ide-{floppy,tape}: remove packet command stack
* Add 'struct ide_atapi_pc queued_pc' to struct ide_{floppy,tape}_obj
and switch ide*_do_request() to use it (there can be only one active
request for a given device).
* Add 'struct ide_atapi_pc request_sense_pc' to struct ide_*_obj
and switch ide*_retry_pc() to use it.
* Remove needless {floppy,tape}->pc assignment from ide*_setup().
* Remove no longer needed ide*_next_pc_storage(), pc_stack[],
rq_stack_index, IDE*_PC_STACK and DBG_PC_STACK.
There should be no functional changes caused by this patch.
Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index dd35335..ba05e03 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -56,8 +56,6 @@
DBG_CHRDEV = (1 << 2),
/* all remaining procedures */
DBG_PROCS = (1 << 3),
- /* buffer alloc info (pc_stack) */
- DBG_PC_STACK = (1 << 4),
};
/* define to see debug info */
@@ -89,13 +87,6 @@
#define IDETAPE_PC_BUFFER_SIZE 256
/*
- * In various places in the driver, we need to allocate storage for packet
- * commands, which will remain valid while we leave the driver to wait for
- * an interrupt or a timeout event.
- */
-#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
-
-/*
* Some drives (for example, Seagate STT3401A Travan) require a very long
* timeout, because they don't return an interrupt or clear their busy bit
* until after the command completes (even retension commands).
@@ -208,13 +199,6 @@
struct kref kref;
/*
- * Since a typical character device operation requires more
- * than one packet command, we provide here enough memory
- * for the maximum of interconnected packet commands.
- * The packet commands are stored in the circular array pc_stack.
- * pc_stack_index points to the last used entry, and warps around
- * to the start when we get to the last array entry.
- *
* pc points to the current processed packet command.
*
* failed_pc points to the last failed packet command, or contains
@@ -226,11 +210,10 @@
struct ide_atapi_pc *pc;
/* Last failed packet command */
struct ide_atapi_pc *failed_pc;
- /* Packet command stack */
- struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK];
- /* Next free packet command storage space */
- int pc_stack_index;
+ /* used by REQ_IDETAPE_{READ,WRITE} requests */
+ struct ide_atapi_pc queued_pc;
+ struct ide_atapi_pc request_sense_pc;
struct request request_sense_rq;
/*
@@ -452,23 +435,6 @@
}
/*
- * idetape_next_pc_storage returns a pointer to a place in which we can
- * safely store a packet command, even though we intend to leave the
- * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
- * commands is allocated at initialization time.
- */
-static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- debug_log(DBG_PC_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
-
- if (tape->pc_stack_index == IDETAPE_PC_STACK)
- tape->pc_stack_index = 0;
- return (&tape->pc_stack[tape->pc_stack_index++]);
-}
-
-/*
* called on each failed packet command retry to analyze the request sense. We
* currently do not utilize this information.
*/
@@ -693,10 +659,9 @@
{
struct ide_tape_obj *tape = drive->driver_data;
struct request *rq = &tape->request_sense_rq;
- struct ide_atapi_pc *pc;
+ struct ide_atapi_pc *pc = &tape->request_sense_pc;
(void)ide_read_error(drive);
- pc = idetape_next_pc_storage(drive);
idetape_create_request_sense_cmd(pc);
set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
idetape_queue_pc_head(drive, pc, rq);
@@ -1006,12 +971,12 @@
return ide_stopped;
}
if (rq->cmd[13] & REQ_IDETAPE_READ) {
- pc = idetape_next_pc_storage(drive);
+ pc = &tape->queued_pc;
ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
goto out;
}
if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
- pc = idetape_next_pc_storage(drive);
+ pc = &tape->queued_pc;
ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
goto out;
}
@@ -2412,7 +2377,6 @@
tape->name[1] = 't';
tape->name[2] = '0' + minor;
tape->chrdev_dir = IDETAPE_DIR_NONE;
- tape->pc = tape->pc_stack;
*((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];