add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/pci/vc.c
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@@ -13,6 +13,8 @@
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 #include <linux/pci_regs.h>
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 #include <linux/types.h>
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+#include "pci.h"
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+
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 /**
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  * pci_vc_save_restore_dwords - Save or restore a series of dwords
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  * @dev: device
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@@ -105,7 +107,7 @@
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 	struct pci_dev *link = NULL;
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 	/* Enable VCs from the downstream device */
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-	if (!dev->has_secondary_link)
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+	if (!pci_is_pcie(dev) || !pcie_downstream_port(dev))
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 		return;
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 	ctrl_pos = pos + PCI_VC_RES_CTRL + (res * PCI_CAP_VC_PER_VC_SIZEOF);
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@@ -170,7 +172,6 @@
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  * @dev: device
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  * @pos: starting position of VC capability (VC/VC9/MFVC)
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  * @save_state: buffer for save/restore
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- * @name: for error message
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  * @save: if provided a buffer, this indicates what to do with it
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  *
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  * Walking Virtual Channel config space to size, save, or restore it
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@@ -409,7 +410,6 @@
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  * For each type of VC capability, VC/VC9/MFVC, find the capability, size
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  * it, and allocate a buffer for save/restore.
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  */
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-
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 void pci_allocate_vc_save_buffers(struct pci_dev *dev)
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 {
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 	int i;