[PATCH 3/8] block/floppy.c: handle blk_register_region() return value

Vishnu Pratap Singh
2015-11-09T03:17:35Z

This patch handles blk_register_region() return value.
Earlier blk_register_region() function doesn't handle error
cases, now it is added, so the callers of this function
should also handle it.

Verfied on X86 based ubuntu machine.
This patch depends on [PATCH 1/8] block/genhd.c: Add error handling

Signed-off-by: Vishnu Pratap Singh <vishnu.ps@samsung.com>
---
drivers/block/floppy.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 331363e..50802a6 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4219,8 +4219,10 @@ static int __init do_floppy_init(void)
if (err)
goto out_unreg_blkdev;

- blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
+ err = blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
floppy_find, NULL, NULL);
+ if (err)
+ goto out_unreg_region;

for (i = 0; i < 256; i++)
if (ITYPE(i))
@@ -4250,7 +4252,7 @@ static int __init do_floppy_init(void)
if (fdc_state[0].address == -1) {
cancel_delayed_work(&fd_timeout);
err = -ENODEV;
- goto out_unreg_region;
+ goto out_fdc_err;
}
#if N_FDC > 1
fdc_state[1].address = FDC2;
@@ -4261,7 +4263,7 @@ static int __init do_floppy_init(void)
if (err) {
cancel_delayed_work(&fd_timeout);
err = -EBUSY;
- goto out_unreg_region;
+ goto out_fdc_err;
}

/* initialise drive state */
@@ -4357,8 +4359,9 @@ out_remove_drives:
out_release_dma:
if (atomic_read(&usage_count))
floppy_release_irq_and_dma();
-out_unreg_region:
+out_fdc_err:
blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
+out_unreg_region:
platform_driver_unregister(&floppy_driver);
out_unreg_blkdev:
unregister_blkdev(FLOPPY_MAJOR, "fd");
--
1.9.1