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authorMing Lei <ming.lei@redhat.com>2022-07-29 00:18:50 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2022-08-02 01:45:14 +0200
commit1a9283782df2c91c7db5656753a2f548c43de6a7 (patch)
tree301dd913aa26436ad5699d90aaeca0b4d43fda35
parentscsi: core: Make sure that hosts outlive targets (diff)
downloadlinux-1a9283782df2c91c7db5656753a2f548c43de6a7.tar.xz
linux-1a9283782df2c91c7db5656753a2f548c43de6a7.zip
scsi: core: Simplify LLD module reference counting
Swap two statements in scsi_device_put() now that it is guaranteed that SCSI hosts outlive SCSI devices. Remove the reference counting code from scsi_sysfs.c that became superfluous because SCSI hosts now outlive SCSI devices. Link: https://lore.kernel.org/r/20220728221851.1822295-4-bvanassche@acm.org Cc: Christoph Hellwig <hch@lst.de> Cc: Ming Lei <ming.lei@redhat.com> Cc: Mike Christie <michael.christie@oracle.com> Cc: Hannes Reinecke <hare@suse.de> Cc: John Garry <john.garry@huawei.com> Reviewed-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> [ bvanassche: Extracted this patch from a larger patch ] Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
-rw-r--r--drivers/scsi/scsi.c9
-rw-r--r--drivers/scsi/scsi_sysfs.c9
2 files changed, 6 insertions, 12 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index c59eac7a32f2..086ec5b5862d 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -586,10 +586,13 @@ EXPORT_SYMBOL(scsi_device_get);
*/
void scsi_device_put(struct scsi_device *sdev)
{
- struct module *mod = sdev->host->hostt->module;
-
+ /*
+ * Decreasing the module reference count before the device reference
+ * count is safe since scsi_remove_host() only returns after all
+ * devices have been removed.
+ */
+ module_put(sdev->host->hostt->module);
put_device(&sdev->sdev_gendev);
- module_put(mod);
}
EXPORT_SYMBOL(scsi_device_put);
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 1bc9c26fe1d4..213ebc88f76a 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -452,9 +452,6 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
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;
-
- mod = sdev->host->hostt->module;
scsi_dh_release_device(sdev);
@@ -521,17 +518,11 @@ 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);
}