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Subject[PATCH v2 04/11] skd: register block device only if some devices are present
Date
Register block device in skd_pci_probe() instead of in skd_init() so it
is registered only if some devices are present (currently it is always
registered when the driver is loaded). Please note that this change
depends on the fact that register_blkdev(0, ...) never returns 0.

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
drivers/block/skd_main.c | 33 ++++++++++++---------------------
1 file changed, 12 insertions(+), 21 deletions(-)

diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c
index 99d5d12..9ff34be 100644
--- a/drivers/block/skd_main.c
+++ b/drivers/block/skd_main.c
@@ -4899,6 +4899,14 @@ static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
}
}

+ if (!skd_major) {
+ rc = register_blkdev(0, DRV_NAME);
+ if (rc < 0)
+ goto err_out_regions;
+ BUG_ON(!rc);
+ skd_major = rc;
+ }
+
skdev = skd_construct(pdev);
if (skdev == NULL) {
rc = -ENOMEM;
@@ -5396,8 +5404,6 @@ static void skd_log_skreq(struct skd_device *skdev,

static int __init skd_init(void)
{
- int rc = -ENOMEM;
-
pr_info(PFX " v%s-b%s loaded\n", DRV_VERSION, DRV_BUILD_ID);

switch (skd_isr_type) {
@@ -5448,24 +5454,7 @@ static int __init skd_init(void)
skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT;
}

- /* Obtain major device number. */
- rc = register_blkdev(0, DRV_NAME);
- if (rc < 0)
- goto err_register_blkdev;
-
- skd_major = rc;
-
- rc = pci_register_driver(&skd_driver);
- if (rc < 0)
- goto err_pci_register_driver;
-
- return rc;
-
-err_pci_register_driver:
- unregister_blkdev(skd_major, DRV_NAME);
-
-err_register_blkdev:
- return rc;
+ return pci_register_driver(&skd_driver);
}

static void __exit skd_exit(void)
@@ -5473,7 +5462,9 @@ static void __exit skd_exit(void)
pr_info(PFX " v%s-b%s unloading\n", DRV_VERSION, DRV_BUILD_ID);

pci_unregister_driver(&skd_driver);
- unregister_blkdev(skd_major, DRV_NAME);
+
+ if (skd_major)
+ unregister_blkdev(skd_major, DRV_NAME);
}

module_init(skd_init);
--
1.8.2.3


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