Commit e499081d authored Aug 22, 2019 by Logan Gunthorpe Committed by Bjorn Helgaas Sep 05, 2019

PCI: Force trailing new line to resource_alignment_param in sysfs

When 'pci=resource_alignment=' is specified on the command line, there is
no trailing new line.  Then, when it's read through the corresponding sysfs
attribute, there will be no newline and a cat command will not show
correctly in a shell. If the parameter is set through sysfs a new line will
be stored and it will 'cat' correctly.

To solve this, append a new line character in the show function if one does
not already exist.

Link: https://lore.kernel.org/r/20190822161013.5481-4-logang@deltatee.com


Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

parent 273b177c

drivers/pci/pci.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -6126,6 +6126,16 @@ static ssize_t resource_alignment_show(struct bus_type bus, char buf)
		count = snprintf(buf, PAGE_SIZE, "%s", resource_alignment_param);
		spin_unlock(&resource_alignment_lock);

		/*
		* When set by the command line, resource_alignment_param will not
		* have a trailing line feed, which is ugly. So conditionally add
		* it here.
		*/
		if (count >= 2 && buf[count - 2] != '\n' && count < PAGE_SIZE - 1) {
		buf[count - 1] = '\n';
		buf[count++] = 0;
		}

		return count;
		}