Patch "mpt3sas: Fix resume on WarpDrive flash cards" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

mpt3sas: Fix resume on WarpDrive flash cards

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mpt3sas-fix-resume-on-warpdrive-flash-cards.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Greg Edwards <[email protected]>
Date: Sat, 30 Jul 2016 10:06:26 -0600
Subject: mpt3sas: Fix resume on WarpDrive flash cards

From: Greg Edwards <[email protected]>

commit ce7c6c9e1d997a2670aead3a7b87f4df32c11118 upstream.

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.

---
 drivers/scsi/mpt3sas/mpt3sas_base.c |   22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

@@ -2155,6 +2155,17 @@ mpt3sas_base_map_resources(struct MPT3SA
 	} 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" :

@@ -5201,17 +5212,6 @@ mpt3sas_base_attach(struct MPT3SAS_ADAPT
 	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)

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/mpt3sas-fix-resume-on-warpdrive-flash-cards.patch