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Fix regression in the /sys/class/infiniband/.../rate attribute -- old

Browse source 
kernels used to just return something, even if the underlying value was
 out-of-bounds, while 3.4-rc1 returned EINVAL to userspace.  This breaks
 some applications that check for the error, so go back to the old
 behavior.
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Merge tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband

Pull infiniband fixes from Roland Dreier:
 "Fix a regression in the /sys/class/infiniband/.../rate attribute --
  old kernels used to just return something, even if the underlying
  value was out-of-bounds, while 3.4-rc1 returned EINVAL to userspace.
  This breaks some applications that check for the error, so go back to
  the old behavior."

* tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
  IB/core: Don't return EINVAL from sysfs rate attribute for invalid speeds
  IB/mlx4: Don't return an invalid speed when a port is down
This commit is contained in:
Linus Torvalds 2012-04-11 13:24:52 -07:00
parent 70f33fa586 0559d8dc13
commit f549e088b8
2 changed files with 10 additions and 4 deletions
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9
drivers/infiniband/core/sysfs.c
View file

@ -179,7 +179,7 @@ static ssize_t rate_show(struct ib_port *p, struct port_attribute *unused,
{
struct ib_port_attr attr;
char *speed = "";
int rate = -1; /* in deci-Gb/sec */
int rate; /* in deci-Gb/sec */
ssize_t ret;
ret = ib_query_port(p->ibdev, p->port_num, &attr);
@ -187,9 +187,6 @@ static ssize_t rate_show(struct ib_port *p, struct port_attribute *unused,
return ret;
switch (attr.active_speed) {
case IB_SPEED_SDR:
rate = 25;
break;
case IB_SPEED_DDR:
speed = " DDR";
rate = 50;
@ -210,6 +207,10 @@ static ssize_t rate_show(struct ib_port *p, struct port_attribute *unused,
speed = " EDR";
rate = 250;
break;
case IB_SPEED_SDR:
default: /* default to SDR for invalid rates */
rate = 25;
break;
}
rate *= ib_width_enum_to_int(attr.active_width);

5
drivers/infiniband/hw/mlx4/main.c
View file

@ -253,6 +253,11 @@ static int ib_link_query_port(struct ib_device *ibdev, u8 port,
if (out_mad->data[15] & 0x1)
props->active_speed = IB_SPEED_FDR10;
}
/* Avoid wrong speed value returned by FW if the IB link is down. */
if (props->state == IB_PORT_DOWN)
props->active_speed = IB_SPEED_SDR;
out:
kfree(in_mad);
kfree(out_mad);