From: Jing Huang <huangj@brocade.com>
Date: Fri, 19 Mar 2010 18:07:09 +0000 (-0700)
Subject: [SCSI] bfa: protect idr using bfad_mutex
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=42b426ecb453cf49c3d16cf1d7a5e5d8cab9869d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

[SCSI] bfa: protect idr using bfad_mutex

idr is a global resource, protect it with global bfad_mutex.

Signed-off-by: Jing Huang <huangj@brocade.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
---

diff --git a/drivers/scsi/bfa/bfad.c b/drivers/scsi/bfa/bfad.c
index 0baeabadb5b2..d4fc4287ebd3 100644
--- a/drivers/scsi/bfa/bfad.c
+++ b/drivers/scsi/bfa/bfad.c
@@ -33,7 +33,7 @@
 #include <fcb/bfa_fcb.h>
 
 BFA_TRC_FILE(LDRV, BFAD);
-static DEFINE_MUTEX(bfad_mutex);
+DEFINE_MUTEX(bfad_mutex);
 LIST_HEAD(bfad_list);
 static int      bfad_inst;
 int bfad_supported_fc4s;
diff --git a/drivers/scsi/bfa/bfad_drv.h b/drivers/scsi/bfa/bfad_drv.h
index 0639aedcb610..6c920c1b53a4 100644
--- a/drivers/scsi/bfa/bfad_drv.h
+++ b/drivers/scsi/bfa/bfad_drv.h
@@ -293,5 +293,6 @@ extern struct list_head bfad_list;
 extern int bfa_lun_queue_depth;
 extern int bfad_supported_fc4s;
 extern int bfa_linkup_delay;
+extern struct mutex bfad_mutex;
 
 #endif /* __BFAD_DRV_H__ */
diff --git a/drivers/scsi/bfa/bfad_im.c b/drivers/scsi/bfa/bfad_im.c
index f263891b8cc6..5b7cf539e50b 100644
--- a/drivers/scsi/bfa/bfad_im.c
+++ b/drivers/scsi/bfa/bfad_im.c
@@ -518,7 +518,9 @@ bfad_im_scsi_host_alloc(struct bfad_s *bfad, struct bfad_im_port_s *im_port,
 {
 	int error = 1;
 
+	mutex_lock(&bfad_mutex);
 	if (!idr_pre_get(&bfad_im_port_index, GFP_KERNEL)) {
+		mutex_unlock(&bfad_mutex);
 		printk(KERN_WARNING "idr_pre_get failure\n");
 		goto out;
 	}
@@ -526,10 +528,13 @@ bfad_im_scsi_host_alloc(struct bfad_s *bfad, struct bfad_im_port_s *im_port,
 	error = idr_get_new(&bfad_im_port_index, im_port,
 					 &im_port->idr_id);
 	if (error) {
+		mutex_unlock(&bfad_mutex);
 		printk(KERN_WARNING "idr_get_new failure\n");
 		goto out;
 	}
 
+	mutex_unlock(&bfad_mutex);
+
 	im_port->shost = bfad_os_scsi_host_alloc(im_port, bfad);
 	if (!im_port->shost) {
 		error = 1;
@@ -563,7 +568,9 @@ bfad_im_scsi_host_alloc(struct bfad_s *bfad, struct bfad_im_port_s *im_port,
 out_fc_rel:
 	scsi_host_put(im_port->shost);
 out_free_idr:
+	mutex_lock(&bfad_mutex);
 	idr_remove(&bfad_im_port_index, im_port->idr_id);
+	mutex_unlock(&bfad_mutex);
 out:
 	return error;
 }
@@ -571,8 +578,6 @@ out:
 void
 bfad_im_scsi_host_free(struct bfad_s *bfad, struct bfad_im_port_s *im_port)
 {
-	unsigned long flags;
-
 	bfa_trc(bfad, bfad->inst_no);
 	bfa_log(bfad->logmod, BFA_LOG_LINUX_SCSI_HOST_FREE,
 			im_port->shost->host_no);
@@ -582,9 +587,9 @@ bfad_im_scsi_host_free(struct bfad_s *bfad, struct bfad_im_port_s *im_port)
 	scsi_remove_host(im_port->shost);
 	scsi_host_put(im_port->shost);
 
-	spin_lock_irqsave(&bfad->bfad_lock, flags);
+	mutex_lock(&bfad_mutex);
 	idr_remove(&bfad_im_port_index, im_port->idr_id);
-	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+	mutex_unlock(&bfad_mutex);
 }
 
 static void