[PATCH 2/2] ide-scsi: do non-atomic pc->flags testing

From: Borislav Petkov
Date: Wed Feb 13 2008 - 11:24:40 EST


Signed-off-by: Borislav Petkov <petkovbb@xxxxxxxxx>
---
drivers/scsi/ide-scsi.c | 27 ++++++++++++++-------------
1 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index d46c81c..93c3fc2 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -311,10 +311,10 @@ static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
pc = opc;
rq = pc->rq;
pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
- ((test_bit(PC_FLAG_TIMEDOUT, &pc->flags) ?
+ (((pc->flags & PC_FLAG_TIMEDOUT) ?
DID_TIME_OUT :
DID_OK) << 16);
- } else if (test_bit(PC_FLAG_TIMEDOUT, &pc->flags)) {
+ } else if (pc->flags & PC_FLAG_TIMEDOUT) {
if (log)
printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
drive->name, pc->scsi_cmd->serial_number);
@@ -356,7 +356,7 @@ static int idescsi_expiry(ide_drive_t *drive)
#if IDESCSI_DEBUG_LOG
printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
#endif
- set_bit(PC_FLAG_TIMEDOUT, &pc->flags);
+ pc->flags |= PC_FLAG_TIMEDOUT;

return 0; /* we do not want the ide subsystem to retry */
}
@@ -378,7 +378,7 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
#endif /* IDESCSI_DEBUG_LOG */

- if (test_bit(PC_FLAG_TIMEDOUT, &pc->flags)) {
+ if (pc->flags & PC_FLAG_TIMEDOUT) {
#if IDESCSI_DEBUG_LOG
printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
pc->scsi_cmd->serial_number, jiffies);
@@ -387,7 +387,8 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
idescsi_end_request (drive, 1, 0);
return ide_stopped;
}
- if (test_and_clear_bit(PC_FLAG_DMA_IN_PROGRESS, &pc->flags)) {
+ if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
+ pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
#if IDESCSI_DEBUG_LOG
printk ("ide-scsi: %s: DMA complete\n", drive->name);
#endif /* IDESCSI_DEBUG_LOG */
@@ -426,7 +427,7 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
"- discarding data\n");
temp = pc->buf_size - pc->xferred;
if (temp) {
- clear_bit(PC_FLAG_WRITING, &pc->flags);
+ pc->flags &= ~PC_FLAG_WRITING;
if (pc->sg)
idescsi_input_buffers(drive, pc,
temp);
@@ -448,14 +449,14 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
}
}
if (ireason & IO) {
- clear_bit(PC_FLAG_WRITING, &pc->flags);
+ pc->flags &= ~PC_FLAG_WRITING;
if (pc->sg)
idescsi_input_buffers(drive, pc, bcount);
else
hwif->atapi_input_bytes(drive, pc->cur_pos,
bcount);
} else {
- set_bit(PC_FLAG_WRITING, &pc->flags);
+ pc->flags |= PC_FLAG_WRITING;
if (pc->sg)
idescsi_output_buffers(drive, pc, bcount);
else
@@ -495,8 +496,8 @@ static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
/* Send the actual packet */
drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
- if (test_bit(PC_FLAG_DMA_OK, &pc->flags)) {
- set_bit(PC_FLAG_DMA_IN_PROGRESS, &pc->flags);
+ if (pc->flags & PC_FLAG_DMA_OK) {
+ pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
hwif->dma_start(drive);
}
return ide_started;
@@ -506,10 +507,10 @@ static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
{
switch (pc->c[0]) {
case READ_6: case READ_10: case READ_12:
- clear_bit(PC_FLAG_WRITING, &pc->flags);
+ pc->flags &= ~PC_FLAG_WRITING;
return 0;
case WRITE_6: case WRITE_10: case WRITE_12:
- set_bit(PC_FLAG_WRITING, &pc->flags);
+ pc->flags |= PC_FLAG_WRITING;
return 0;
default:
return 1;
@@ -566,7 +567,7 @@ static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);

if (dma)
- set_bit(PC_FLAG_DMA_OK, &pc->flags);
+ pc->flags |= PC_FLAG_DMA_OK;

if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
--
1.5.3.7

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/