interrupt may end up handled by + * floppy or IDE driver (if one of them holds the lock). The NCR5380 + * interrupt flag has been cleared already. + */ - if (rv == SUCCESS) - falcon_release_lock_if_possible(hostdata); + local_irq_restore(flags); return rv; } |