Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel…

…/git/ieee1394/linux1394-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: ieee1394: sbp2: fix race condition in state change ieee1394: fix list corruption (reported at module removal) firewire: fw-sbp2: another iPod mini quirk entry ieee1394: sbp2: another iPod mini quirk entry
yi-yang · Dec 1, 2008 · 6a12141 · 6a12141
2 parents c07f62e + 2642b11
commit 6a12141
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Showing 4 changed files with 31 additions and 17 deletions.
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
@@ -370,6 +370,11 @@ static const struct {
 		.model			= 0x000021,
 		.workarounds		= SBP2_WORKAROUND_FIX_CAPACITY,
 	},
+	/* iPod mini */ {
+		.firmware_revision	= 0x0a2700,
+		.model			= 0x000022,
+		.workarounds		= SBP2_WORKAROUND_FIX_CAPACITY,
+	},
 	/* iPod mini */ {
 		.firmware_revision	= 0x0a2700,
 		.model			= 0x000023,

diff --git a/drivers/ieee1394/highlevel.c b/drivers/ieee1394/highlevel.c
@@ -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)

diff --git a/drivers/ieee1394/hosts.h b/drivers/ieee1394/hosts.h
@@ -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 {

diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
@@ -400,6 +400,11 @@ static const struct {
 		.model_id		= 0x000021,
 		.workarounds		= SBP2_WORKAROUND_FIX_CAPACITY,
 	},
+	/* iPod mini */ {
+		.firmware_revision	= 0x0a2700,
+		.model_id		= 0x000022,
+		.workarounds		= SBP2_WORKAROUND_FIX_CAPACITY,
+	},
 	/* iPod mini */ {
 		.firmware_revision	= 0x0a2700,
 		.model_id		= 0x000023,
@@ -890,12 +895,13 @@ static void sbp2_host_reset(struct hpsb_host *host)
 		return;
 
 	read_lock_irqsave(&sbp2_hi_logical_units_lock, flags);
+
 	list_for_each_entry(lu, &hi->logical_units, lu_list)
-		if (likely(atomic_read(&lu->state) !=
-			   SBP2LU_STATE_IN_SHUTDOWN)) {
-			atomic_set(&lu->state, SBP2LU_STATE_IN_RESET);
+		if (atomic_cmpxchg(&lu->state,
+				   SBP2LU_STATE_RUNNING, SBP2LU_STATE_IN_RESET)
+		    == SBP2LU_STATE_RUNNING)
 			scsi_block_requests(lu->shost);
-		}
+
 	read_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags);
 }