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path: root/drivers/scsi/scsi.c
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Diffstat (limited to 'drivers/scsi/scsi.c')
-rw-r--r--drivers/scsi/scsi.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index d07fb653f5dc..b1bf42b93fcc 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -782,7 +782,7 @@ void scsi_attach_vpd(struct scsi_device *sdev)
int vpd_len = SCSI_VPD_PG_LEN;
int pg80_supported = 0;
int pg83_supported = 0;
- unsigned char *vpd_buf;
+ unsigned char __rcu *vpd_buf, *orig_vpd_buf = NULL;
if (sdev->skip_vpd_pages)
return;
@@ -828,8 +828,16 @@ retry_pg80:
kfree(vpd_buf);
goto retry_pg80;
}
+ mutex_lock(&sdev->inquiry_mutex);
+ orig_vpd_buf = sdev->vpd_pg80;
sdev->vpd_pg80_len = result;
- sdev->vpd_pg80 = vpd_buf;
+ rcu_assign_pointer(sdev->vpd_pg80, vpd_buf);
+ mutex_unlock(&sdev->inquiry_mutex);
+ synchronize_rcu();
+ if (orig_vpd_buf) {
+ kfree(orig_vpd_buf);
+ orig_vpd_buf = NULL;
+ }
vpd_len = SCSI_VPD_PG_LEN;
}
@@ -849,8 +857,14 @@ retry_pg83:
kfree(vpd_buf);
goto retry_pg83;
}
+ mutex_lock(&sdev->inquiry_mutex);
+ orig_vpd_buf = sdev->vpd_pg83;
sdev->vpd_pg83_len = result;
- sdev->vpd_pg83 = vpd_buf;
+ rcu_assign_pointer(sdev->vpd_pg83, vpd_buf);
+ mutex_unlock(&sdev->inquiry_mutex);
+ synchronize_rcu();
+ if (orig_vpd_buf)
+ kfree(orig_vpd_buf);
}
}