[PATCH] fix scsi_send_eh_cmnd regression

Mike Christie
2006-08-26T08:00:23Z

The callers of scsi_send_eh_cmnd are setting the cmnd buffer,
and then scsi_send_eh_cmnd is copying that updated buffer to
the old_cmnd variable. Then after the command runs, we end up
copying that old_cmnd var which has the new cmnd to the scsi
command buffer. When this command gets recent, all types of fun
things happen like getting TUR or START_STOP commands with
data and scatterlists.

This patch made against scsi-rc-fixes, has the callers of
scsi_send_eh_cmnd pass in the command so scsi_send_eh_cmnd
can do the right thing. This should go into 2.6.18 since this
fixes a regression added when we removed some of the scsi_cmnd
fields and replaced them with local variables.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 6a5b731..a8ed5a2 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -460,7 +460,8 @@ static void scsi_eh_done(struct scsi_cmn
* Return value:
* SUCCESS or FAILED or NEEDS_RETRY
**/
-static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, int timeout, int copy_sense)
+static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
+ int cmnd_size, int timeout, int copy_sense)
{
struct scsi_device *sdev = scmd->device;
struct Scsi_Host *shost = sdev->host;
@@ -490,6 +491,9 @@ static int scsi_send_eh_cmnd(struct scsi
old_cmd_len = scmd->cmd_len;
old_use_sg = scmd->use_sg;

+ memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
+ memcpy(scmd->cmnd, cmnd, cmnd_size);
+
if (copy_sense) {
int gfp_mask = GFP_ATOMIC;

@@ -610,8 +614,7 @@ static int scsi_request_sense(struct scs
static unsigned char generic_sense[6] =
{REQUEST_SENSE, 0, 0, 0, 252, 0};

- memcpy(scmd->cmnd, generic_sense, sizeof(generic_sense));
- return scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT, 1);
+ return scsi_send_eh_cmnd(scmd, generic_sense, 6, SENSE_TIMEOUT, 1);
}

/**
@@ -736,10 +739,7 @@ static int scsi_eh_tur(struct scsi_cmnd
int retry_cnt = 1, rtn;

retry_tur:
- memcpy(scmd->cmnd, tur_command, sizeof(tur_command));
-
-
- rtn = scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT, 0);
+ rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0);

SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
__FUNCTION__, scmd, rtn));
@@ -839,8 +839,8 @@ static int scsi_eh_try_stu(struct scsi_c
if (scmd->device->allow_restart) {
int rtn;

- memcpy(scmd->cmnd, stu_command, sizeof(stu_command));
- rtn = scsi_send_eh_cmnd(scmd, START_UNIT_TIMEOUT, 0);
+ rtn = scsi_send_eh_cmnd(scmd, stu_command, 6,
+ START_UNIT_TIMEOUT, 0);
if (rtn == SUCCESS)
return 0;
}