RE: [PATCH] mpt3sas: Fix resume on WarpDrive flash cards

[Chaitra Basappa <chaitra.basappa@broadcom.com>]

Hi,
 Please consider this patch as Acked-by: Chaitra P B
<chaitra.basappa@broadcom.com>

Thanks,
 Chaitra

-----Original Message-----
From: Greg Edwards [mailto:gedwards@fireweed.org]
Sent: Saturday, July 30, 2016 9:36 PM
To: Sathya Prakash; Chaitra P B; Suganath Prabu Subramani; James E.J.
Bottomley; Martin K. Petersen
Cc: MPT-FusionLinux.pdl@broadcom.com; linux-scsi@vger.kernel.org;
linux-kernel@vger.kernel.org; Greg Edwards
Subject: [PATCH] mpt3sas: Fix resume on WarpDrive flash cards

mpt3sas crashes on resume after suspend with WarpDrive flash cards.  The
reply_post_host_index array is not set back up after the resume, and we
deference a stale pointer in _base_interrupt().

[   47.309711] BUG: unable to handle kernel paging request at
ffffc90001f8006c
[   47.318289] IP: [<ffffffffc00863ef>] _base_interrupt+0x49f/0xa30
[mpt3sas]
[   47.326749] PGD 41ccaa067 PUD 41ccab067 PMD 3466c067 PTE 0
[   47.333848] Oops: 0002 [#1] SMP
...
[   47.452708] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.7.0 #6
[   47.460506] Hardware name: Dell Inc. OptiPlex 990/06D7TR, BIOS A18
09/24/2013
[   47.469629] task: ffffffff81c0d500 ti: ffffffff81c00000 task.ti:
ffffffff81c00000
[   47.479112] RIP: 0010:[<ffffffffc00863ef>]  [<ffffffffc00863ef>]
_base_interrupt+0x49f/0xa30 [mpt3sas]
[   47.490466] RSP: 0018:ffff88041d203e30  EFLAGS: 00010002
[   47.497801] RAX: 0000000000000001 RBX: ffff880033f4c000 RCX:
0000000000000001
[   47.506973] RDX: ffffc90001f8006c RSI: 0000000000000082 RDI:
0000000000000082
[   47.516141] RBP: ffff88041d203eb0 R08: ffff8804118e2820 R09:
0000000000000001
[   47.525300] R10: 0000000000000001 R11: 00000000100c0000 R12:
0000000000000000
[   47.534457] R13: ffff880412c487e0 R14: ffff88041a8987d8 R15:
0000000000000001
[   47.543632] FS:  0000000000000000(0000) GS:ffff88041d200000(0000)
knlGS:0000000000000000
[   47.553796] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.561632] CR2: ffffc90001f8006c CR3: 0000000001c06000 CR4:
00000000000406f0
[   47.570883] Stack:
[   47.575015]  000000001d211228 ffff88041d2100c0 ffff8800c47d8130
0000000000000100
[   47.584625]  ffff8804100c0000 100c000000000000 ffff88041a8992a0
ffff88041a8987f8
[   47.594230]  ffff88041d203e00 ffffffff81111e55 000000000000038c
ffff880414ad4280
[   47.603862] Call Trace:
[   47.608474]  <IRQ>
[   47.610413]  [<ffffffff81111e55>] ? call_timer_fn+0x35/0x120
[   47.620539]  [<ffffffff81100a1f>] handle_irq_event_percpu+0x7f/0x1c0
[   47.629061]  [<ffffffff81100b8c>] handle_irq_event+0x2c/0x50
[   47.636859]  [<ffffffff81103fff>] handle_edge_irq+0x6f/0x130
[   47.644654]  [<ffffffff8102fbf3>] handle_irq+0x73/0x120
[   47.652011]  [<ffffffff810c6ada>] ?
atomic_notifier_call_chain+0x1a/0x20
[   47.660854]  [<ffffffff817e374b>] do_IRQ+0x4b/0xd0
[   47.667777]  [<ffffffff817e160c>] common_interrupt+0x8c/0x8c
[   47.675635]  <EOI>

Move the reply_post_host_index array setup into
mpt3sas_base_map_resources(), which is also in the resume path.

Cc: stable@vger.kernel.org
Signed-off-by: Greg Edwards <gedwards@fireweed.org>
---
 drivers/scsi/mpt3sas/mpt3sas_base.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c
b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 751f13e..750f82c 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -2188,6 +2188,17 @@ mpt3sas_base_map_resources(struct MPT3SAS_ADAPTER
*ioc)
 	} else
 		ioc->msix96_vector = 0;

+	if (ioc->is_warpdrive) {
+		ioc->reply_post_host_index[0] = (resource_size_t __iomem
*)
+		    &ioc->chip->ReplyPostHostIndex;
+
+		for (i = 1; i < ioc->cpu_msix_table_sz; i++)
+			ioc->reply_post_host_index[i] =
+			(resource_size_t __iomem *)
+			((u8 __iomem *)&ioc->chip->Doorbell + (0x4000 +
((i - 1)
+			* 4)));
+	}
+
 	list_for_each_entry(reply_q, &ioc->reply_queue_list, list)
 		pr_info(MPT3SAS_FMT "%s: IRQ %d\n",
 		    reply_q->name,  ((ioc->msix_enable) ? "PCI-MSI-X
enabled" :
@@ -5280,17 +5291,6 @@ mpt3sas_base_attach(struct MPT3SAS_ADAPTER *ioc)
 	if (r)
 		goto out_free_resources;

-	if (ioc->is_warpdrive) {
-		ioc->reply_post_host_index[0] = (resource_size_t __iomem
*)
-		    &ioc->chip->ReplyPostHostIndex;
-
-		for (i = 1; i < ioc->cpu_msix_table_sz; i++)
-			ioc->reply_post_host_index[i] =
-			(resource_size_t __iomem *)
-			((u8 __iomem *)&ioc->chip->Doorbell + (0x4000 +
((i - 1)
-			* 4)));
-	}
-
 	pci_set_drvdata(ioc->pdev, ioc->shost);
 	r = _base_get_ioc_facts(ioc, CAN_SLEEP);
 	if (r)
--
2.7.4