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.
Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
---
drivers/pci/pci.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 3e71e161f18b..99d130ac6b96 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -6090,6 +6090,16 @@ 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;
}
--
2.20.1
