Messages in this thread | | | From | "remaper" <> | Subject | generic_make_request not locked | Date | Tue, 30 Apr 2013 13:39:20 +0800 |
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/* * We only want one ->make_request_fn to be active at a time, * else stack usage with stacked devices could be a problem. * So use current->bio_list to keep a list of requests * submited by a make_request_fn function. * current->bio_list is also used as a flag to say if * generic_make_request is currently active in this task or not. * If it is NULL, then no make_request is active. If it is non-NULL, * then a make_request is active, and new requests should be added * at the tail */ void generic_make_request(struct bio *bio) { ... if (current->bio_list) { /* make_request is active */ bio_list_add(current->bio_list, bio); return; } ... }
current->bio_list is a global variable, and generic_make_request would run on multithread environment, so, i don't understand why here( bio_list_add ) not lock? thx everybody. | |