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Subject[PATCH] ide-scsi: do non-atomic pc->flags testing
From
commit 272976f0f5754707f9e41da315717a6eb8d9d536
Author: Borislav Petkov <petkovbb@gmail.com>
Date: Tue Feb 12 16:22:44 2008 +0100

ide-scsi: do non-atomic pc->flags testing

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>

diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 5ec421c..eb84cdc 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -319,8 +319,10 @@ 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_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
- } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
+ (((pc->flags & PC_TIMEDOUT) ?
+ DID_TIME_OUT :
+ DID_OK) << 16);
+ } else if (pc->flags & PC_TIMEDOUT) {
if (log)
printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
drive->name, pc->scsi_cmd->serial_number);
@@ -362,7 +364,7 @@ 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_TIMEDOUT, &pc->flags);
+ pc->flags |= PC_TIMEDOUT;

return 0; /* we do not want the ide subsystem to retry */
}
@@ -384,7 +386,7 @@ 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_TIMEDOUT, &pc->flags)){
+ if (pc->flags & PC_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);
@@ -393,7 +395,8 @@ 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_DMA_IN_PROGRESS, &pc->flags)) {
+ if (pc->flags & PC_DMA_IN_PROGRESS) {
+ pc->flags &= ~PC_DMA_IN_PROGRESS;
#if IDESCSI_DEBUG_LOG
printk ("ide-scsi: %s: DMA complete\n", drive->name);
#endif /* IDESCSI_DEBUG_LOG */
@@ -432,7 +435,7 @@ 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_WRITING, &pc->flags);
+ pc->flags &= ~PC_WRITING;
if (pc->sg)
idescsi_input_buffers(drive, pc,
temp);
@@ -454,14 +457,14 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
}
}
if (ireason & IO) {
- clear_bit(PC_WRITING, &pc->flags);
+ pc->flags &= ~PC_WRITING;
if (pc->sg)
idescsi_input_buffers(drive, pc, bcount);
else
hwif->atapi_input_bytes(drive, pc->cur_pos,
bcount);
} else {
- set_bit(PC_WRITING, &pc->flags);
+ pc->flags |= PC_WRITING;
if (pc->sg)
idescsi_output_buffers(drive, pc, bcount);
else
@@ -501,8 +504,8 @@ 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_DMA_OK, &pc->flags)) {
- set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
+ if (pc->flags & PC_DMA_OK) {
+ pc->flags |= PC_DMA_IN_PROGRESS;
hwif->dma_start(drive);
}
return ide_started;
@@ -512,10 +515,10 @@ 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_WRITING, &pc->flags);
+ pc->flags &= ~PC_WRITING;
return 0;
case WRITE_6: case WRITE_10: case WRITE_12:
- set_bit(PC_WRITING, &pc->flags);
+ pc->flags |= PC_WRITING;
return 0;
default:
return 1;
@@ -572,7 +575,7 @@ 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_DMA_OK, &pc->flags);
+ pc->flags |= PC_DMA_OK;

if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
--
Regards/Gruß,
Boris.
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