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[media] media/rc: fix oops on unloading module rc-core

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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>
This commit is contained in:
Konstantin Khlebnikov 2012-12-14 07:02:48 -03:00 committed by Mauro Carvalho Chehab
parent f7c3f5ce17
commit a4bb6f353e
2 changed files with 9 additions and 24 deletions
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17
drivers/media/rc/ir-raw.c
View file

@ -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;
@ -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 */
@ -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
drivers/media/rc/rc-core-priv.h
View file

@ -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