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PCI: Force trailing new line to resource_alignment_param in sysfs

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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>
This commit is contained in:
Logan Gunthorpe 2019-08-22 10:10:13 -06:00 committed by Bjorn Helgaas
parent 273b177cac
commit e499081da1
1 changed files with 10 additions and 0 deletions
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10
drivers/pci/pci.c
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@ -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;
}