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Commit e47c1feb authored by Stefan Richter's avatar Stefan Richter
Browse files

ieee1394: fix list corruption (reported at module removal) 

If there is more than one FireWire controller present, dummy_zero_addr
and dummy_max_addr were added multiple times to different lists, thus
corrupting the lists.  Fix this by allocating them dynamically per host
instead of just once globally.

(Perhaps a better address space allocation algorithm could rid us of the
two dummy address spaces.)

Fixes http://bugzilla.kernel.org/show_bug.cgi?id=10129

 .

Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent 031bb27c

drivers/ieee1394/highlevel.c

+12 −13
Original line number Diff line number Diff line
@@ -46,10 +46,6 @@ static DEFINE_RWLOCK(hl_irqs_lock); 


static DEFINE_RWLOCK(addr_space_lock);



/* addr_space list will have zero and max already included as bounds */

static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };

static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;





static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,

					    struct hpsb_host *host)
@@ -481,20 +477,23 @@ int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host, 
	return retval;

}



static struct hpsb_address_ops dummy_ops;



/* dummy address spaces as lower and upper bounds of the host's a.s. list */

static void init_hpsb_highlevel(struct hpsb_host *host)

{

	INIT_LIST_HEAD(&dummy_zero_addr.host_list);

	INIT_LIST_HEAD(&dummy_zero_addr.hl_list);

	INIT_LIST_HEAD(&dummy_max_addr.host_list);

	INIT_LIST_HEAD(&dummy_max_addr.hl_list);

	INIT_LIST_HEAD(&host->dummy_zero_addr.host_list);

	INIT_LIST_HEAD(&host->dummy_zero_addr.hl_list);

	INIT_LIST_HEAD(&host->dummy_max_addr.host_list);

	INIT_LIST_HEAD(&host->dummy_max_addr.hl_list);



	dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;

	host->dummy_zero_addr.op = host->dummy_max_addr.op = &dummy_ops;



	dummy_zero_addr.start = dummy_zero_addr.end = 0;

	dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;

	host->dummy_zero_addr.start = host->dummy_zero_addr.end = 0;

	host->dummy_max_addr.start = host->dummy_max_addr.end = ((u64) 1) << 48;



	list_add_tail(&dummy_zero_addr.host_list, &host->addr_space);

	list_add_tail(&dummy_max_addr.host_list, &host->addr_space);

	list_add_tail(&host->dummy_zero_addr.host_list, &host->addr_space);

	list_add_tail(&host->dummy_max_addr.host_list, &host->addr_space);

}



void highlevel_add_host(struct hpsb_host *host)

drivers/ieee1394/hosts.h

+4 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ struct module; 


#include "ieee1394_types.h"

#include "csr.h"

#include "highlevel.h"



struct hpsb_packet;

struct hpsb_iso;
@@ -72,6 +73,9 @@ struct hpsb_host { 
	struct { DECLARE_BITMAP(map, 64); } tl_pool[ALL_NODES];



	struct csr_control csr;



	struct hpsb_address_serve dummy_zero_addr;

	struct hpsb_address_serve dummy_max_addr;

};



enum devctl_cmd {