Skip to content

Commit

Permalink
[media] media/rc: fix oops on unloading module rc-core
Browse files Browse the repository at this point in the history
During modiles initialization rc-core schedules work which calls
request_module() several times to load ir-*-decoder modules, but
it does not wait or cancel this work on module unloading.
rc-core should use request_module_nowait() instead, because it
anyway cannot load modules synchronously or cancel/wait pending
work on unloading, because this leads to deadlock on modules_mutex
between several "modprobe" processes.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
  • Loading branch information
Konstantin Khlebnikov authored and Mauro Carvalho Chehab committed Dec 27, 2012
1 parent f7c3f5c commit a4bb6f3
Show file tree
Hide file tree
Showing 2 changed files with 9 additions and 24 deletions.
17 changes: 1 addition & 16 deletions drivers/media/rc/ir-raw.c
Original file line number Diff line number Diff line change
Expand Up @@ -31,11 +31,6 @@ static DEFINE_MUTEX(ir_raw_handler_lock);
static LIST_HEAD(ir_raw_handler_list);
static u64 available_protocols;

#ifdef MODULE
/* Used to load the decoders */
static struct work_struct wq_load;
#endif

static int ir_raw_event_thread(void *data)
{
struct ir_raw_event ev;
Expand Down Expand Up @@ -347,8 +342,7 @@ void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler)
}
EXPORT_SYMBOL(ir_raw_handler_unregister);

#ifdef MODULE
static void init_decoders(struct work_struct *work)
void ir_raw_init(void)
{
/* Load the decoder modules */

Expand All @@ -365,12 +359,3 @@ static void init_decoders(struct work_struct *work)
it is needed to change the CONFIG_MODULE test at rc-core.h
*/
}
#endif

void ir_raw_init(void)
{
#ifdef MODULE
INIT_WORK(&wq_load, init_decoders);
schedule_work(&wq_load);
#endif
}
16 changes: 8 additions & 8 deletions drivers/media/rc/rc-core-priv.h
Original file line number Diff line number Diff line change
Expand Up @@ -165,56 +165,56 @@ void ir_raw_init(void);

/* from ir-nec-decoder.c */
#ifdef CONFIG_IR_NEC_DECODER_MODULE
#define load_nec_decode() request_module("ir-nec-decoder")
#define load_nec_decode() request_module_nowait("ir-nec-decoder")
#else
static inline void load_nec_decode(void) { }
#endif

/* from ir-rc5-decoder.c */
#ifdef CONFIG_IR_RC5_DECODER_MODULE
#define load_rc5_decode() request_module("ir-rc5-decoder")
#define load_rc5_decode() request_module_nowait("ir-rc5-decoder")
#else
static inline void load_rc5_decode(void) { }
#endif

/* from ir-rc6-decoder.c */
#ifdef CONFIG_IR_RC6_DECODER_MODULE
#define load_rc6_decode() request_module("ir-rc6-decoder")
#define load_rc6_decode() request_module_nowait("ir-rc6-decoder")
#else
static inline void load_rc6_decode(void) { }
#endif

/* from ir-jvc-decoder.c */
#ifdef CONFIG_IR_JVC_DECODER_MODULE
#define load_jvc_decode() request_module("ir-jvc-decoder")
#define load_jvc_decode() request_module_nowait("ir-jvc-decoder")
#else
static inline void load_jvc_decode(void) { }
#endif

/* from ir-sony-decoder.c */
#ifdef CONFIG_IR_SONY_DECODER_MODULE
#define load_sony_decode() request_module("ir-sony-decoder")
#define load_sony_decode() request_module_nowait("ir-sony-decoder")
#else
static inline void load_sony_decode(void) { }
#endif

/* from ir-sanyo-decoder.c */
#ifdef CONFIG_IR_SANYO_DECODER_MODULE
#define load_sanyo_decode() request_module("ir-sanyo-decoder")
#define load_sanyo_decode() request_module_nowait("ir-sanyo-decoder")
#else
static inline void load_sanyo_decode(void) { }
#endif

/* from ir-mce_kbd-decoder.c */
#ifdef CONFIG_IR_MCE_KBD_DECODER_MODULE
#define load_mce_kbd_decode() request_module("ir-mce_kbd-decoder")
#define load_mce_kbd_decode() request_module_nowait("ir-mce_kbd-decoder")
#else
static inline void load_mce_kbd_decode(void) { }
#endif

/* from ir-lirc-codec.c */
#ifdef CONFIG_IR_LIRC_CODEC_MODULE
#define load_lirc_codec() request_module("ir-lirc-codec")
#define load_lirc_codec() request_module_nowait("ir-lirc-codec")
#else
static inline void load_lirc_codec(void) { }
#endif
Expand Down

0 comments on commit a4bb6f3

Please sign in to comment.