ide-atapi: remove pc->buf

Now after all users of pc->buf have been converted, remove the 64B buffer
embedded in each packet command.

There should be no functional change resulting from this patch.
Signed-off-by: NBorislav Petkov <petkovbb@gmail.com>

drivers/ide/ide-atapi.c

@@ -74,8 +74,6 @@ EXPORT_SYMBOL_GPL(ide_check_atapi_device);
 void ide_init_pc(struct ide_atapi_pc *pc)
 {
 	memset(pc, 0, sizeof(*pc));
-	pc->buf = pc->pc_buf;
-	pc->buf_size = IDE_PC_BUFFER_SIZE;
 }
 EXPORT_SYMBOL_GPL(ide_init_pc);
 
@@ -254,10 +252,6 @@ void ide_retry_pc(ide_drive_t *drive)
 	ide_init_pc(pc);
 	memcpy(pc->c, sense_rq->cmd, 12);
 
-	/* pointer to mapped address */
-	pc->buf = bio_data(sense_rq->bio);
-	pc->req_xfer = blk_rq_bytes(sense_rq);
-
 	if (drive->media == ide_tape)
 		set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
 

drivers/ide/ide-floppy.c

@@ -210,8 +210,7 @@ static void idefloppy_create_rw_cmd(ide_drive_t *drive,
 	pc->rq = rq;
 	if (rq->cmd_flags & REQ_RW)
 		pc->flags |= PC_FLAG_WRITING;
-	pc->buf = NULL;
-	pc->buf_size = blk_rq_bytes(rq);
+
 	pc->flags |= PC_FLAG_DMA_OK;
 }
 
@@ -226,9 +225,6 @@ static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
 		if (rq_data_dir(rq) == WRITE)
 			pc->flags |= PC_FLAG_WRITING;
 	}
-	/* pio will be performed by ide_pio_bytes() which handles sg fine */
-	pc->buf = NULL;
-	pc->buf_size = blk_rq_bytes(rq);
 }
 
 static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
@@ -388,8 +384,6 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
 	drive->capacity64 = 0;
 
 	ide_floppy_create_read_capacity_cmd(&pc);
-	pc.buf_size = sizeof(pc_buf);
-
 	if (ide_queue_pc_tail(drive, disk, &pc, pc_buf, pc.req_xfer)) {
 		printk(KERN_ERR PFX "Can't get floppy parameters\n");
 		return 1;

drivers/ide/ide-floppy_ioctl.c

@@ -47,7 +47,6 @@ static int ide_floppy_get_format_capacities(ide_drive_t *drive,
 		return -EINVAL;
 
 	ide_floppy_create_read_capacity_cmd(pc);
-	pc->buf_size = sizeof(pc_buf);
 
 	if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) {
 		printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");

drivers/ide/ide-tape.c

@@ -568,9 +568,8 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
 	ide_init_pc(pc);
 	put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
 	pc->c[1] = 1;
-	pc->buf = NULL;
-	pc->buf_size = blk_rq_bytes(rq);
-	if (pc->buf_size == tape->buffer_size)
+
+	if (blk_rq_bytes(rq) == tape->buffer_size)
 		pc->flags |= PC_FLAG_DMA_OK;
 
 	if (opcode == READ_6)
@@ -1608,8 +1607,6 @@ static void idetape_get_inquiry_results(ide_drive_t *drive)
 	char fw_rev[4], vendor_id[8], product_id[16];
 
 	idetape_create_inquiry_cmd(&pc);
-	pc.buf_size = sizeof(pc_buf);
-
 	if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) {
 		printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
 				tape->name);

include/linux/ide.h

@@ -341,11 +341,6 @@ enum {
 	PC_FLAG_WRITING			= (1 << 6),
 };
 
-/*
- * With each packet command, we allocate a buffer of IDE_PC_BUFFER_SIZE bytes.
- * This is used for several packet commands (not for READ/WRITE commands).
- */
-#define IDE_PC_BUFFER_SIZE	64
 #define ATAPI_WAIT_PC		(60 * HZ)
 
 struct ide_atapi_pc {
@@ -358,10 +353,6 @@ struct ide_atapi_pc {
 	/* bytes to transfer */
 	int req_xfer;
 
-	/* data buffer */
-	u8 *buf;
-	int buf_size;
-
 	/* the corresponding request */
 	struct request *rq;
 
@@ -371,8 +362,6 @@ struct ide_atapi_pc {
 	 * those are more or less driver-specific and some of them are subject
 	 * to change/removal later.
 	 */
-	u8 pc_buf[IDE_PC_BUFFER_SIZE];
-
 	unsigned long timeout;
 };