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scsi: hisi_sas: Modify the commit information for DSM method 

Make it clear that BIOS may modify some register settings.

Link: https://lore.kernel.org/r/1589552025-165012-3-git-send-email-john.garry@huawei.com
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Luo Jiaxing 2020-05-15 22:13:43 +08:00 committed by Martin K. Petersen
parent e16b9ed61e
commit 1e954d1f00
1 changed files with 6 additions and 2 deletions
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8
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
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@ -912,11 +912,15 @@ static int hw_init_v3_hw(struct hisi_hba *hisi_hba)
return -EINVAL; return -EINVAL;
} }
/* Switch over to MSI handling , from PCI AER default */ /*
* This DSM handles some hardware-related configurations:
* 1. Switch over to MSI error handling in kernel
* 2. BIOS *may* reset some register values through this method
*/
obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &guid, 0, obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &guid, 0,
DSM_FUNC_ERR_HANDLE_MSI, NULL); DSM_FUNC_ERR_HANDLE_MSI, NULL);
if (!obj) if (!obj)
dev_warn(dev, "Switch over to MSI handling failed\n"); dev_warn(dev, "can not find DSM method, ignore\n");
else else
ACPI_FREE(obj); ACPI_FREE(obj);