From c47386bdb907e89956994212ea1190e117d5cbbf Mon Sep 17 00:00:00 2001 From: Mauricio Faria de Oliveira Date: Mon, 7 Nov 2016 17:53:30 -0200 Subject: [PATCH] scsi: qla2xxx: do not queue commands when unloading 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 Acked-by: Himanshu Madhani Signed-off-by: Martin K. Petersen Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/qla2xxx/qla_os.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index 7bc28c8..4bd4f18 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -687,6 +687,11 @@ qla2xxx_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) 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, -- 2.7.4