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authorKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>2008-02-21 15:24:16 +0900
committerGreg Kroah-Hartman <gregkh@suse.de>2008-02-21 15:34:39 -0800
commit79df4c60c5b24ebc90f591d5991b22782813fcfe (patch)
treec8ff2e37d969c3961c64340eda242c6a2cc74ef5 /drivers/pci/proc.c
parent13d36c248379ca09c269f5dbed6dce1e3a326a48 (diff)
downloadlwn-79df4c60c5b24ebc90f591d5991b22782813fcfe.tar.gz
lwn-79df4c60c5b24ebc90f591d5991b22782813fcfe.zip
PCI: Fix wrong reference counter check for proc_dir_entry
Fix wrong counter check for proc_dir_entry in pci_proc_detach_device(). The pci_proc_detach_device() returns with -EBUSY before calling remove_proc_entry() if the reference counter of proc_dir_entry is not 0. But this check is wrong and pci_proc_detach_device() always fails because the reference counter of proc_dir_entry is initialized with 1 at creating time and decremented in remove_proc_entry(). This bug cause strange behaviour as followings: - Accessing /proc/bus/pci/XXXX/YY file after hot-removing pci adapter card causes kernel panic. - Repeating hot-add/hot-remove of pci adapter card increases files with the same name under /proc/bus/pci/XXXX/ directory. For example: # pwd /proc/bus/pci/0002:09 # ls 01.0 # for i in `seq 5` > do > echo 0 > /sys/bus/pci/slots/0009_0032/power > echo 1 > /sys/bus/pci/slots/0009_0032/power > done # ls 01.0 01.0 01.0 01.0 01.0 01.0 The pci_proc_detach_device() should check if the reference counter is not larger than 1 instead. Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/proc.c')
-rw-r--r--drivers/pci/proc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index 68aeeb7206de..ef18fcd641e2 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -422,7 +422,7 @@ int pci_proc_detach_device(struct pci_dev *dev)
struct proc_dir_entry *e;
if ((e = dev->procent)) {
- if (atomic_read(&e->count))
+ if (atomic_read(&e->count) > 1)
return -EBUSY;
remove_proc_entry(e->name, dev->bus->procdir);
dev->procent = NULL;