diff options
Diffstat (limited to 'drivers/ide/ide-tape.c')
| -rw-r--r-- | drivers/ide/ide-tape.c | 68 |
1 files changed, 12 insertions, 56 deletions
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c index 83014abf330f..dd3533505e3b 100644 --- a/drivers/ide/ide-tape.c +++ b/drivers/ide/ide-tape.c @@ -56,8 +56,8 @@ enum { DBG_CHRDEV = (1 << 2), /* all remaining procedures */ DBG_PROCS = (1 << 3), - /* buffer alloc info (pc_stack & rq_stack) */ - DBG_PCRQ_STACK = (1 << 4), + /* buffer alloc info (pc_stack) */ + DBG_PC_STACK = (1 << 4), }; /* define to see debug info */ @@ -89,9 +89,9 @@ enum { #define IDETAPE_PC_BUFFER_SIZE 256 /* - * In various places in the driver, we need to allocate storage - * for packet commands and requests, which will remain valid while - * we leave the driver to wait for an interrupt or a timeout event. + * 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) @@ -230,9 +230,8 @@ typedef struct ide_tape_obj { struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK]; /* Next free packet command storage space */ int pc_stack_index; - struct request rq_stack[IDETAPE_PC_STACK]; - /* We implement a circular array */ - int rq_stack_index; + + struct request request_sense_rq; /* * DSC polling variables. @@ -462,7 +461,7 @@ static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; - debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); + 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; @@ -470,30 +469,6 @@ static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive) } /* - * idetape_next_rq_storage is used along with idetape_next_pc_storage. - * Since we queue packet commands in the request queue, we need to - * allocate a request, along with the allocation of a packet command. - */ - -/************************************************************** - * * - * This should get fixed to use kmalloc(.., GFP_ATOMIC) * - * followed later on by kfree(). -ml * - * * - **************************************************************/ - -static struct request *idetape_next_rq_storage(ide_drive_t *drive) -{ - idetape_tape_t *tape = drive->driver_data; - - debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); - - if (tape->rq_stack_index == IDETAPE_PC_STACK) - tape->rq_stack_index = 0; - return (&tape->rq_stack[tape->rq_stack_index++]); -} - -/* * called on each failed packet command retry to analyze the request sense. We * currently do not utilize this information. */ @@ -692,17 +667,7 @@ static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) /* * Generate a new packet command request in front of the request queue, before * the current request, so that it will be processed immediately, on the next - * pass through the driver. The function below is called from the request - * handling part of the driver (the "bottom" part). Safe storage for the request - * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that. - * - * Memory for those requests is pre-allocated at initialization time, and is - * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for - * the maximum possible number of inter-dependent packet commands. - * - * The higher level of the driver - The ioctl handler and the character device - * handling functions should queue request to the lower level part and wait for - * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail. + * pass through the driver. */ static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, struct request *rq) @@ -726,12 +691,12 @@ static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, */ static void idetape_retry_pc(ide_drive_t *drive) { + struct ide_tape_obj *tape = drive->driver_data; + struct request *rq = &tape->request_sense_rq; struct ide_atapi_pc *pc; - struct request *rq; (void)ide_read_error(drive); pc = idetape_next_pc_storage(drive); - rq = idetape_next_rq_storage(drive); idetape_create_request_sense_cmd(pc); set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); idetape_queue_pc_head(drive, pc, rq); @@ -1247,16 +1212,7 @@ static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) /* * We add a special packet command request to the tail of the request queue, and - * wait for it to be serviced. This is not to be called from within the request - * handling part of the driver! We allocate here data on the stack and it is - * valid until the request is finished. This is not the case for the bottom part - * of the driver, where we are always leaving the functions to wait for an - * interrupt or a timer event. - * - * From the bottom part of the driver, we should allocate safe memory using - * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request - * to the request list without waiting for it to be serviced! In that case, we - * usually use idetape_queue_pc_head(). + * wait for it to be serviced. */ static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) { |