[PATCH] gdth: Stop abusing ->done for internal commands

Matthew Wilcox
2007-09-25T16:42:07Z

From: Matthew Wilcox <matthew@wil.cx>

The ->done member was being used to mark commands as being internal.
I decided to put a magic number in ->underflow instead. I believe this
to be safe as no current user of ->underflow has any of the bottom 9
bits set.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
---
drivers/scsi/gdth.c | 19 +++++++++++--------
drivers/scsi/gdth_proc.c | 4 ++--
2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 8a6a5f8..42a200f 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -691,6 +691,9 @@ static const struct file_operations gdth_fops = {
.release = gdth_close,
};

+#define GDTH_MAGIC 0xc2e7c389 /* I got it from /dev/urandom */
+#define IS_GDTH_INTERNAL_CMD(scp) (scp->underflow == GDTH_MAGIC)
+
#include "gdth_proc.h"
#include "gdth_proc.c"

@@ -713,7 +716,7 @@ static void gdth_scsi_done(struct scsi_cmnd *scp)
{
TRACE2(("gdth_scsi_done()\n"));

- if (scp->done == gdth_scsi_done)
+ if (IS_GDTH_INTERNAL_CMD(scp))
complete((struct completion *)scp->request);
else
scp->scsi_done(scp);
@@ -738,7 +741,7 @@ int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd,
scp->cmd_len = 12;
memcpy(scp->cmnd, cmnd, 12);
scp->SCp.this_residual = IOCTL_PRI; /* priority */
- scp->done = gdth_scsi_done;
+ scp->underflow = GDTH_MAGIC;
gdth_queuecommand(scp, NULL);
wait_for_completion(&wait);

@@ -2319,7 +2322,7 @@ static void gdth_putq(int hanum,Scsi_Cmnd *scp,unchar priority)
ha = HADATA(gdth_ctr_tab[hanum]);
spin_lock_irqsave(&ha->smp_lock, flags);

- if (scp->done != gdth_scsi_done) {
+ if (!IS_GDTH_INTERNAL_CMD(scp)) {
scp->SCp.this_residual = (int)priority;
b = virt_ctr ? NUMDATA(scp->device->host)->busnum:scp->device->channel;
t = scp->device->id;
@@ -2382,7 +2385,7 @@ static void gdth_next(int hanum)
for (nscp = pscp = ha->req_first; nscp; nscp = (Scsi_Cmnd *)nscp->SCp.ptr) {
if (nscp != pscp && nscp != (Scsi_Cmnd *)pscp->SCp.ptr)
pscp = (Scsi_Cmnd *)pscp->SCp.ptr;
- if (nscp->done != gdth_scsi_done) {
+ if (!IS_GDTH_INTERNAL_CMD(nscp)) {
b = virt_ctr ?
NUMDATA(nscp->device->host)->busnum : nscp->device->channel;
t = nscp->device->id;
@@ -2408,7 +2411,7 @@ static void gdth_next(int hanum)
firsttime = FALSE;
}

- if (nscp->done != gdth_scsi_done) {
+ if (!IS_GDTH_INTERNAL_CMD(nscp)) {
if (nscp->SCp.phase == -1) {
nscp->SCp.phase = CACHESERVICE; /* default: cache svc. */
if (nscp->cmnd[0] == TEST_UNIT_READY) {
@@ -2471,7 +2474,7 @@ static void gdth_next(int hanum)
else
gdth_scsi_done(nscp);
}
- } else if (nscp->done == gdth_scsi_done) {
+ } else if (IS_GDTH_INTERNAL_CMD(nscp)) {
if (!(cmd_index=gdth_special_cmd(hanum,nscp)))
this_cmd = FALSE;
next_cmd = FALSE;
@@ -3812,7 +3815,7 @@ static int gdth_sync_event(int hanum,int service,unchar index,Scsi_Cmnd *scp)
scp->sense_buffer[2] = NOT_READY;
scp->result = (DID_OK << 16) | (CHECK_CONDITION << 1);
}
- if (scp->done != gdth_scsi_done) {
+ if (!IS_GDTH_INTERNAL_CMD(scp)) {
ha->dvr.size = sizeof(ha->dvr.eu.sync);
ha->dvr.eu.sync.ionode = hanum;
ha->dvr.eu.sync.service = service;
@@ -4910,7 +4913,7 @@ static int gdth_queuecommand(struct scsi_cmnd *scp,
#endif

priority = DEFAULT_PRI;
- if (scp->done == gdth_scsi_done)
+ if (IS_GDTH_INTERNAL_CMD(scp))
priority = scp->SCp.this_residual;
else
gdth_update_timeout(hanum, scp, scp->timeout_per_command * 6);
diff --git a/drivers/scsi/gdth_proc.c b/drivers/scsi/gdth_proc.c
index 32982eb..1f8d9a5 100644
--- a/drivers/scsi/gdth_proc.c
+++ b/drivers/scsi/gdth_proc.c
@@ -805,7 +805,7 @@ static void gdth_stop_timeout(int hanum, int busnum, int id)
spin_lock_irqsave(&ha->smp_lock, flags);

for (scp = ha->req_first; scp; scp = (Scsi_Cmnd *)scp->SCp.ptr) {
- if (scp->done != gdth_scsi_done) {
+ if (!IS_GDTH_INTERNAL_CMD(scp)) {
b = virt_ctr ?
NUMDATA(scp->device->host)->busnum : scp->device->channel;
t = scp->device->id;
@@ -829,7 +829,7 @@ static void gdth_start_timeout(int hanum, int busnum, int id)
spin_lock_irqsave(&ha->smp_lock, flags);

for (scp = ha->req_first; scp; scp = (Scsi_Cmnd *)scp->SCp.ptr) {
- if (scp->done != gdth_scsi_done) {
+ if (!IS_GDTH_INTERNAL_CMD(scp)) {
b = virt_ctr ?
NUMDATA(scp->device->host)->busnum : scp->device->channel;
t = scp->device->id;
--
1.5.3.1