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[SCSI] aha152x: Clean Reset path

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What Reset code was doing:  Save command's important/dangerous
Info on stack. NULL those members from scsi_cmnd.
Issue a Reset. wait for it to finish than restore members
and return.

What I do is save or NULL nothing. But use the "resetting"
hint in aha152x_internal_queue() to NULL out working members
and leave struct scsi_cmnd alone.

The indent here looks funny but it will change/drop in last
patch and it is clear this way what changed.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Boaz Harrosh 2007-07-29 22:24:09 +03:00 committed by James Bottomley
parent 0ceb47987d
commit 66acdb0309
1 changed files with 9 additions and 9 deletions
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18
drivers/scsi/aha152x.c
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@ -1022,6 +1022,14 @@ static int aha152x_internal_queue(Scsi_Cmnd *SCpnt, struct completion *complete,
SCp.buffer : next buffer
SCp.buffers_residual : left buffers in list
SCp.phase : current state of the command */
if(phase & resetting) {
SCpnt->SCp.ptr = NULL;
SCpnt->SCp.this_residual = 0;
SCpnt->resid = 0;
SCpnt->SCp.buffer = NULL;
SCpnt->SCp.buffers_residual = 0;
} else {
if (SCpnt->use_sg) {
SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->request_buffer;
SCpnt->SCp.ptr = SG_ADDRESS(SCpnt->SCp.buffer);
@ -1033,6 +1041,7 @@ static int aha152x_internal_queue(Scsi_Cmnd *SCpnt, struct completion *complete,
SCpnt->SCp.buffer = NULL;
SCpnt->SCp.buffers_residual = 0;
}
}
DO_LOCK(flags);
@ -1150,9 +1159,6 @@ static int aha152x_device_reset(Scsi_Cmnd * SCpnt)
DECLARE_COMPLETION(done);
int ret, issued, disconnected;
unsigned char old_cmd_len = SCpnt->cmd_len;
unsigned short old_use_sg = SCpnt->use_sg;
void *old_buffer = SCpnt->request_buffer;
unsigned old_bufflen = SCpnt->request_bufflen;
unsigned long flags;
unsigned long timeleft;
@ -1174,9 +1180,6 @@ static int aha152x_device_reset(Scsi_Cmnd * SCpnt)
DO_UNLOCK(flags);
SCpnt->cmd_len = 0;
SCpnt->use_sg = 0;
SCpnt->request_buffer = NULL;
SCpnt->request_bufflen = 0;
aha152x_internal_queue(SCpnt, &done, resetting, reset_done);
@ -1189,9 +1192,6 @@ static int aha152x_device_reset(Scsi_Cmnd * SCpnt)
}
SCpnt->cmd_len = old_cmd_len;
SCpnt->use_sg = old_use_sg;
SCpnt->request_buffer = old_buffer;
SCpnt->request_bufflen = old_bufflen;
DO_LOCK(flags);