From: Finn Thain fthain@telegraphics.com.au
[ Upstream commit dad8261e643849ea134c7cd5c8e794e31d93b9eb ]
The return value is taken to mean "retry" or "don't retry". Change it to bool to improve readability. Fix related comments. No functional change.
Tested-by: Michael Schmitz schmitzmic@gmail.com Signed-off-by: Finn Thain fthain@telegraphics.com.au Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/NCR5380.c | 46 +++++++++++++++++++----------------------- drivers/scsi/NCR5380.h | 2 +- 2 files changed, 22 insertions(+), 26 deletions(-)
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index 9131d30b2da75..60e051c249a6f 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -904,20 +904,16 @@ static irqreturn_t __maybe_unused NCR5380_intr(int irq, void *dev_id) return IRQ_RETVAL(handled); }
-/* - * Function : int NCR5380_select(struct Scsi_Host *instance, - * struct scsi_cmnd *cmd) - * - * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, - * including ARBITRATION, SELECTION, and initial message out for - * IDENTIFY and queue messages. +/** + * NCR5380_select - attempt arbitration and selection for a given command + * @instance: the Scsi_Host instance + * @cmd: the scsi_cmnd to execute * - * Inputs : instance - instantiation of the 5380 driver on which this - * target lives, cmd - SCSI command to execute. + * This routine establishes an I_T_L nexus for a SCSI command. This involves + * ARBITRATION, SELECTION and MESSAGE OUT phases and an IDENTIFY message. * - * Returns cmd if selection failed but should be retried, - * NULL if selection failed and should not be retried, or - * NULL if selection succeeded (hostdata->connected == cmd). + * Returns true if the operation should be retried. + * Returns false if it should not be retried. * * Side effects : * If bus busy, arbitration failed, etc, NCR5380_select() will exit @@ -925,16 +921,15 @@ static irqreturn_t __maybe_unused NCR5380_intr(int irq, void *dev_id) * SELECT_ENABLE will be set appropriately, the NCR5380 * will cease to drive any SCSI bus signals. * - * If successful : I_T_L or I_T_L_Q nexus will be established, - * instance->connected will be set to cmd. + * If successful : the I_T_L nexus will be established, and + * hostdata->connected will be set to cmd. * SELECT interrupt will be disabled. * * If failed (no target) : cmd->scsi_done() will be called, and the * cmd->result host byte set to DID_BAD_TARGET. */
-static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, - struct scsi_cmnd *cmd) +static bool NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) __releases(&hostdata->lock) __acquires(&hostdata->lock) { struct NCR5380_hostdata *hostdata = shost_priv(instance); @@ -942,6 +937,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, unsigned char *data; int len; int err; + bool ret = true;
NCR5380_dprint(NDEBUG_ARBITRATION, instance); dsprintk(NDEBUG_ARBITRATION, instance, "starting arbitration, id = %d\n", @@ -950,7 +946,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, /* * Arbitration and selection phases are slow and involve dropping the * lock, so we have to watch out for EH. An exception handler may - * change 'selecting' to NULL. This function will then return NULL + * change 'selecting' to NULL. This function will then return false * so that the caller will forget about 'cmd'. (During information * transfer phases, EH may change 'connected' to NULL.) */ @@ -986,7 +982,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, if (!hostdata->selecting) { /* Command was aborted */ NCR5380_write(MODE_REG, MR_BASE); - return NULL; + return false; } if (err < 0) { NCR5380_write(MODE_REG, MR_BASE); @@ -1035,7 +1031,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, if (!hostdata->selecting) { NCR5380_write(MODE_REG, MR_BASE); NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); - return NULL; + return false; }
dsprintk(NDEBUG_ARBITRATION, instance, "won arbitration\n"); @@ -1118,13 +1114,13 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
/* Can't touch cmd if it has been reclaimed by the scsi ML */ if (!hostdata->selecting) - return NULL; + return false;
cmd->result = DID_BAD_TARGET << 16; complete_cmd(instance, cmd); dsprintk(NDEBUG_SELECTION, instance, "target did not respond within 250ms\n"); - cmd = NULL; + ret = false; goto out; }
@@ -1156,7 +1152,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, } if (!hostdata->selecting) { do_abort(instance); - return NULL; + return false; }
dsprintk(NDEBUG_SELECTION, instance, "target %d selected, going into MESSAGE OUT phase.\n", @@ -1172,7 +1168,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, cmd->result = DID_ERROR << 16; complete_cmd(instance, cmd); dsprintk(NDEBUG_SELECTION, instance, "IDENTIFY message transfer failed\n"); - cmd = NULL; + ret = false; goto out; }
@@ -1187,13 +1183,13 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
initialize_SCp(cmd);
- cmd = NULL; + ret = false;
out: if (!hostdata->selecting) return NULL; hostdata->selecting = NULL; - return cmd; + return ret; }
/* diff --git a/drivers/scsi/NCR5380.h b/drivers/scsi/NCR5380.h index 8a6d002e67894..5935fd6d1a058 100644 --- a/drivers/scsi/NCR5380.h +++ b/drivers/scsi/NCR5380.h @@ -275,7 +275,7 @@ static irqreturn_t NCR5380_intr(int irq, void *dev_id); static void NCR5380_main(struct work_struct *work); static const char *NCR5380_info(struct Scsi_Host *instance); static void NCR5380_reselect(struct Scsi_Host *instance); -static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *, struct scsi_cmnd *); +static bool NCR5380_select(struct Scsi_Host *, struct scsi_cmnd *); static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data); static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data); static int NCR5380_poll_politely2(struct NCR5380_hostdata *,