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Date: Sun, 7 Jun 2009 15:28:04 +0200 From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com> To: Borislav Petkov <petkovbb@...glemail.com> Cc: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] ide-tape: fix proc warning On Sunday 07 June 2009 11:20:54 Borislav Petkov wrote: > Hi, > > this is yet another ide-tape fix against ide-2.6.git/for-next. > > -- > From: Borislav Petkov <petkovbb@...il.com> > Date: Sun, 7 Jun 2009 11:05:53 +0200 > Subject: [PATCH] ide-tape: fix proc warning > > When accessing ide-tape over the chrdev interface, I get > > [ 278.147906] ------------[ cut here ]------------ > [ 278.152685] WARNING: at fs/proc/generic.c:847 remove_proc_entry+0x199/0x1b8() > [ 278.160070] Hardware name: P4I45PE 1.00 > [ 278.160076] remove_proc_entry: removing non-empty directory 'ide0/hdb', leaking at least 'name' > [ 278.160080] Modules linked in: rtc intel_agp pcspkr thermal processor thermal_sys parport_pc parport agpgart button > [ 278.160100] Pid: 2312, comm: mt Not tainted 2.6.30-rc2 #3 > [ 278.160105] Call Trace: > [ 278.160117] [<c012141d>] warn_slowpath+0x71/0xa0 > [ 278.160126] [<c035f219>] ? _spin_unlock_irqrestore+0x29/0x2c > [ 278.160132] [<c011c686>] ? try_to_wake_up+0x1b6/0x1c0 > [ 278.160141] [<c011c69b>] ? default_wake_function+0xb/0xd > [ 278.160149] [<c0177ead>] ? pollwake+0x4a/0x55 > [ 278.160156] [<c035f240>] ? _spin_unlock+0x24/0x26 > [ 278.160163] [<c0165d38>] ? add_partial+0x44/0x49 > [ 278.160169] [<c01669e8>] ? __slab_free+0xba/0x29c > [ 278.160177] [<c01a13d8>] ? sysfs_delete_inode+0x0/0x3c > [ 278.160184] [<c019ca92>] remove_proc_entry+0x199/0x1b8 > [ 278.160191] [<c01a297e>] ? remove_dir+0x27/0x2e > [ 278.160199] [<c025f3ab>] ide_proc_unregister_device+0x40/0x4c > [ 278.160207] [<c02599cd>] drive_release_dev+0x14/0x47 > [ 278.160214] [<c0250538>] device_release+0x35/0x5a > [ 278.160221] [<c01f8bed>] kobject_release+0x40/0x50 > [ 278.160226] [<c01f8bad>] ? kobject_release+0x0/0x50 > [ 278.160232] [<c01f96ac>] kref_put+0x3c/0x4a > [ 278.160238] [<c01f8b29>] kobject_put+0x37/0x3c > [ 278.160243] [<c025020c>] put_device+0xf/0x11 > [ 278.160249] [<c025789f>] ide_device_put+0x2d/0x30 > [ 278.160255] [<c02658da>] ide_tape_put+0x24/0x32 > [ 278.160261] [<c0266e0c>] idetape_chrdev_release+0x17f/0x18e > [ 278.160269] [<c016c4f5>] __fput+0xca/0x175 > [ 278.160275] [<c016c5b9>] fput+0x19/0x1b > [ 278.160280] [<c0169d19>] filp_close+0x51/0x5b > [ 278.160286] [<c0169d96>] sys_close+0x73/0xad > [ 278.160293] [<c0102a61>] syscall_call+0x7/0xb > [ 278.160298] ---[ end trace f16d907ea1f89336 ]--- > > because it tries to free its proc entry in drive_release_dev() > in the call chain resulting from ide_tape_put() but it chokes on > /proc/ide/ide[01]/hd?/name which is added during driver registration and > should go only at driver removal time. > > Add/remove those proc entries everytime the device is accessed. This looks more like broken ide-tape refcounting for chrdev interface than mismatch of /proc entries registration time (especially since other device drivers are not having the above problem).. Please see ide_tape_chrdev_get() -- it misses ide_device_get() call [present in ide_tape_get()] which can result in premature release of IDE device during ide_tape_put() call. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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