Commit a153e5e1 authored by Krzysztof Wilczyński's avatar Krzysztof Wilczyński Committed by Bjorn Helgaas
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PCI: Add schedule point in proc_bus_pci_read() 

PCI configuration space reads from /proc/bus/pci can often take several
milliseconds to complete.

Add a schedule point in proc_bus_pci_read() to reduce the maximum latency.

A similar change was made for sysfs by 2ce02a86 ("PCI: Add schedule
point in pci_read_config()").

Link: https://lore.kernel.org/r/20200824052025.48362-1-benbjiang@tencent.com
Link: https://lore.kernel.org/r/20210815150824.96773-1-kw@linux.com


Signed-off-by: default avatarKrzysztof Wilczyński <kw@linux.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 1901f8c9

drivers/pci/proc.c

+1 −0
Original line number Diff line number Diff line
@@ -83,6 +83,7 @@ static ssize_t proc_bus_pci_read(struct file *file, char __user *buf, 
		buf += 4;

		pos += 4;

		cnt -= 4;

		cond_resched();

	}



	if (cnt >= 2) {