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| author | Finn Thain <fthain@telegraphics.com.au> | 2016-02-23 00:07:04 +0100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-03-01 15:37:11 +0100 |
| commit | 1884c2838f31e6bf20f21459ed9921f8c92ed3ef (patch) | |
| tree | 14690ef48d5872a4d4591d1c54287da68960859a /drivers/scsi/NCR5380.c | |
| parent | be2iscsi:Add missing error check in beiscsi_eeh_resume (diff) | |
| download | linux-1884c2838f31e6bf20f21459ed9921f8c92ed3ef.tar.xz linux-1884c2838f31e6bf20f21459ed9921f8c92ed3ef.zip | |
ncr5380: Correctly clear command pointers and lists after bus reset
Commands subject to exception handling are to be returned to the scsi
mid-layer. Make sure that the various command pointers and command lists
in the low-level driver are correctly cleansed of affected commands.
This fixes some bugs that I accidentally introduced in v4.5-rc1 including
the removal of INIT_LIST_HEAD for the 'autosense' and 'disconnected'
command lists, and the possible NULL pointer dereference in
NCR5380_bus_reset() that was reported by Dan Carpenter.
hostdata->sensing may also point to an affected command so this pointer
also has to be cleared. The abort handler calls complete_cmd() to take
care of this; let's have the bus reset handler do the same.
The issue queue may also contain an affected command. If so, remove it.
This also follows the abort handler logic.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 62717f537e1b ("ncr5380: Implement new eh_bus_reset_handler")
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Cc: <stable@vger.kernel.org> # 4.5
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/NCR5380.c')
| -rw-r--r-- | drivers/scsi/NCR5380.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index d72867257346..ce577f413328 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -2450,7 +2450,16 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) * commands! */ - hostdata->selecting = NULL; + if (list_del_cmd(&hostdata->unissued, cmd)) { + cmd->result = DID_RESET << 16; + cmd->scsi_done(cmd); + } + + if (hostdata->selecting) { + hostdata->selecting->result = DID_RESET << 16; + complete_cmd(instance, hostdata->selecting); + hostdata->selecting = NULL; + } list_for_each_entry(ncmd, &hostdata->disconnected, list) { struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); @@ -2458,6 +2467,7 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) set_host_byte(cmd, DID_RESET); cmd->scsi_done(cmd); } + INIT_LIST_HEAD(&hostdata->disconnected); list_for_each_entry(ncmd, &hostdata->autosense, list) { struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); @@ -2465,6 +2475,7 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) set_host_byte(cmd, DID_RESET); cmd->scsi_done(cmd); } + INIT_LIST_HEAD(&hostdata->autosense); if (hostdata->connected) { set_host_byte(hostdata->connected, DID_RESET); @@ -2472,12 +2483,6 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) hostdata->connected = NULL; } - if (hostdata->sensing) { - set_host_byte(hostdata->connected, DID_RESET); - complete_cmd(instance, hostdata->sensing); - hostdata->sensing = NULL; - } - for (i = 0; i < 8; ++i) hostdata->busy[i] = 0; #ifdef REAL_DMA |