lkml.org 
[lkml]   [2012]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] floppy: error handling fixes on floppy_init
Date
While looking at commit 3f9a5aa (floppy: Cleanup disk->queue before
caling put_disk() if add_disk() was never called) I noticed some
problems with the error handling and cleanup:

* missing cleanup (put_disk) if blk_init_queue fails, dr is decremented
first in the error handling loop
* if something fails in the add_disk loop, there is no cleanup of
previous iterations in the error handling.
* "if (disks[dr]->queue)" check is bogus, when reaching there for each
dr should exist an queue allocated, and it doesn't take into account
iterations where add_disk wasn't done, if failure happens in add_disk
loop.
* floppy_module_exit doesn't reset queue pointer if add_disk wasn't
done.

Later commit 4609dff (floppy: Fix a crash during rmmod) fixed the last
item, this change should handle the remaining problems on floppy_init.

Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Cc: stable@vger.kernel.org
---
drivers/block/floppy.c | 28 ++++++++++++++++++++--------
1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index a7d6347..25ac98b 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4127,6 +4127,7 @@ static int __init do_floppy_init(void)
{
int i, unit, drive;
int err, dr;
+ int registered = -1;

set_debugt();
interruptjiffies = resultjiffies = jiffies;
@@ -4153,6 +4154,7 @@ static int __init do_floppy_init(void)

disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock);
if (!disks[dr]->queue) {
+ put_disk(disks[dr]);
err = -ENOMEM;
goto out_destroy_workq;
}
@@ -4294,7 +4296,7 @@ static int __init do_floppy_init(void)

err = platform_device_register(&floppy_device[drive]);
if (err)
- goto out_release_dma;
+ goto out_remove_drives;

err = device_create_file(&floppy_device[drive].dev,
&dev_attr_cmos);
@@ -4312,6 +4314,16 @@ static int __init do_floppy_init(void)

out_unreg_platform_dev:
platform_device_unregister(&floppy_device[drive]);
+out_remove_drives:
+ registered = drive - 1;
+ while (drive--) {
+ if ((allowed_drive_mask & (1 << drive)) &&
+ fdc_state[FDC(drive)].version != FDC_NONE) {
+ del_gendisk(disks[drive]);
+ device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
+ platform_device_unregister(&floppy_device[drive]);
+ }
+ }
out_release_dma:
if (atomic_read(&usage_count))
floppy_release_irq_and_dma();
@@ -4325,14 +4337,14 @@ out_unreg_blkdev:
out_put_disk:
while (dr--) {
del_timer_sync(&motor_off_timer[dr]);
- if (disks[dr]->queue) {
- blk_cleanup_queue(disks[dr]->queue);
- /*
- * put_disk() is not paired with add_disk() and
- * will put queue reference one extra time. fix it.
- */
+ blk_cleanup_queue(disks[dr]->queue);
+ /*
+ * put_disk() may not be paired with add_disk() and
+ * will put queue reference one extra time. fix it.
+ */
+ if (dr > registered || !(allowed_drive_mask & (1 << dr)) ||
+ fdc_state[FDC(dr)].version == FDC_NONE)
disks[dr]->queue = NULL;
- }
put_disk(disks[dr]);
}
return err;
--
1.7.9.5


\
 
 \ /
  Last update: 2012-08-08 18:21    [W:0.036 / U:3.376 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site