scsi: lpfc: Fix ioremap issues in lpfc_sli4_pci_mem_setup()

stable inclusion
from stable-v5.10.180
commit bab8dc38b1a0a12bc064fc064269033bdcf5b88e
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7ZCDZ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.197&id=bab8dc38b1a0a12bc064fc064269033bdcf5b88e



--------------------------------

[ Upstream commit 91a0c0c1 ]

When if_type equals zero and pci_resource_start(pdev, PCI_64BIT_BAR4)
returns false, drbl_regs_memmap_p is not remapped. This passes a NULL
pointer to iounmap(), which can trigger a WARN() on certain arches.

When if_type equals six and pci_resource_start(pdev, PCI_64BIT_BAR4)
returns true, drbl_regs_memmap_p may has been remapped and
ctrl_regs_memmap_p is not remapped. This is a resource leak and passes a
NULL pointer to iounmap().

To fix these issues, we need to add null checks before iounmap(), and
change some goto labels.

Fixes: 1351e69f ("scsi: lpfc: Add push-to-adapter support to sli4")
Signed-off-by: Shuchang Li <lishuchang@hust.edu.cn>
Link: https://lore.kernel.org/r/20230404072133.1022-1-lishuchang@hust.edu.cn


Reviewed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yong Hu <yong.hu@windriver.com>