linux-kernel - [PATCH] scsi: smartpqi: call pqi_free_interrupts() in pqi

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Date:   Thu, 20 Dec 2018 16:32:35 +0800
From:   Yanjiang Jin <yanjiang.jin@...-semitech.com>
To:     <don.brace@...rosemi.com>, <jejb@...ux.vnet.ibm.com>,
        <martin.petersen@...cle.com>, <yanjiang.jin@...-semitech.com>
CC:     <yu.zheng@...-semitech.com>, <jinyanjiang@...il.com>,
        <esc.storagedev@...rosemi.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] scsi: smartpqi: call pqi_free_interrupts() in pqi_shutdown()

We must free all irqs during shutdown, else kexec's 2nd kernel would hang
in pqi_wait_for_completion_io() as below:

Call trace:

 pqi_wait_for_completion_io
 pqi_submit_raid_request_synchronous.constprop.78+0x23c/0x310 [smartpqi]
 pqi_configure_events+0xec/0x1f8 [smartpqi]
 pqi_ctrl_init+0x814/0xca0 [smartpqi]
 pqi_pci_probe+0x400/0x46c [smartpqi]
 local_pci_probe+0x48/0xb0
 pci_device_probe+0x14c/0x1b0
 really_probe+0x218/0x3fc
 driver_probe_device+0x70/0x140
 __driver_attach+0x11c/0x134
 bus_for_each_dev+0x70/0xc8
 driver_attach+0x30/0x38
 bus_add_driver+0x1f0/0x294
 driver_register+0x74/0x12c
 __pci_register_driver+0x64/0x70
 pqi_init+0xd0/0x10000 [smartpqi]
 do_one_initcall+0x60/0x1d8
 do_init_module+0x64/0x1f8
 load_module+0x10ec/0x1350
 __se_sys_finit_module+0xd4/0x100
 __arm64_sys_finit_module+0x28/0x34
 el0_svc_handler+0x104/0x160
 el0_svc+0x8/0xc

This happens only in the following combinations:

1. smartpqi is built as module, not built-in;
2. We have a disk connected to smartpqi card;
3. Both kexec's 1st and 2nd kernels use this disk as Rootfs' mount point.

Signed-off-by: Yanjiang Jin <yanjiang.jin@...-semitech.com>
---
 drivers/scsi/smartpqi/smartpqi_init.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index a25a07a..55c1d82 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -6670,6 +6670,7 @@ static void pqi_shutdown(struct pci_dev *pci_dev)
         * storage.
         */
        rc = pqi_flush_cache(ctrl_info, SHUTDOWN);
+       pqi_free_interrupts(ctrl_info);
        pqi_reset(ctrl_info);
        if (rc == 0)
                return;
--
1.8.3.1

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