From 6b66f09c46a8e7f2cfcfcdbc9e45103263b12683 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Fri, 18 Feb 2022 11:50:52 -0800 Subject: scsi: imm: Move the SCSI pointer to private command data Set .cmd_size in the SCSI host template instead of using the SCSI pointer. This patch prepares for removal of the SCSI pointer from struct scsi_cmnd. Link: https://lore.kernel.org/r/20220218195117.25689-25-bvanassche@acm.org Reviewed-by: Johannes Thumshirn Reviewed-by: Himanshu Madhani Signed-off-by: Bart Van Assche Signed-off-by: Martin K. Petersen --- drivers/scsi/imm.c | 88 ++++++++++++++++++++++++++++-------------------------- 1 file changed, 45 insertions(+), 43 deletions(-) (limited to 'drivers/scsi/imm.c') diff --git a/drivers/scsi/imm.c b/drivers/scsi/imm.c index 8afdb4dba2be..7a499d621c25 100644 --- a/drivers/scsi/imm.c +++ b/drivers/scsi/imm.c @@ -66,7 +66,7 @@ static void got_it(imm_struct *dev) { dev->base = dev->dev->port->base; if (dev->cur_cmd) - dev->cur_cmd->SCp.phase = 1; + imm_scsi_pointer(dev->cur_cmd)->phase = 1; else wake_up(dev->waiting); } @@ -618,13 +618,14 @@ static inline int imm_send_command(struct scsi_cmnd *cmd) * The driver appears to remain stable if we speed up the parallel port * i/o in this function, but not elsewhere. */ -static int imm_completion(struct scsi_cmnd *cmd) +static int imm_completion(struct scsi_cmnd *const cmd) { /* Return codes: * -1 Error * 0 Told to schedule * 1 Finished data transfer */ + struct scsi_pointer *scsi_pointer = imm_scsi_pointer(cmd); imm_struct *dev = imm_dev(cmd->device->host); unsigned short ppb = dev->base; unsigned long start_jiffies = jiffies; @@ -660,44 +661,43 @@ static int imm_completion(struct scsi_cmnd *cmd) * a) Drive status is screwy (!ready && !present) * b) Drive is requesting/sending more data than expected */ - if (((r & 0x88) != 0x88) || (cmd->SCp.this_residual <= 0)) { + if ((r & 0x88) != 0x88 || scsi_pointer->this_residual <= 0) { imm_fail(dev, DID_ERROR); return -1; /* ERROR_RETURN */ } /* determine if we should use burst I/O */ if (dev->rd == 0) { - fast = (bulk - && (cmd->SCp.this_residual >= - IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2; - status = imm_out(dev, cmd->SCp.ptr, fast); + fast = bulk && scsi_pointer->this_residual >= + IMM_BURST_SIZE ? IMM_BURST_SIZE : 2; + status = imm_out(dev, scsi_pointer->ptr, fast); } else { - fast = (bulk - && (cmd->SCp.this_residual >= - IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1; - status = imm_in(dev, cmd->SCp.ptr, fast); + fast = bulk && scsi_pointer->this_residual >= + IMM_BURST_SIZE ? IMM_BURST_SIZE : 1; + status = imm_in(dev, scsi_pointer->ptr, fast); } - cmd->SCp.ptr += fast; - cmd->SCp.this_residual -= fast; + scsi_pointer->ptr += fast; + scsi_pointer->this_residual -= fast; if (!status) { imm_fail(dev, DID_BUS_BUSY); return -1; /* ERROR_RETURN */ } - if (cmd->SCp.buffer && !cmd->SCp.this_residual) { + if (scsi_pointer->buffer && !scsi_pointer->this_residual) { /* if scatter/gather, advance to the next segment */ - if (cmd->SCp.buffers_residual--) { - cmd->SCp.buffer = sg_next(cmd->SCp.buffer); - cmd->SCp.this_residual = - cmd->SCp.buffer->length; - cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); + if (scsi_pointer->buffers_residual--) { + scsi_pointer->buffer = + sg_next(scsi_pointer->buffer); + scsi_pointer->this_residual = + scsi_pointer->buffer->length; + scsi_pointer->ptr = sg_virt(scsi_pointer->buffer); /* * Make sure that we transfer even number of bytes * otherwise it makes imm_byte_out() messy. */ - if (cmd->SCp.this_residual & 0x01) - cmd->SCp.this_residual++; + if (scsi_pointer->this_residual & 0x01) + scsi_pointer->this_residual++; } } /* Now check to see if the drive is ready to comunicate */ @@ -762,7 +762,7 @@ static void imm_interrupt(struct work_struct *work) } #endif - if (cmd->SCp.phase > 1) + if (imm_scsi_pointer(cmd)->phase > 1) imm_disconnect(dev); imm_pb_dismiss(dev); @@ -774,8 +774,9 @@ static void