4.4-stable review patch. If anyone has any objections, please let me know.
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From: Mauricio Faria de Oliveira mauricfo@linux.vnet.ibm.com
commit 04dfaa53a0b6e66b328a5bc549e3af8f8b6eac02 upstream.
When the driver is unloading, in qla2x00_remove_one(), there is a single call/point in time to abort ongoing commands, qla2x00_abort_all_cmds(), which is still several steps away from the call to scsi_remove_host().
If more commands continue to arrive and be processed during that interval, when the driver is tearing down and releasing its structures, it might potentially hit an oops due to invalid memory access:
Unable to handle kernel paging request for data at address 0x00000138 <...> NIP [d000000004700a40] qla2xxx_queuecommand+0x80/0x3f0 [qla2xxx] LR [d000000004700a10] qla2xxx_queuecommand+0x50/0x3f0 [qla2xxx]
So, fail commands in qla2xxx_queuecommand() if the UNLOADING bit is set.
Signed-off-by: Mauricio Faria de Oliveira mauricfo@linux.vnet.ibm.com Acked-by: Himanshu Madhani himanshu.madhani@cavium.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Amit Pundir amit.pundir@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/scsi/qla2xxx/qla_os.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -685,6 +685,11 @@ qla2xxx_queuecommand(struct Scsi_Host *h srb_t *sp; int rval;
+ if (unlikely(test_bit(UNLOADING, &base_vha->dpc_flags))) { + cmd->result = DID_NO_CONNECT << 16; + goto qc24_fail_command; + } + if (ha->flags.eeh_busy) { if (ha->flags.pci_channel_io_perm_failure) { ql_dbg(ql_dbg_aer, vha, 0x9010,