mpt2sas: Kernel Panic during Large Topology discovery

commit 4224489f45b503f0a1f1cf310f76dc108f45689a upstream.

There was a configuration page timing out during the initial port
enable at driver load time. The port enable would fail, and this would
result in the driver unloading itself, meanwhile the driver was accessing
freed memory in another context resulting in the panic.  The fix is to
prevent access to freed memory once the driver had issued the diag reset
which woke up the sleeping port enable process.  The routine
_base_reset_handler was reorganized so the last sleeping process woken up was
the port_enable.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index 21ddd36f9e8b02c529c667af143b5755e71969ec..d6f3ccfe1073074c9eef93083a9f3197dc1c8d4d 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -3693,6 +3693,8 @@ mpt2sas_base_detach(struct MPT2SAS_ADAPTER *ioc)
 static void
 _base_reset_handler(struct MPT2SAS_ADAPTER *ioc, int reset_phase)
 {
+       mpt2sas_scsih_reset_handler(ioc, reset_phase);
+       mpt2sas_ctl_reset_handler(ioc, reset_phase);
        switch (reset_phase) {
        case MPT2_IOC_PRE_RESET:
                dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
@@ -3723,8 +3725,6 @@ _base_reset_handler(struct MPT2SAS_ADAPTER *ioc, int reset_phase)
                    "MPT2_IOC_DONE_RESET\n", ioc->name, __func__));
                break;
        }
-       mpt2sas_scsih_reset_handler(ioc, reset_phase);
-       mpt2sas_ctl_reset_handler(ioc, reset_phase);
 }
 
 /**
@@ -3778,6 +3778,7 @@ mpt2sas_base_hard_reset_handler(struct MPT2SAS_ADAPTER *ioc, int sleep_flag,
 {
        int r;
        unsigned long flags;
+       u8 pe_complete = ioc->wait_for_port_enable_to_complete;
 
        dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: enter\n", ioc->name,
            __func__));
@@ -3802,6 +3803,14 @@ mpt2sas_base_hard_reset_handler(struct MPT2SAS_ADAPTER *ioc, int sleep_flag,
        if (r)
                goto out;
        _base_reset_handler(ioc, MPT2_IOC_AFTER_RESET);
+
+       /* If this hard reset is called while port enable is active, then
+        * there is no reason to call make_ioc_operational
+        */
+       if (pe_complete) {
+               r = -EFAULT;
+               goto out;
+       }
        r = _base_make_ioc_operational(ioc, sleep_flag);
        if (!r)
                _base_reset_handler(ioc, MPT2_IOC_DONE_RESET);