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scsi: core: Release SCSI devices synchronously

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All upstream scsi_device_put() calls happen from thread context. Hence
simplify scsi_device_put() by always calling the release function
synchronously. This commit prepares for constifying the SCSI host template
by removing an assignment that clears the module pointer in the SCSI host
template.

scsi_device_dev_release_usercontext() was introduced in 2006 via
commit 65110b2168 ("[SCSI] fix wrong context bugs in SCSI").

Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: John Garry <john.garry@huawei.com>
Cc: Mike Christie <michael.christie@oracle.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20221015002418.30955-9-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2022-10-14 17:24:18 -07:00 committed by Martin K. Petersen
parent 195fae206e
commit f93ed747e2
3 changed files with 4 additions and 21 deletions
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2
drivers/scsi/scsi.c
View file

@ -588,6 +588,8 @@ void scsi_device_put(struct scsi_device *sdev)
{
struct module *mod = sdev->host->hostt->module;
might_sleep();
put_device(&sdev->sdev_gendev);
module_put(mod);
}

22
drivers/scsi/scsi_sysfs.c
View file

@ -441,20 +441,15 @@ static void scsi_device_cls_release(struct device *class_dev)
put_device(&sdev->sdev_gendev);
}
static void scsi_device_dev_release_usercontext(struct work_struct *work)
static void scsi_device_dev_release(struct device *dev)
{
struct scsi_device *sdev;
struct scsi_device *sdev = to_scsi_device(dev);
struct device *parent;
struct list_head *this, *tmp;
struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = 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);
@ -518,19 +513,6 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
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);
}
static struct class sdev_class = {

1
include/scsi/scsi_device.h
View file

@ -236,7 +236,6 @@ struct scsi_device {
struct device sdev_gendev,
sdev_dev;
struct execute_work ew; /* used to get process context on put */
struct work_struct requeue_work;
struct scsi_device_handler *handler;