[SCSI] bfa: Serialize the IOC hw semaphore unlock logic.

Made changes to ensure only the function that comes first will execute
the IOC hw semaphore unlock logic.
Used IOC init sem register to serialize execution of the unlock logic.

Signed-off-by: Krishna Gudipati <kgudipat@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/bfa/bfa_ioc.c

@@ -97,7 +97,6 @@ static void bfa_ioc_debug_save_ftrc(struct bfa_ioc_s *ioc);
 static void bfa_ioc_fail_notify(struct bfa_ioc_s *ioc);
 static void bfa_ioc_pf_fwmismatch(struct bfa_ioc_s *ioc);
 
-
 /*
  * IOC state machine definitions/declarations
  */
@@ -738,26 +737,60 @@ static void
 bfa_iocpf_sm_fwcheck_entry(struct bfa_iocpf_s *iocpf)
 {
 	struct bfi_ioc_image_hdr_s	fwhdr;
-	u32	fwstate = readl(iocpf->ioc->ioc_regs.ioc_fwstate);
+	u32	r32, fwstate, pgnum, pgoff, loff = 0;
+	int	i;
+
+	/*
+	 * Spin on init semaphore to serialize.
+	 */
+	r32 = readl(iocpf->ioc->ioc_regs.ioc_init_sem_reg);
+	while (r32 & 0x1) {
+		udelay(20);
+		r32 = readl(iocpf->ioc->ioc_regs.ioc_init_sem_reg);
+	}
 
 	/* h/w sem init */
-	if (fwstate == BFI_IOC_UNINIT)
+	fwstate = readl(iocpf->ioc->ioc_regs.ioc_fwstate);
+	if (fwstate == BFI_IOC_UNINIT) {
+		writel(1, iocpf->ioc->ioc_regs.ioc_init_sem_reg);
 		goto sem_get;
+	}
 
 	bfa_ioc_fwver_get(iocpf->ioc, &fwhdr);
 
-	if (swab32(fwhdr.exec) == BFI_FWBOOT_TYPE_NORMAL)
+	if (swab32(fwhdr.exec) == BFI_FWBOOT_TYPE_NORMAL) {
+		writel(1, iocpf->ioc->ioc_regs.ioc_init_sem_reg);
 		goto sem_get;
+	}
+
+	/*
+	 * Clear fwver hdr
+	 */
+	pgnum = PSS_SMEM_PGNUM(iocpf->ioc->ioc_regs.smem_pg0, loff);
+	pgoff = PSS_SMEM_PGOFF(loff);
+	writel(pgnum, iocpf->ioc->ioc_regs.host_page_num_fn);
+
+	for (i = 0; i < sizeof(struct bfi_ioc_image_hdr_s) / sizeof(u32); i++) {
+		bfa_mem_write(iocpf->ioc->ioc_regs.smem_page_start, loff, 0);
+		loff += sizeof(u32);
+	}
 
 	bfa_trc(iocpf->ioc, fwstate);
-	bfa_trc(iocpf->ioc, fwhdr.exec);
+	bfa_trc(iocpf->ioc, swab32(fwhdr.exec));
 	writel(BFI_IOC_UNINIT, iocpf->ioc->ioc_regs.ioc_fwstate);
+	writel(BFI_IOC_UNINIT, iocpf->ioc->ioc_regs.alt_ioc_fwstate);
 
 	/*
-	 * Try to lock and then unlock the semaphore.
+	 * Unlock the hw semaphore. Should be here only once per boot.
 	 */
 	readl(iocpf->ioc->ioc_regs.ioc_sem_reg);
 	writel(1, iocpf->ioc->ioc_regs.ioc_sem_reg);
+
+	/*
+	 * unlock init semaphore.
+	 */
+	writel(1, iocpf->ioc->ioc_regs.ioc_init_sem_reg);
+
 sem_get:
 	bfa_ioc_hw_sem_get(iocpf->ioc);
 }
@@ -1707,11 +1740,6 @@ bfa_ioc_download_fw(struct bfa_ioc_s *ioc, u32 boot_type,
 	u32 i;
 	u32 asicmode;
 
-	/*
-	 * Initialize LMEM first before code download
-	 */
-	bfa_ioc_lmem_init(ioc);
-
 	bfa_trc(ioc, bfa_cb_image_get_size(bfa_ioc_asic_gen(ioc)));
 	fwimg = bfa_cb_image_get_chunk(bfa_ioc_asic_gen(ioc), chunkno);
 
@@ -1999,6 +2027,12 @@ bfa_ioc_pll_init(struct bfa_ioc_s *ioc)
 	bfa_ioc_pll_init_asic(ioc);
 
 	ioc->pllinit = BFA_TRUE;
+
+	/*
+	 * Initialize LMEM
+	 */
+	bfa_ioc_lmem_init(ioc);
+
 	/*
 	 *  release semaphore.
 	 */
@@ -4772,7 +4806,7 @@ diag_ledtest_send(struct bfa_diag_s *diag, struct bfa_diag_ledtest_s *ledtest)
 }
 
 static void
-diag_ledtest_comp(struct bfa_diag_s *diag, struct bfi_diag_ledtest_rsp_s * msg)
+diag_ledtest_comp(struct bfa_diag_s *diag, struct bfi_diag_ledtest_rsp_s *msg)
 {
 	bfa_trc(diag, diag->ledtest.lock);
 	diag->ledtest.lock = BFA_FALSE;