05_ide_ATA_TFLAG_IO_16BIT.patch
In ide_taskfile_ioctl(), there was a race condition involving
drive->io_32bit. It was cleared and restored during ioctl
requests but there was no synchronization with other requests.
So, other requests could execute with the altered io_32bit
setting or updated drive->io_32bit could be overwritten by
ide_taskfile_ioctl().
This patch adds ATA_TFLAG_IO_16BIT flag to indicate to
ide_pio_datablock() that 16bit IO is needed regardless of
drive->io_32bit settting.
Signed-off-by: Tejun Heo <[EMAIL PROTECTED]>
drivers/ide/ide-taskfile.c | 14 ++++++++++----
include/linux/ata.h | 1 +
2 files changed, 11 insertions(+), 4 deletions(-)
Index: linux-ide/drivers/ide/ide-taskfile.c
===================================================================
--- linux-ide.orig/drivers/ide/ide-taskfile.c 2005-02-10 17:38:01.172900876
+0900
+++ linux-ide/drivers/ide/ide-taskfile.c 2005-02-10 17:38:01.539839336
+0900
@@ -315,8 +315,15 @@ static void ide_pio_multi(ide_drive_t *d
static inline void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
unsigned int write)
{
+ int saved_io_32bit = drive->io_32bit;
+
if (rq->bio) /* fs request */
rq->errors = 0;
+ if (rq->flags & REQ_DRIVE_TASKFILE) {
+ ide_task_t *task = rq->special;
+ if (task->flags & ATA_TFLAG_IO_16BIT)
+ drive->io_32bit = 0;
+ }
switch (drive->hwif->data_phase) {
case TASKFILE_MULTI_IN:
@@ -327,6 +334,8 @@ static inline void ide_pio_datablock(ide
ide_pio_sector(drive, write);
break;
}
+
+ drive->io_32bit = saved_io_32bit;
}
static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
@@ -520,7 +529,6 @@ int ide_taskfile_ioctl (ide_drive_t *dri
int tasksize = sizeof(struct ide_task_request_s);
int taskin = 0;
int taskout = 0;
- u8 io_32bit = drive->io_32bit;
char __user *buf = (char __user *)arg;
// printk("IDE Taskfile ...\n");
@@ -573,10 +581,10 @@ int ide_taskfile_ioctl (ide_drive_t *dri
args.data_phase = req_task->data_phase;
args.command_type = req_task->req_cmd;
+ args.flags = ATA_TFLAG_IO_16BIT;
if (drive->addressing == 1)
args.flags |= ATA_TFLAG_LBA48;
- drive->io_32bit = 0;
switch(req_task->data_phase) {
case TASKFILE_OUT_DMAQ:
case TASKFILE_OUT_DMA:
@@ -656,8 +664,6 @@ abort:
// printk("IDE Taskfile ioctl ended. rc = %i\n", err);
- drive->io_32bit = io_32bit;
-
return err;
}
Index: linux-ide/include/linux/ata.h
===================================================================
--- linux-ide.orig/include/linux/ata.h 2005-02-10 17:31:48.610711131 +0900
+++ linux-ide/include/linux/ata.h 2005-02-10 17:38:01.540839168 +0900
@@ -174,6 +174,7 @@ enum {
ATA_TFLAG_ISADDR = (1 << 1), /* enable r/w to nsect/lba regs */
ATA_TFLAG_DEVICE = (1 << 2), /* enable r/w to device reg */
ATA_TFLAG_WRITE = (1 << 3), /* data dir: host->dev==1 (write) */
+ ATA_TFLAG_IO_16BIT = (1 << 4), /* force 16bit pio */
};
enum ata_tf_protocols {
-
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