imm_interrupt(struct work_struct *work) return; } -static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) +static int imm_engine(imm_struct *dev, struct scsi_cmnd *const cmd) { + struct scsi_pointer *scsi_pointer = imm_scsi_pointer(cmd); unsigned short ppb = dev->base; unsigned char l = 0, h = 0; int retv, x; @@ -786,7 +787,7 @@ static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) if (dev->failed) return 0; - switch (cmd->SCp.phase) { + switch (scsi_pointer->phase) { case 0: /* Phase 0 - Waiting for parport */ if (time_after(jiffies, dev->jstart + HZ)) { /* @@ -800,7 +801,7 @@ static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) case 1: /* Phase 1 - Connected */ imm_connect(dev, CONNECT_EPP_MAYBE); - cmd->SCp.phase++; + scsi_pointer->phase++; fallthrough; case 2: /* Phase 2 - We are now talking to the scsi bus */ @@ -808,7 +809,7 @@ static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) imm_fail(dev, DID_NO_CONNECT); return 0; } - cmd->SCp.phase++; + scsi_pointer->phase++; fallthrough; case 3: /* Phase 3 - Ready to accept a command */ @@ -818,23 +819,23 @@ static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) if (!imm_send_command(cmd)) return 0; - cmd->SCp.phase++; + scsi_pointer->phase++; fallthrough; case 4: /* Phase 4 - Setup scatter/gather buffers */ if (scsi_bufflen(cmd)) { - cmd->SCp.buffer = scsi_sglist(cmd); - cmd->SCp.this_residual = cmd->SCp.buffer->length; - cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); + scsi_pointer->buffer = scsi_sglist(cmd); + scsi_pointer->this_residual = scsi_pointer->buffer->length; + scsi_pointer->ptr = sg_virt(scsi_pointer->buffer); } else { - cmd->SCp.buffer = NULL; - cmd->SCp.this_residual = 0; - cmd->SCp.ptr = NULL; + scsi_pointer->buffer = NULL; + scsi_pointer->this_residual = 0; + scsi_pointer->ptr = NULL; } - cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; - cmd->SCp.phase++; - if (cmd->SCp.this_residual & 0x01) - cmd->SCp.this_residual++; + scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1; + scsi_pointer->phase++; + if (scsi_pointer->this_residual & 0x01) + scsi_pointer->this_residual++; fallthrough; case 5: /* Phase 5 - Pre-Data transfer stage */ @@ -851,7 +852,7 @@ static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) if ((dev->dp) && (dev->rd)) if (imm_negotiate(dev)) return 0; - cmd->SCp.phase++; + scsi_pointer->phase++; fallthrough; case 6: /* Phase 6 - Data transfer stage */ @@ -867,7 +868,7 @@ static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) if (retv == 0) return 1; } - cmd->SCp.phase++; + scsi_pointer->phase++; fallthrough; case 7: /* Phase 7 - Post data transfer stage */ @@ -879,7 +880,7 @@ static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) w_ctr(ppb, 0x4); } } - cmd->SCp.phase++; + scsi_pointer->phase++; fallthrough; case 8: /* Phase 8 - Read status/message */ @@ -922,7 +923,7 @@ static int imm_queuecommand_lck(struct scsi_cmnd *cmd) dev->jstart = jiffies; dev->cur_cmd = cmd; cmd->result = DID_ERROR << 16; /* default return code */ - cmd->SCp.phase = 0; /* bus free */ + imm_scsi_pointer(cmd)->phase = 0; /* bus free */ schedule_delayed_work(&dev->imm_tq, 0); @@ -961,7 +962,7 @@ static int imm_abort(struct scsi_cmnd *cmd) * have tied the SCSI_MESSAGE line high in the interface */ - switch (cmd->SCp.phase) { + switch (imm_scsi_pointer(cmd)->phase) { case 0: /* Do not have access to parport */ case 1: /* Have not connected to interface */ dev->cur_cmd = NULL; /* Forget the problem */ @@ -987,7 +988,7 @@ static int imm_reset(struct scsi_cmnd *cmd) { imm_struct *dev = imm_dev(cmd->device->host); - if (cmd->SCp.phase) + if (imm_scsi_pointer(cmd)->phase) imm_disconnect(dev); dev->cur_cmd = NULL; /* Forget the problem */ @@ -1109,6 +1110,7 @@ static struct scsi_host_template imm_template = { .sg_tablesize = SG_ALL, .can_queue = 1, .slave_alloc = imm_adjust_queue, + .cmd_size = sizeof(struct scsi_pointer), }; 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