From: Anil Veerabhadrappa Date: Tue, 23 Jun 2009 21:07:40 +0000 (-0700) Subject: [SCSI] bnx2i: convert bnx2i_dev_lock to mutex X-Git-Tag: v2.6.32-rc1~689^2~203 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3be924fb1d7be90c3ae6aa30ca42e9aa5d75efaf;p=profile%2Fivi%2Fkernel-x86-ivi.git [SCSI] bnx2i: convert bnx2i_dev_lock to mutex convert bnx2i_dev_lock to type mutex from rwlock_t because cnic->register_device() can sleep for various reasons including memory allocation, waiting for ISCSI_INIT completion and while acquiring mutex lock, cnic_lock. Signed-off-by: Michael Chan Signed-off-by: Anil Veerabhadrappa Reviewed-by: Mike Christie Signed-off-by: James Bottomley Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/bnx2i/bnx2i_init.c b/drivers/scsi/bnx2i/bnx2i_init.c index 2aeeeee..fd78540 100644 --- a/drivers/scsi/bnx2i/bnx2i_init.c +++ b/drivers/scsi/bnx2i/bnx2i_init.c @@ -17,8 +17,8 @@ static struct list_head adapter_list = LIST_HEAD_INIT(adapter_list); static u32 adapter_count; #define DRV_MODULE_NAME "bnx2i" -#define DRV_MODULE_VERSION "2.0.1d" -#define DRV_MODULE_RELDATE "Mar 25, 2009" +#define DRV_MODULE_VERSION "2.0.1e" +#define DRV_MODULE_RELDATE "June 22, 2009" static char version[] __devinitdata = "Broadcom NetXtreme II iSCSI Driver " DRV_MODULE_NAME \ @@ -30,7 +30,7 @@ MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709 iSCSI Driver"); MODULE_LICENSE("GPL"); MODULE_VERSION(DRV_MODULE_VERSION); -static DEFINE_RWLOCK(bnx2i_dev_lock); +static DEFINE_MUTEX(bnx2i_dev_lock); unsigned int event_coal_div = 1; module_param(event_coal_div, int, 0664); @@ -99,14 +99,14 @@ struct bnx2i_hba *get_adapter_list_head(void) if (!adapter_count) goto hba_not_found; - read_lock(&bnx2i_dev_lock); + mutex_lock(&bnx2i_dev_lock); list_for_each_entry(tmp_hba, &adapter_list, link) { if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) { hba = tmp_hba; break; } } - read_unlock(&bnx2i_dev_lock); + mutex_unlock(&bnx2i_dev_lock); hba_not_found: return hba; } @@ -121,14 +121,14 @@ struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic) { struct bnx2i_hba *hba, *temp; - read_lock(&bnx2i_dev_lock); + mutex_lock(&bnx2i_dev_lock); list_for_each_entry_safe(hba, temp, &adapter_list, link) { if (hba->cnic == cnic) { - read_unlock(&bnx2i_dev_lock); + mutex_unlock(&bnx2i_dev_lock); return hba; } } - read_unlock(&bnx2i_dev_lock); + mutex_unlock(&bnx2i_dev_lock); return NULL; } @@ -206,10 +206,10 @@ void bnx2i_reg_dev_all(void) { struct bnx2i_hba *hba, *temp; - read_lock(&bnx2i_dev_lock); + mutex_lock(&bnx2i_dev_lock); list_for_each_entry_safe(hba, temp, &adapter_list, link) bnx2i_register_device(hba); - read_unlock(&bnx2i_dev_lock); + mutex_unlock(&bnx2i_dev_lock); } @@ -246,10 +246,10 @@ void bnx2i_unreg_dev_all(void) { struct bnx2i_hba *hba, *temp; - read_lock(&bnx2i_dev_lock); + mutex_lock(&bnx2i_dev_lock); list_for_each_entry_safe(hba, temp, &adapter_list, link) bnx2i_unreg_one_device(hba); - read_unlock(&bnx2i_dev_lock); + mutex_unlock(&bnx2i_dev_lock); } @@ -258,19 +258,21 @@ void bnx2i_unreg_dev_all(void) * @hba: bnx2i adapter instance * @cnic: cnic device handle * - * Global resource lock and host adapter lock is held during critical sections - * below. This routine is called from cnic_register_driver() context and - * work horse thread which does majority of device specific initialization + * Global resource lock is held during critical sections below. This routine is + * called from either cnic_register_driver() or device hot plug context and + * and does majority of device specific initialization */ static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic) { int rc; - read_lock(&bnx2i_dev_lock); + mutex_lock(&bnx2i_dev_lock); rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba); if (!rc) { hba->age++; set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); + list_add_tail(&hba->link, &adapter_list); + adapter_count++; } else if (rc == -EBUSY) /* duplicate registration */ printk(KERN_ALERT "bnx2i, duplicate registration" "hba=%p, cnic=%p\n", hba, cnic); @@ -280,14 +282,8 @@ static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic) printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI); else printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc); - read_unlock(&bnx2i_dev_lock); - if (!rc) { - write_lock(&bnx2i_dev_lock); - list_add_tail(&hba->link, &adapter_list); - adapter_count++; - write_unlock(&bnx2i_dev_lock); - } + mutex_unlock(&bnx2i_dev_lock); return rc; } @@ -337,7 +333,7 @@ void bnx2i_ulp_exit(struct cnic_dev *dev) "found, dev 0x%p\n", dev); return; } - write_lock(&bnx2i_dev_lock); + mutex_lock(&bnx2i_dev_lock); list_del_init(&hba->link); adapter_count--; @@ -345,7 +341,7 @@ void bnx2i_ulp_exit(struct cnic_dev *dev) hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); } - write_unlock(&bnx2i_dev_lock); + mutex_unlock(&bnx2i_dev_lock); bnx2i_free_hba(hba); } @@ -367,6 +363,8 @@ static int __init bnx2i_mod_init(void) if (!is_power_of_2(sq_size)) sq_size = roundup_pow_of_two(sq_size); + mutex_init(&bnx2i_dev_lock); + bnx2i_scsi_xport_template = iscsi_register_transport(&bnx2i_iscsi_transport); if (!bnx2i_scsi_xport_template) { @@ -402,7 +400,7 @@ static void __exit bnx2i_mod_exit(void) { struct bnx2i_hba *hba; - write_lock(&bnx2i_dev_lock); + mutex_lock(&bnx2i_dev_lock); while (!list_empty(&adapter_list)) { hba = list_entry(adapter_list.next, struct bnx2i_hba, link); list_del(&hba->link); @@ -413,11 +411,9 @@ static void __exit bnx2i_mod_exit(void) clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); } - write_unlock(&bnx2i_dev_lock); bnx2i_free_hba(hba); - write_lock(&bnx2i_dev_lock); } - write_unlock(&bnx2i_dev_lock); + mutex_unlock(&bnx2i_dev_lock); iscsi_unregister_transport(&bnx2i_iscsi_transport); cnic_unregister_driver(CNIC_ULP_ISCSI);