From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Changhui Zhong <czhong@redhat.com>,
Yi Zhang <yi.zhang@redhat.com>, Ming Lei <ming.lei@redhat.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>
Subject: [PATCH 5.10 01/16] scsi: core: Put LLD module refcnt after SCSI device is released
Date: Thu, 4 Nov 2021 15:12:40 +0100 [thread overview]
Message-ID: <20211104141159.613774631@linuxfoundation.org> (raw)
In-Reply-To: <20211104141159.561284732@linuxfoundation.org>
From: Ming Lei <ming.lei@redhat.com>
commit f2b85040acec9a928b4eb1b57a989324e8e38d3f upstream.
SCSI host release is triggered when SCSI device is freed. We have to make
sure that the low-level device driver module won't be unloaded before SCSI
host instance is released because shost->hostt is required in the release
handler.
Make sure to put LLD module refcnt after SCSI device is released.
Fixes a kernel panic of 'BUG: unable to handle page fault for address'
reported by Changhui and Yi.
Link: https://lore.kernel.org/r/20211008050118.1440686-1-ming.lei@redhat.com
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reported-by: Changhui Zhong <czhong@redhat.com>
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Tested-by: Yi Zhang <yi.zhang@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/scsi/scsi.c | 4 +++-
drivers/scsi/scsi_sysfs.c | 9 +++++++++
2 files changed, 12 insertions(+), 1 deletion(-)
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -545,8 +545,10 @@ EXPORT_SYMBOL(scsi_device_get);
*/
void scsi_device_put(struct scsi_device *sdev)
{
- module_put(sdev->host->hostt->module);
+ struct module *mod = sdev->host->hostt->module;
+
put_device(&sdev->sdev_gendev);
+ module_put(mod);
}
EXPORT_SYMBOL(scsi_device_put);
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -450,9 +450,12 @@ static void scsi_device_dev_release_user
struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
unsigned long flags;
+ struct module *mod;
sdev = container_of(work, struct scsi_device, ew.work);
+ mod = sdev->host->hostt->module;
+
scsi_dh_release_device(sdev);
parent = sdev->sdev_gendev.parent;
@@ -501,11 +504,17 @@ static void scsi_device_dev_release_user
if (parent)
put_device(parent);
+ module_put(mod);
}
static void scsi_device_dev_release(struct device *dev)
{
struct scsi_device *sdp = to_scsi_device(dev);
+
+ /* Set module pointer as NULL in case of module unloading */
+ if (!try_module_get(sdp->host->hostt->module))
+ sdp->host->hostt->module = NULL;
+
execute_in_process_context(scsi_device_dev_release_usercontext,
&sdp->ew);
}
next prev parent reply other threads:[~2021-11-04 14:15 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-04 14:12 [PATCH 5.10 00/16] 5.10.78-rc1 review Greg Kroah-Hartman
2021-11-04 14:12 ` Greg Kroah-Hartman [this message]
2021-11-04 14:12 ` [PATCH 5.10 02/16] Revert "io_uring: reinforce cancel on flush during exit" Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 03/16] sfc: Fix reading non-legacy supported link modes Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 04/16] vrf: Revert "Reset skb conntrack connection..." Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 05/16] net: ethernet: microchip: lan743x: Fix skb allocation failure Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 06/16] mm: hwpoison: remove the unnecessary THP check Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 07/16] mm: filemap: check if THP has hwpoisoned subpage for PMD page fault Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 08/16] media: firewire: firedtv-avc: fix a buffer overflow in avc_ca_pmt() Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 09/16] Revert "xhci: Set HCD flag to defer primary roothub registration" Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 10/16] Revert "usb: core: hcd: Add support for deferring " Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 11/16] mm: khugepaged: skip huge page collapse for special files Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 12/16] Revert "drm/ttm: fix memleak in ttm_transfered_destroy" Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 13/16] ARM: 9120/1: Revert "amba: make use of -1 IRQs warn" Greg Kroah-Hartman
2021-11-05 13:32 ` Pavel Machek
2021-11-04 14:12 ` [PATCH 5.10 14/16] Revert "wcn36xx: Disable bmps when encryption is disabled" Greg Kroah-Hartman
2021-11-05 13:18 ` Pavel Machek
2021-11-05 14:06 ` Bryan O'Donoghue
2021-11-04 14:12 ` [PATCH 5.10 15/16] ALSA: usb-audio: Add Schiit Hel device to mixer map quirk table Greg Kroah-Hartman
2021-11-04 14:12 ` [PATCH 5.10 16/16] ALSA: usb-audio: Add Audient iD14 " Greg Kroah-Hartman
2021-11-04 15:53 ` [PATCH 5.10 00/16] 5.10.78-rc1 review Daniel Díaz
2021-11-04 16:20 ` Greg Kroah-Hartman
2021-11-04 16:45 ` Daniel Díaz
2021-11-04 16:46 ` Guenter Roeck
2021-11-04 16:52 ` Greg Kroah-Hartman
2021-11-04 18:38 ` Fox Chen
2021-11-04 23:48 ` Shuah Khan
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