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scsi: mac53c94: Stop using struct scsi_pointer

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This driver doesn't use SCp.ptr to save a SCSI command data pointer which
means "scsi pointer" is a complete misnomer here. Only a few members of
struct scsi_pointer are used and the rest waste memory.  Avoid the "struct
foo { struct bar; };" silliness.

Link: https://lore.kernel.org/r/3529a59873a7de8455a27af2528341afe5069adc.1645484982.git.fthain@linux-m68k.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2022-02-22 10:09:42 +11:00 committed by Martin K. Petersen
parent 2e1b3175f2
commit 55a94551f6
2 changed files with 15 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/scsi/mac53c94.c
View File

@ -194,7 +194,7 @@ static void mac53c94_interrupt(int irq, void *dev_id)
struct mac53c94_regs __iomem *regs = state->regs;
struct dbdma_regs __iomem *dma = state->dma;
struct scsi_cmnd *const cmd = state->current_req;
struct scsi_pointer *const scsi_pointer = mac53c94_scsi_pointer(cmd);
struct mac53c94_cmd_priv *const mcmd = mac53c94_priv(cmd);
int nb, stat, seq, intr;
static int mac53c94_errors;
@ -264,10 +264,10 @@ static void mac53c94_interrupt(int irq, void *dev_id)
/* set DMA controller going if any data to transfer */
if ((stat & (STAT_MSG|STAT_CD)) == 0
&& (scsi_sg_count(cmd) > 0 || scsi_bufflen(cmd))) {
nb = scsi_pointer->this_residual;
nb = mcmd->this_residual;
if (nb > 0xfff0)
nb = 0xfff0;
scsi_pointer->this_residual -= nb;
mcmd->this_residual -= nb;
writeb(nb, &regs->count_lo);
writeb(nb >> 8, &regs->count_mid);
writeb(CMD_DMA_MODE + CMD_NOP, &regs->command);
@ -294,13 +294,13 @@ static void mac53c94_interrupt(int irq, void *dev_id)
cmd_done(state, DID_ERROR << 16);
return;
}
if (scsi_pointer->this_residual != 0
if (mcmd->this_residual != 0
&& (stat & (STAT_MSG|STAT_CD)) == 0) {
/* Set up the count regs to transfer more */
nb = scsi_pointer->this_residual;
nb = mcmd->this_residual;
if (nb > 0xfff0)
nb = 0xfff0;
scsi_pointer->this_residual -= nb;
mcmd->this_residual -= nb;
writeb(nb, &regs->count_lo);
writeb(nb >> 8, &regs->count_mid);
writeb(CMD_DMA_MODE + CMD_NOP, &regs->command);
@ -322,8 +322,8 @@ static void mac53c94_interrupt(int irq, void *dev_id)
cmd_done(state, DID_ERROR << 16);
return;
}
scsi_pointer->Status = readb(&regs->fifo);
scsi_pointer->Message = readb(&regs->fifo);
mcmd->status = readb(&regs->fifo);
mcmd->message = readb(&regs->fifo);
writeb(CMD_ACCEPT_MSG, &regs->command);
state->phase = busfreeing;
break;
@ -331,8 +331,7 @@ static void mac53c94_interrupt(int irq, void *dev_id)
if (intr != INTR_DISCONNECT) {
printk(KERN_DEBUG "got intr %x when expected disconnect\n", intr);
}
cmd_done(state, (DID_OK << 16) + (scsi_pointer->Message << 8)
+ scsi_pointer->Status);
cmd_done(state, (DID_OK << 16) + (mcmd->message << 8) + mcmd->status);
break;
default:
printk(KERN_DEBUG "don't know about phase %d\n", state->phase);
@ -390,7 +389,7 @@ static void set_dma_cmds(struct fsc_state *state, struct scsi_cmnd *cmd)
dma_cmd += OUTPUT_LAST - OUTPUT_MORE;
dcmds[-1].command = cpu_to_le16(dma_cmd);
dcmds->command = cpu_to_le16(DBDMA_STOP);
mac53c94_scsi_pointer(cmd)->this_residual = total;
mac53c94_priv(cmd)->this_residual = total;
}
static struct scsi_host_template mac53c94_template = {

10
drivers/scsi/mac53c94.h
View File

@ -213,14 +213,14 @@ struct mac53c94_regs {
#define CF4_BBTE 0x01
struct mac53c94_cmd_priv {
struct scsi_pointer scsi_pointer;
int this_residual;
int status;
int message;
};
static inline struct scsi_pointer *mac53c94_scsi_pointer(struct scsi_cmnd *cmd)
static inline struct mac53c94_cmd_priv *mac53c94_priv(struct scsi_cmnd *cmd)
{
struct mac53c94_cmd_priv *mcmd = scsi_cmd_priv(cmd);
return &mcmd->scsi_pointer;
return scsi_cmd_priv(cmd);
}
#endif /* _MAC53C94_H */